80 results on '"Gutiérrez-Marco, Juan Carlos"'
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2. New fossil assemblages from the Early Ordovician Fezouata Biota
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Saleh, Farid, Vaucher, Romain, Vidal, Muriel, Hariri, Khadija El, Laibl, Lukáš, Daley, Allison C., Gutiérrez-Marco, Juan Carlos, Candela, Yves, Harper, David A. T., Ortega-Hernández, Javier, Ma, Xiaoya, Rida, Ariba, Vizcaïno, Daniel, and Lefebvre, Bertrand
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- 2022
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3. Cannibalization of a late Cambrian backarc in southern Peru: New insights into the assembly of southwestern Gondwana
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Hodgin, Eben Blake, Gutiérrez-Marco, Juan Carlos, Colmenar, Jorge, Macdonald, Francis A., Carlotto, Víctor, Crowley, James L., and Newmann, Justin R.
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- 2021
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4. Cornulitids (tubeworms) from the Late Ordovician Hirnantia fauna of Morocco
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Gutiérrez-Marco, Juan Carlos and Vinn, Olev
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- 2018
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5. First occurrence of Pterotheca (Gastropoda) from the Silurian (Aeronian) of Spain
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Ebbestad, Jan Ove R. and Gutiérrez-Marco, Juan Carlos
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- 2017
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6. Middle Ordovician trilobites from the Castillejo Formation, Eastern Iberian Range (NE Spain): taxonomic reappraisal, biostratigraphy, and correlation.
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ROMERO, Sara and GUTIÉRREZ-MARCO, Juan Carlos
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PALEONTOLOGICAL excavations ,TAXONOMY ,ORDOVICIAN paleontology ,BIOSTRATIGRAPHY ,SPECIES ,PROVINCES ,PSAMMOBIIDAE ,AGE ,TRILOBITES - Abstract
Copyright of Spanish Journal of Palaeontology is the property of Socieadad Espanola de Paleontologia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2023
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7. Polar gigantism and remarkable taxonomic longevity in new palaeoscolecid worms from the Late Ordovician Tafilalt Lagerstätte of Morocco.
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García-Bellido, Diego C. and Gutiérrez-Marco, Juan Carlos
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IRON oxides , *LONGEVITY , *TRILOBITES , *MUDSTONE , *BRYOZOA ,GONDWANA (Continent) - Abstract
The Late Ordovician Tafilalt Biota of the Moroccan Anti-Atlas includes a diverse range of soft-bodied organisms, including palaeoscolecids, paropsonemid eldonioids, graptolites and cheloniellid arthropods, as well as a rich assemblage of mineralised taxa, among them conulariids, trilobites and echinoderms, often found as articulated skeletons. The new fossil locality, not far from the original Bou Nemrou site, has produced two new palaeoscolecid taxa, the new genus and species Anguiscolex africanus and the new species Wronascolex superstes. They are preserved as compression fossils in fine-grained mudstones, where the original phosphatic sclerites have been diagenetically substituted by pyrite and later weathered to iron oxides, giving them a characteristic rusty colour. This area of Gondwana was located adjacent to the Late Ordovician South Pole and both Anguiscolex africanus gen. et sp. nov. and Wronascolex superstes sp. nov. present a degree of polar gigantism, which has been suggested for other taxa in such high palaeolatitudes such as bryozoans, conulariids, trilobites and radiodonts. Lastly, the occurrence of Wronascolex extends the distribution of this typically Cambrian taxon into the Late Ordovician, indicating a total range for the genus exceeding 60 million years, more than any other palaeoscolecid genus described to date. [ABSTRACT FROM AUTHOR]
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- 2023
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8. Biostratigraphy and palaeoecology of Lower Ordovician graptolites from the Fezouata Shale (Moroccan Anti-Atlas)
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Gutiérrez-Marco, Juan Carlos and Martin, Emmanuel L.O.
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- 2016
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9. Conodonts from the Lower Ordovician of Morocco — Contributions to age and faunal diversity of the Fezouata Lagerstätte and peri-Gondwana biogeography
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Lehnert, Oliver, Nowak, Hendrik, Sarmiento, Graciela N., Gutiérrez-Marco, Juan Carlos, Akodad, Mustapha, and Servais, Thomas
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- 2016
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10. Graptolite Synrhabdosomes: Biological or Taphonomic Entities?
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Gutiérrez-Marco, Juan Carlos and Lenz, Alfred C.
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- 1998
11. An Unusual New Sinuitid Mollusc (Bellerophontoidea, Gastropoda) from the Ordovician of Spain
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Frýda, Jiří and Gutiérrez-Marco, Juan Carlos
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- 1996
12. Management of the Palaeozoic Palaeontological Heritage Associated With Metamorphic Bedrocks: Courel Mountains UNESCO Global Geopark (Spain)
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Ballesteros, Daniel, García Ávila, Manuel, Diez, José B., Vila, Ramón, Barros, Xosé Carlos, Gutiérrez Marco, Juan Carlos, Caldevilla, Pablo, and Alemparte, Martín
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geoconservation ,unesco global geopark ,museum ,palaeontological heritage ,General. Including nature conservation, geographical distribution ,QH1-199.5 ,Paleontología ,management ,teaching ,virtual models - Abstract
The Spanish Courel Mountains UNESCO Global Geopark has strong educational and touristic resources despite limited preservation of Paleozoic invertebrate fossil assemblages within metamorphic rocks. The paleontological sites are managed by means of their inventory and integration in a Geographical Information System, the construction of virtual 3D fossil models, the creation of a fossil collection exhibition, the transport of large boulders with fossils to places such as tourist offices, and hiking trails to see ichnofossils. To enable geoconservation, the Palaeozoic paleontological sites are neither promoted nor frequently visited. Fossils found in the Geopark by paleontologists and fortuitously by local people or hikers are deposited and safeguarded in the Geological Museum and are available for eventual exhibition and paleontological studies.
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- 2021
13. Filling the Silurian gap of solutan echinoderms with the description of new species of Dehmicystis from Spain.
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ZAMORA, SAMUEL and GUTIÉRREZ-MARCO, JUAN CARLOS
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ECHINODERMATA , *SPECIES , *DETRITUS , *SEDIMENTS , *SEA urchins - Abstract
Solutans were among the most enigmatic pre-radial and asymmetric echinoderms. A new species Dehmicystis ariasi sp. nov. is described from the upper part of the Llagarinos Formation, lower Ludlow (Silurian) of Northwest Spain. This is the first solutan formally described from Iberia and the first from the Silurian worldwide. Dehmicystis was previously known based on a small number of poorly preserved specimens from the Emsian, Lower Devonian Hunsrück Slate of Germany. New observations based on the newly studied material suggest that Dehmicystis displayed a feeding appendage facing towards the substrate, and the periproct on the opposite face of the theca. Comparisons with other solutans and new data suggest that Dehmicystis was a detritus feeder that moved over the substrate capturing organic particles from the sediment with a single feeding arm. [ABSTRACT FROM AUTHOR]
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- 2023
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14. New Middle and Late Ordovician cornute stylophorans (Echinodermata) from Morocco and other peri-Gondwanan areas
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Lefebvre, Bertrand, Nohejlová, Martina, Martin, Emmanuel L.O., Kasicka, Libor, Zicha, Ondřej, Gutiérrez-Marco, Juan Carlos, Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), and Czech Geological Survey [Praha]
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[SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy ,[SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology - Abstract
International audience
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- 2022
15. The Sommerodde (Telychian, Silurian) positive carbon isotope excursion: why is its magnitude so variable?
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Loydell, David K., Gutiérrez-Marco, Juan Carlos, and Štorch, Petr
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CARBON isotopes , *MUDSTONE , *ORGANIC compounds - Abstract
The Sommerodde positive organic carbon isotope excursion (SOCIE) within the Oktavites spiralis graptolite Biozone (Telychian, Silurian) was first identified in the Sommerodde-1 core, Bornholm, Denmark, where it is the largest positive excursion within the Upper Ordovician–lower Silurian part of the core. Other published occurrences of the SOCIE are discussed here, including new δ 13Corg data from the Jabalón River section, Corral de Calatrava, central Spain, where the SOCIE is only a very minor positive excursion. Very unusually, the SOCIE is best developed in deeper water settings, contrary to the typical pattern of declining excursion magnitude offshore. In the Sommerodde-1 core (Bornholm), and where it has been tentatively identified in the Vežaičiai-2 core (Lithuania), the SOCIE is developed in pale, organic-poor mudstones. It is considered likely that the magnitude of the SOCIE has been enhanced in the Sommerodde-1 core record by a change in organic matter composition in the deep-marine environment that did not have such a significant effect in shallower marine environments. Supplementary material: A table of organic carbon isotope data from the Jabalón River section, Corral de Calatrava, central Spain is available at https://doi.org/10.6084/m9.figshare.c.6769514 Thematic collection: This article is part of the Chemical Evolution of the Mid-Paleozoic Earth System and Biotic Response collection available at: https://www.lyellcollection.org/topic/collections/chemical-evolution-of-the-mid-paleozoic-earth-system [ABSTRACT FROM AUTHOR]
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- 2023
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16. Late Ordovician molluscs of the central and eastern Anti-Atlas, Morocco
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Ebbestad, Jan Ove R., Polechová, Marika, Kröger, Björn, Gutiérrez-Marco, Juan Carlos, Hunter, A. W., Álvaro, J. J., Lefebvre, B., van Roy, P., Zamora, S., Natural Sciences Unit, and Finnish Museum of Natural History
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1171 Geosciences ,MIDDLE ORDOVICIAN ,FAUNA ,education ,SILURIAN GASTROPODS ,PARAGASTROPODA ,PALEOECOLOGY ,PALEOZOIC PALEOBIOGEOGRAPHY ,DIVERSIFICATION ,FEZOUATA FORMATION ,BIVALVES ,PRAGUE BASIN - Abstract
More than 30 species of tergomyan, gastropod, bivalve and cephalopod molluscs are described from the Late Ordovician of central and eastern Anti-Atlas, Morocco. For the cephalopods this represents the first systematically known taxa of the region. Tergomyans and gastropods are most common in the more shaly part of the Lower Ktaoua Formation, while bivalves are more frequent in the sandy part of the Lower Second Bani Formation. A southern Gondwana aspect is evident for the tergomyan, gastropod and bivalve assemblages, sharing many taxa with Bohemia, while no clear signal is present for the cephalopods. The latter reflects insufficient knowledge of the fauna of large parts of these areas. The widely recognized Holopea? antiquata is transferred to the genus Radvanospira gen. nov.; other new gastropod taxa include Allossospira gen. nov., Tritonophon grandis sp. nov., Radvanospira baniensis sp. nov. and Lophospira latilabra sp. nov. Most of the diverse bivalve fauna and the few cephalopods are left in open nomenclature but new taxa include the bivalve Praenucula pojetai sp. nov. and the cephalopods Wadema tattai sp. nov. and Tafadnatoceras tiouririnense gen. et. sp. nov. The Late Ordovician bivalves from Morocco are dominated by pteriomorphs and protobranchs, inhabiting infaunal, semi-infaunal and epifaunal niches.
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- 2022
17. Pentaradiate diploporites (Echinodermata) from the Spanish Middle Ordovician and their taxonomic significance.
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PAUL, Christopher R. C. and GUTIÉRREZ-MARCO, Juan Carlos
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ECHINODERMATA classification ,ORAL interpretation ,ECHINODERMATA ,ORDOVICIAN-Silurian extinction event ,ECHINODERMATA populations ,SUTURES ,PERISTOME (Botany) ,SUTURING ,CARPENTERS - Abstract
Copyright of Spanish Journal of Palaeontology is the property of Socieadad Espanola de Paleontologia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2022
- Full Text
- View/download PDF
18. The outstanding Silurian section of the Valle syncline (Sierra Norte de Sevilla UNESCO Global Geopark, Spain) as an international standard for graptolite biostratigraphy
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Gutiérrez-Marco, Juan Carlos, Loydell, David, and Štorch, Petr
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The Palaeozoic succession of the Sierra Norte de Sevilla UNESCO Global Geopark (Ossa Morena Zone of the Iberian Massif, SW Spain) includes a nearly complete Silurian succession, ca. 150 m in thickness, deposited in outer shelf settings. Among sections explored along the western end of the El Pintado reservoir, in the core part of the Valle syncline, the El Pintado-1 section exhibits graptolite rich Silurian black-shale facies ranging from the base of the Rhuddanian to the upper Ludfordian. Most of the standard graptolite biozones of the Silurian System have been identified in this succession, and high-resolution biostratigraphical studies have led to the unanimous candidacy of this section as replacement GSSP for the base of the Telychian Stage by the International Subcommission on Silurian Stratigraphy. The preliminary record of Llandovery graptolites in the lower part of the succession so far comprises more than 200 species, 19 of them new. Graptolites from the upper Telychian and from the remaining part of the Silurian succession have not yet been studied in detail. The condensed, almost entirely graptolitic black shale Silurian succession of the El Pintado-1 geosite is of enormous value for the world’s palaeontological heritage, reinforced by the future placement here of the GSSP for the base of the Telychian Stage. Due to its fragility and exclusively scientific nature, the section is not open to public visitors of the Geopark, and its difficult accessibility also adds some protection to this internationally important geosite, favouring its conservation beyond the regional legislative framework.
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- 2021
19. Giant Trilobites and Other Middle Ordovician Invertebrate Fossils from the Arouca UNESCO Global Geopark, Portugal
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Sá, Artur A., Pereira, Sofia, Rábano, Isabel, and Gutiérrez Marco, Juan Carlos
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geoparks ,sustainable development ,Portugal ,General. Including nature conservation, geographical distribution ,QH1-199.5 ,Paleontología ,geotourism ,geoheritage ,geoconservation ,Canelas slate quarry ,Ordovician geosite ,giant trilobites ,Arouca UNESCO Global Geopark - Abstract
The giant Ordovician trilobites from the Canelas quarry constitute the most iconic sign of identity of the Arouca UNESCO Global Geopark at an international level. Palaeontological studies determined the importance of this fossil locality for studying aspects of the social behavior of these marine arthropods and their interactions with other represented invertebrate fossil groups. Although part of the famous ‘gigantism’ of the fossils represented in the slate quarry is due to tectonic expansion, which is responsible for one-third of the outstanding size of the fossils, there is no doubt that this locality, sometimes considered as a fossil lagerstätte, has a great scientific interest and represents a unique international reference among the geological heritage of Portugal. The construction of an on-site museum and the establishment of a geotrail around the quarry have turned this geosite into an example of cooperation between extractive industry, education, science and sustainable development. The formal partnership established with the AGA – Arouca Geopark Association reinforces the projection of this geosite, allowing its disclosure in exhibitions and educational programs, as well as the collaboration with the scientific community., Departamento de Geologia, Universidade de Trás-os-Montes e Alto Douro, Portugal, Centro de Geociências, Universidade de Coimbra, Portugal, Instituto Geológico y Minero de España, España, Instituto de Geociencias, Consejo Superior de Investigaciones Científicas, España, Instituto de Geociencias, Universidad Complutense de Madrid, España, Área de Paleontología, Universidad Complutense de Madrid, España
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- 2021
20. Unusual assemblage of conulariids (Cnidaria, Scyphozoa) from the Taddrist Formation (Middle Ordovician, Darriwilian) of southern Morocco.
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Van Iten, Heyo, Gutiérrez-Marco, Juan Carlos, and Cournoyer, Mario E.
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SHALE , *SPECIES , *CNIDARIA , *INVERTEBRATES ,LAURENTIA (Continent) - Abstract
Silty noduliferous shales in the lower part of the Middle Ordovician (late Darriwilian 2) Taddrist Formation in the central Moroccan Anti-Atlas contain a unique assemblage of conulariids consisting of one species each of Archaeoconularia Bouček, 1939, Glyptoconularia Sinclair, 1952, and Pseudoconularia Bouček, 1939. Glyptoconularia antiatlasica new species, currently represented by a single three-dimensional specimen, is the first member of this extremely rare, highly autapomorphic genus to be described from outside of cratonic North America as well as the first Glyptoconularia from the Middle Ordovician. Pseudoconularia cf. P. grandissima (Barrande, 1867) and Archaeoconularia cf. A. exquisita (Barrande, 1867) most closely resemble species previously described from Middle and Upper Ordovician strata in the Prague Basin (Czech Republic), then located adjacent to North Africa. Anaconularia anomala (Barrande, 1867), previously known from the Upper Ordovician (Sandbian) Libeň and Letná formations in the Prague Basin, is documented for the first time from the Upper Ordovician (Katian) Upper Tioririne Formation of Morocco. In addition to extending the known stratigraphical and paleogeographical ranges of these conulariids, results of the present investigation add to the list of invertebrate taxa that appear to have originated during Early or Mid-Ordovician times in peri-Gondwana or south-polar Gondwana, and then migrated to the eastern margin of Laurentia, arriving there along with other cool-water taxa during the Sandbian-Katian transition. UUID: http://zoobank.org/9ea5051b-cff5-4911-861a-531db4f45883 [ABSTRACT FROM AUTHOR]
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- 2022
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21. Ordovician stratigraphy and benthic community replacements in the eastern Anti-Atlas, Morocco
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Álvaro, J. Javier, Benharref, Mohammed, Destombes, Jacques, Gutiérrez-Marco, Juan Carlos, Hunter, Aaron W., Lefebvre, Bertrand, VAN ROY, Peter, Zamora, Samuel, Laboratoire de paléontologie et paleogéographie du paleozoique (LPPP), Université de Lille, Sciences et Technologies-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Faculté des Sciences Semlalia [Marrakech], Université Cadi Ayyad [Marrakech] (UCA), Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon] (LGL-TPE), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon), School of Geological Sciences, University College Dublin [Dublin] (UCD), Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Ministerio de Ciencia, Innovación y Universidades (España), Álvaro, J. Javier, Gutiérrez-Marco, Juan Carlos, Hunter, Aaron W., Lefebvre, Bertrand, and Zamora, Samuel
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Project administration: Supporting) ,[SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy ,Formal analysis: Supporting ,MOHAMMED BENHARREF (Data curation: Supporting) JACQUES DESTOMBES (Data curation: Supporting ,[SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology ,Methodology: Supporting - Abstract
The Anti-Atlas contains a thick, volcanic-free Ordovician succession that originally deposited in a passive-margin basin. Three main sedimentary packages are bounded by major unconformities: (i) the Tremadocian–Floian Lower Fezouata and Upper Fezouata formations, which unconformably overlie a palaeorelief of Cambrian rifting volcanosedimentary complexes, and are subsequently topped by a Dapingian para-conformable gap; (ii) the Darriwilian–Katian Tachilla Formation and First Bani and Ktaoua groups, the latter unconformably overlain by a Hirnantian glaciogenic succession; and (iii) the Second Bani Group, which subsequently infilled the former glaciogenic palaeorelief. Due to the scarcity of carbonate interbeds for etching analyses, leading to rare references of conodonts, the global Ordovician chart is interpolated on the basis of microphytoplancton (acritarchs and chitinozoans), regional graptolites and brachiopods. The Ordovician counter-clockwise rotation of Gondwana led its Moroccan margin from mid-to high-latitude positions, leading to the onset of a siliciclastic, wave-and storm-dominated platform. Flooding surfaces are marked by shelly silty carbonate interbeds that reflect the episodic development of echinoderm–bryozoan meadows during Katian times; in areas protected from siliciclastic input, they reached massive and bedded bioaccumulations (Khabt-el-Hajar Formation). The Hirnantian glaciation controlled the incision of numerous tunnel channels, infilled with both alluvial to fluvial sediments and glaciomarine diamictites. The Hirnantian palaeorelief was definitively sealed during Silurian times., The authors thanks the useful and detailed revisions made by J. Colmenar, T. Servais and one 661 anonymous referee. This work is dedicated to the memory of Jacques Destombes who left us 662 during the redaction of this synthesis.This paper is a contribution to Spanish project CGL2017-663 19 87631-P from Spanish Ministry of Science, Innovation and Universities and IGCP 653 (IUGS-664 UNESCO) project ‘The Onset of the Great Ordovician Biodiversification Event’.
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- 2019
22. New Middle Ordovician hyoliths from the Ossa Morena Zone, southwestern Spain.
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Gutiérrez-Marco, Juan Carlos, Marek, Ladislav, and Malinky, John M.
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PROVINCES - Abstract
The record of Middle Ordovician (Oretanian, ca. Darriwilian 2) hyolithids from the Ossa Morena Zone of the Iberian Massif in southwestern Spain is increased with the recognition of Robardetlites sevillanus n. gen. n. sp., Andalucilites parvulus n. gen. n. sp., Pauxillites desolatus n. sp., Leolites malinkyi Marek and Gutiérrez-Marco n. sp., and Cavernolites sp. in that region. Andalucilites n. gen. and Robardetlites n. gen. are endemic whereas the other genera are known from coeval strata in the Barrandian region in central Europe, France, and Morocco, giving this assemblage a decidedly "Mediterranean province" character. The discovery of Pauxillites, Leolites, and Cavernolites in Iberia extends their geographic ranges to that region, and Leolites from this area extends its stratigraphic range downward, making its occurrence in Iberia the oldest known for that genus. UUID: http://zoobank.org/f5b29223-6dac-4c7e-8851-551e634da667 [ABSTRACT FROM AUTHOR]
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- 2022
- Full Text
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23. Late Cambrian acritarchs from the “Túnel Ordovícico del Fabar”, Cantabrian Zone, N Spain
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Albani, Roberto, Bagnoli, Gabriella, Bernárdez, Enrique, Gutíerrez-Marco, Juan Carlos, and Ribecai, Cristiana
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- 2006
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24. Fossilized appendages and guts in three phacopid triobites from the Tremadocian lower Fezouata Konservat-Lagerstätte (Lower Ordovician, Morocco)
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Lefebvre, Bertrand, Lerosey-Aubril, Rudy, Martin, Emmanuel L.O., Gutiérrez-Marco, Juan Carlos, Garcia-Bellido, Diego, Rabano, Isabel, Saleh, Farid, Vidal, Muriel, Van Roy, Peter, Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), University of New England (UNE), Laboratoire Géosciences Océan (LGO), Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), School of Geological Sciences, University College Dublin [Dublin] (UCD), Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon] (LGL-TPE), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon), Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), and LEFEBVRE, Bertrand
- Subjects
[SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy ,[SDU.STU.ST] Sciences of the Universe [physics]/Earth Sciences/Stratigraphy ,[SDU.STU.PG] Sciences of the Universe [physics]/Earth Sciences/Paleontology ,[SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology ,ComputingMilieux_MISCELLANEOUS - Abstract
Trabajo presentado en el 5th International Palaeontological Congress, celebrado en París (Francia) del 9 al 13 de julio de 2018, The Fezouata Shale has yielded remarkably diverse assemblages of non-biomineralizing and biomineralizing organisms of Early Ordovician age. Overall, some 160 genera have been documented, about a quarter of which are essentially soft-bodied. Exceptional preservation in the Fezouata Shale occurs in two main separated intervals, of late Tremadocian and mid-Floian age respectively. These intervals are best regarded as distinct Konservat-lagerstätten, since they contain different faunas and are separated in time by c. 9 Ma. Both assemblages are dominated by arthropods, including a diverse trilobite fauna (c. 25 genera). Here we report the discovery of fossilized appendages and guts in 31 trilobite specimens from the lower Fezouata Konservat-lagerstätte belonging to the genera Anacheirurus, Bavarilla, and Prionocheilus (Order Phacopida). The preservation of appendages is generally poor, especially for their proximal parts covered by the dorsal exoskeleton. However, when appendages project from below the dorsal carapace, they exhibit delicate structures, such as annuli boundaries and lateral spines of antennae, or podomere boundaries, clustered endites and terminal claws of endopods. Lamellate exopods are rarely preserved, and when they are, their morphologies are largely obscured by the dorsal carapace. Appendages are typically preserved as thin, yellowish films of iron oxides, interpreted as oxidized pyrite. Among preserved gut structures, Anacheirurus displays a parallel-sided, sediment-filled digestive tract, running under the entire trunk axis while the tract of Bavarilla (wide and sediment-filled) is associated with 10 pairs of digestive glands, which are atypically preserved as a sediment infill. The new examples of fossilized ‘soft’-parts of trilobites from the lower Fezouata Lagerstätte complement previous observations in Megistaspis and Symphysurus, two taxa also belonging to the pilekiid-bavarillid biofacies typical of lower shoreface settings. Despite notable differences in size and affinities, the preservational styles are essentially the same in all specimens, suggesting that only a limited number of taphonomic pathways is responsible for the preservation of trilobite labile parts in these horizons. In addition to the work on the preserved soft parts, the morphological variability of preserved hard parts is currently also under study; in time, this will result in detailed systematic (re)descriptions of the taxa at hand.
- Published
- 2018
25. Palaeobiogeographic implications of exceptionally preserved Late Ordovician echinoderm assemblages from the Tafilalt area, Morocco
- Author
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Lefebvre, Bertrand, Gutiérrez-Marco, Juan Carlos, Hunter, Aaron, Nohejlová, Martina, Nardin, Elise, Sumrall, Colin D., Zamora, Samuel, Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Mécanismes et Transfert en Géologie (LMTG), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon] (LGL-TPE), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), and Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
[SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy ,[SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
- Published
- 2018
26. Phragmolites (Gastropoda) from the Late Ordovician of the Peruvian Altiplano.
- Author
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Ebbestad, Jan Ove R. and Gutiérrez-Marco, Juan Carlos
- Subjects
- *
GASTROPODA , *BRACHIOPODA , *FACIES , *FLUTE , *LATEX , *ORDOVICIAN Period ,GONDWANA (Continent) ,LAURENTIA (Continent) - Abstract
Phragmolites lissoni new species is described from 11 specimens found in the Sandbian Calapuja Formation near Calapuja in Peru. The deposits are part of the Central Andean Basin. This is the hitherto only systematically described Ordovician gastropod from Peru. The species is from a brachiopod-dominated siliciclastic sequence and is associated with bryozoans. Most specimens are preserved as external molds, but latex casts yield excellent details of shell ornamentation and are used as a basis for evaluating this feature in the genus. The characteristic ornamentation of Phragmolites should be called corrugated lamellae, and the individual elements on these should be referred to as flutes. A descriptive terminology for these is suggested. The development and shape of the corrugated lamellae and flutes could be biomechanical process. A second component in lamellar formation is the alternation between regular incremental growth and formation of a lamella. Phragmolites is mainly found in shallow-water carbonate facies from tropical latitudes in the Sandbian and a mid-latitude presence in Peru is unexpected. Brachiopods from the same section in Calapuja show affinities with faunas of the Mediterranean margin of Gondwana but also weak links with Avalonia. Phragmolites is found abundantly in deeper-water facies in Laurentia, and a broad tolerance to facies and temperature and possible planktotrophy might have allowed a wide geographical dispersal of the genus. The scant record of Ordovician gastropods in the Central Andean Basin precludes comparison with the disparate record of the Ordovician gastropod taxa from the Precordillera, which do not include Phragmolites. UUID: http://zoobank.org/References/fbd7a43e-a610-42fd-a31d-b1a16fa69c9b [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
27. First record of a nonpaleotropical intejocerid cephalopod from Darriwilian (Middle Ordovician) strata of central Spain.
- Author
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Kröger, Björn and Gutiérrez-Marco, Juan Carlos
- Subjects
- *
RECORDS , *BEDS , *SPECIES ,GONDWANA (Continent) - Abstract
The order Intejocerida is an enigmatic, short-lived cephalopod taxon known previously only from Early–Middle Ordovician beds of Siberia and the United States. Here we report a new genus, Cabaneroceras, and a new species, C. aznari, from Middle Ordovician strata of central Spain. This finding widens the paleogeographic range of the order toward high-paleolatitudinal areas of peri-Gondwana. A curved conch, characteristic for the new genus, was previously unknown from members of the Intejocerida. UUID: http://zoobank.org/21f0a09c-5265-4d29-824b-6b105d36b791 [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
28. A graptolite-rich Ordovician–Silurian boundary section in the south-central Pyrenees, Spain: stratigraphical and palaeobiogeographical significance.
- Author
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ŠTORCH, PETR, BERNAL, JOSEP ROQUÉ, and GUTIÉRREZ-MARCO, JUAN CARLOS
- Subjects
GRAPTOLITES ,CARBON isotopes ,BIOSTRATIGRAPHY - Abstract
An Ordovician–Silurian boundary section marked by an uninterrupted, relatively high rate of black shale sedimentation and abundant, diverse graptolites is described from the south-central Pyrenees. The structurally simple Estana section comprises the uppermost part of the quartzite-dominated Bar Formation and overlying black shales of late Hirnantian and early Rhuddanian age, which have been dated by graptolites to the upper Metabolograptus persculptus and lower–middle Akidograptus ascensus–Parakidograptus acuminatus biozones. Due to the absence of M. persculptus , a Metabolograptus parvulus Biozone correlative with the upper part of the persculptus Biozone is recognized below the lowest occurrence of akidograptids, which indicate the base of the Silurian System. The graptolite fauna comprise 27 species including Normalograptus minor , N. lubricus , N. rhizinus , Hirsutograptus , Korenograptus bifurcus , K. bicaudatus, K. lanpherei and Nd. shanchongensis , most of which were formerly considered to be endemic to the low-latitude palaeobiogeographical province of China, Siberia and northern North America. Two new species, N. baridaensis and N. ednae , are described. The succession of graptolite assemblages in the Estana section, and occurrence of several cosmopolitan taxa in its parvulus and lower ascensus – acuminatus biozones that are unknown elsewhere in peri-Gondwanan Europe, suggest that strata immediately surrounding the Ordovician–Silurian boundary may be absent, highly condensed or oxic and barren of graptolites in other sections of northwestern peri-Gondwana. Common graptolite synrhabdosomes and abnormal rhabdosomes may indicate some environmental stress in the parvulus Biozone, although the rather uniform black shale lithology, total organic carbon content and δ
13 Corg values suggest uninterrupted sedimentation under stable, anoxic conditions. [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF
29. A revised correlation of Lower Ordovician sedimentary rocks in the Central Iberian Zone, Portugal and Spain
- Author
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Sá, Artur Abreu, Gutiérrez-Marco, Juan Carlos, Pinto de Meireles, Carlos Augusto, García-Bellido, Diego C., and Rábano, Isabel
- Subjects
Rochas sedimentares ,Zona Centro Ibérica (Portugal, Espanha) ,Correlação estratigráfica ,Ordovícico Inferior - Published
- 2013
30. Evolution of trilobite enrolment during the Great Ordovician Biodiversification Event: insights from kinematic modelling.
- Author
-
Esteve, Jorge, Gutiérrez‐Marco, Juan Carlos, Rubio, Pedro, and Rábano, Isabel
- Subjects
- *
ORDOVICIAN radiation (Evolution) , *TRILOBITES , *CAMBRIAN explosion (Evolution) , *ARTHROPODA , *PHACOPIDA - Abstract
The Great Ordovician Biodiversification Event (GOBE) represents a diversification at lower taxonomic levels of most body plans that had appeared during the Cambrian explosion. Among trilobites, several novelties related to enrolment evolved during the GOBE. A kinematic analysis by means of 3D modelling of some new enrolment types shows no relationship with those of the Cambrian trilobites. While some structures emerged for the first time in Ordovician trilobites (e.g. articulations and panderian organs), other structures (e.g. anterior and posterior arch in head and tail) appear earlier in Cambrian trilobites. Our results suggest that the evolution of some groups was clearly rooted in the Cambrian explosion while others clearly appeared during the GOBE. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
31. The dawn of a dynasty: life strategies of Cambrian and Ordovician brachiopods.
- Author
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Topper, Timothy P., Zhang, Zhifei, Gutiérrez‐Marco, Juan Carlos, and Harper, David A. T.
- Subjects
BRACHIOPODA ,CAMBRIAN explosion (Evolution) ,PALAEOCOPIDA ,ORDOVICIAN-Silurian extinction event ,MARINE ecology - Abstract
Brachiopods are among the first animal phyla to emerge from the Cambrian Explosion, rapidly diversifying to all major palaeocontinental blocks within 20 million years. The group underwent another steep rise in diversity during the Ordovician, and their relative abundance and diversity made them one of the most successful invertebrate groups during the entire Palaeozoic. During this time, brachiopods lived in a range of environments and represented a significant component of marine ecosystems, yet information regarding their modes of life and ecology is somewhat limited. Recent studies, primarily from the Chengjiang and Burgess Shale Lagerstätten, have revealed that by the Middle Cambrian (Series 3, Stage 5) brachiopods from across the phylum had already developed a range of ecological strategies and life modes. Cambrian brachiopods occupied distinct trophic niches on soft and hard substrates and exhibited at least five types of lifestyles: pedicle attachment, pedicle anchoring, cemented, free‐lying and semi‐infaunal. Comparisons with Ordovician benthic assemblages show that despite the explosion of brachiopod taxa witnessed in the Ordovician, with the exception of the appearance of burrowing brachiopods, life strategies of brachiopods remained largely the same. Indicating that the majority of life modes observed in brachiopods had rapidly evolved and was already in place prior to the Great Ordovician Biodiversity Event. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
32. Ordovician graptolites and acritarchs from the Barrancos region (Ossa-Morena Zone, South Portugal)
- Author
-
Piçarra, José Manuel, Zélia Pereira, and Gutiérrez-Marco, Juan Carlos
- Subjects
Graptólitos ,Fósseis ,Zona de Ossa-Morena (Portugal) ,Acritarcas ,Região de Barrancos (Portugal) ,Ordovícico ,Portugal (Sul) - Abstract
Submitted by Paula Serrano (paula.serrano@ineti.pt) on 2014-08-11T13:54:47Z No. of bitstreams: 1 35096.pdf: 9650452 bytes, checksum: d58a2b0210b4bd09bf275b5dd4560f6d (MD5) Approved for entry into archive by Paula Serrano (paula.serrano@ineti.pt) on 2014-08-11T13:54:56Z (GMT) No. of bitstreams: 1 35096.pdf: 9650452 bytes, checksum: d58a2b0210b4bd09bf275b5dd4560f6d (MD5) Made available in DSpace on 2014-08-11T13:54:56Z (GMT). No. of bitstreams: 1 35096.pdf: 9650452 bytes, checksum: d58a2b0210b4bd09bf275b5dd4560f6d (MD5) Previous issue date: 2011
- Published
- 2011
33. Ordovician VS. 'Cambrian' ichnofossils in the Armorican quartzite of central Portugal
- Author
-
Artur Sá, Gutiérrez-Marco, Juan Carlos, Piçarra, José Manuel, García-Bellido, Diego C., Vaz, Nuno, and Aceñolaza, Guillermo Florencio
- Subjects
Quartzitos ,Icnofósseis ,Portugal (Centro) ,Cruzianas ,Ordovícico - Abstract
Submitted by Paula Serrano (paula.serrano@ineti.pt) on 2014-08-11T13:43:34Z No. of bitstreams: 1 35094.pdf: 9460199 bytes, checksum: 41e23f48c2681e182ccdf167338c0435 (MD5) Approved for entry into archive by Paula Serrano (paula.serrano@ineti.pt) on 2014-08-11T13:43:45Z (GMT) No. of bitstreams: 1 35094.pdf: 9460199 bytes, checksum: 41e23f48c2681e182ccdf167338c0435 (MD5) Made available in DSpace on 2014-08-11T13:43:45Z (GMT). No. of bitstreams: 1 35094.pdf: 9460199 bytes, checksum: 41e23f48c2681e182ccdf167338c0435 (MD5) Previous issue date: 2011
- Published
- 2011
34. The Hirnantian stratigraphy of Portugal, with notes on the Trás-os-Montes and Valongo-Arouca areas
- Author
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Sá, Artur Abreu, Pinto de Meireles, Carlos Augusto, Piçarra, José Manuel, Vaz, Nuno, and Gutiérrez-Marco, Juan Carlos
- Subjects
Região de Valongo (Portugal) ,Estratigrafia regional ,Trás-os-Montes (Portugal) ,Região de Arouca (Portugal) - Published
- 2009
35. Silurian stratigraphy and paleontology of the Valongo anticline and Arouca-Tamames syncline, Central-Iberian Zone, Portugal and Spain [Abstract]
- Author
-
Piçarra, José Manuel, Sá, Artur Abreu, Storch, Petr, and Gutiérrez-Marco, Juan Carlos
- Subjects
Sinclinal de Arouca-Tamames ,Zona Centro Ibérica ,Portugal ,Estratigrafia ,Silúrico ,Anticlinal de Valongo (Portugal) ,Paleontologia ,Espanha - Published
- 2009
36. P-rich nodules and hollow graptolites in the upper Silurian of the Moncorvo synclinorium, north Portugal
- Author
-
Sá, Artur Abreu, Piçarra, José Manuel, Gutiérrez-Marco, Juan Carlos, and Sarmiento, Graciela Noemi
- Subjects
Graptólitos ,Silúrico ,Sinclinal de Moncorvo (Portugal) - Published
- 2009
37. An early Ordovician (Floian) conodont fauna from the Eastern Cordillera of Peru (central andean basin)
- Author
-
Gutiérrez Marco, Juan Carlos, Albanesi, Guillermo L., Sarmiento, Graciela N., and Carlotto Caillaux, Víctor Santiago
- Subjects
Conodonta ,Gondwana ,Paleogeografía - Abstract
pp. 147–160 Late Floian conodonts are recorded from a thin limestone lens intercalated in the lower part of the San Jose Formation at the Carcel Puncco section (Inambari River), Eastern Cordillera of Peru. The conodont association includes Gothodus costulatus LINDSTROM, Protopanderodus rectus (LINDSTROM), Drepanoistodus basiovalis (SERGEEVA), Drepanoistodus forceps (LINDSTROM), Drepanodus arcuatus PANDER, Trapezognathus diprion (LINDSTROM), Erraticodon patu COOPER, and Ansella cf. jemdandica (LOFGREN). This species association can be assigned to the upper part of the well-documented Oepikodus evae Zone. It is the northernmost conodont record of late Floian age in South America. This study updates the preliminary data presented in 2001 from this fossil locality, and it has important consequences for the paleogeographic reconstruction of the Peruvian part of the Central Andean Basin. In accordance with trilobites and brachiopods documented for the same strata, the conodont association represents a relatively cold-shallow-water platform environment. The record of late Floian conodonts towards the middle part of the San Jose Formation shows that the base of this unit in the studied section is considerably older than other sections of the distribution area, where its lowermost part is dated as early Darriwilian by the record of graptolites from the Undulograptus austrodentatus graptolite Zone. The diachronous initiation of the marine sedimentation makes the lower part of the Carcel Puncco shales penecontemporaneous with the volcanigenic rocks related with the Arequipa Massif, which transitionally underlie the San Jose Formation in other places of the Altiplano and the Eastern Cordillera of Peru.
- Published
- 2008
38. Ordovician and Silurian geological heritage in protected natural areas of Iberia
- Author
-
Rábano, Isabel, Gutiérrez-Marco, Juan Carlos, Sá, Artur Abreu, San José, Miguel Angel, Pieren Pidal, Agustin P., Sarmiento, Graciela Noemi, Piçarra, José Manuel, Durán Valsero, Juan José, Baeza, Eleuterio, and Lorenzo, Saturnino
- Subjects
Silúrico ,Património geológico ,Áreas protegidas ,Península Ibérica ,Ordovícico - Abstract
The Iberian Peninsula is home to the most extensive outcrops of Ordovician and Silurian rocks in Europe, being mainly located in the Variscan Iberian Massif of Spain and Portugal. Many of these outcrops are outstanding in terms of their geomorphological value and impressive landscape, but also because of the palaeontological record they hold or their exceptional stratigraphic record of certain Ordovician and Silurian successions. The present work proposes 23 sites that typify the rich Iberian geological and palaeontological heritage of these periods, all of them located in natural areas protected by national or regional laws (National and Natural Parks, European Geoparks, Natural Monuments, National Hunting Reserves, or municipal reservations). Selected geosites add value for these natural areas and are chosen in order to disseminate knowledge of the existence of rocks and fossils with examples that are key to interpreting Gondwanan palaeogeography and the regional palaeoenvironmental conditions (cold peri-polar seas with marine platforms bathing a gigantic deserted continent), physical events of local and global nature (eustatism, tectonic events, volcanism), paleobiodiversity, and evolution. The potential of the Iberian Ordovician and Silurian rocks and fossils as a geotouristic and educational resource require the preparation of fixed information panels, on-site museums, geological viewpoints, georoutes, guided visits, and tourist information guides and pamphlets, which are currently being arranged or already established. The effective use of these 23 Ordovician and Silurian geosites can benefit from the protection afforded to the natural areas in which they are located. This work was performed as part of the PATRIORSI project of the Spanish Ministry of Education and Science (CGL2006-07628/BTE, years 2006-2009) and the Geology and Palaeontology of the Cabañeros National Park project funded by the Spanish Ministry of the Environment (Ref. 56/2006, 2006-2009).
- Published
- 2008
39. The written stones of the Montesinho Natural Park : where palaeontology meets popular legend
- Author
-
Sá, Artur Abreu, Gutiérrez-Marco, Juan Carlos, and Pinto de Meireles, Carlos Augusto
- Subjects
Património geológico ,Parque Natural de Montesinho (Portugal) ,Património paleontológico - Abstract
Deep in the memory of the inhabitants of the region of Montesinho (NE Portugal), there is a legend which talks about the existence of enigmatic pedras escrevidas (="written stones") in the mountains near the village of Guadramil. In the first half of the 20th Century, what used to be considered some kind of rock engravings in quartzite, were studied by archaeologists, which interpreted these signs as a kind of very old (and unknown) pre-Roman writing. A modern geological mapping of the area of the Montesinho Natural Park allowed us to rediscover the original sites of these structures and interpret them as ichnofossils. They occur on the Lower Ordovician quartzites, towards the top of the lower member of the Marao Formation (Floian), which crops out extensively in the area, generating the mountainous relief of the Barreiras Brancas-La Culebra sierra. The study of the locality required two excavating campaigns, supported by the Portuguese Ministry of Science, which involved 40 highschool students during the summer of 2002 and 2003 in an area located 5 km north of Guadramil and very close to the Spanish border. It resulted in the exposure and cleaning of an exceptional surface of 40 square meters with a very vast ichnofossil accumulation, reaching a maximum of 2,000 individual specimens by square metre. All of them correspond to horizontal sections of conical structures created by the spiral displacement of steeply inclined J-shaped burrows, assigned to the arthrophycid forms Daedalus halli (Rouault) and Daedalus labechei (Rouault). Both ichnotaxa are widely known in the "Armorican Quartzite" facies of the Lower Ordovician of SW Europe, where massive occurrences reflect opportunistic colonization events on storm generated sandstones. The spectacular bedding plane concentration of these conical burrows in the locality, and the good preservation of the active backfill on their typical spreite (wing-like) structure, is currently being mapped with the purpose of determining the mathematical model underlying the burrowing pattern and ecospace interaction between the sedimentivorous producers. Anyway, this outstanding palaeontological site of the "pedras escrevidas" has no other counterpart in the world, and is of undisputable value for the Iberian geological heritage. In the near future the locality will be protected and included in the touristic programmes and guides enhancing the natural heritage of the Montesinho Natural Park. The detailed ichnological study of this outcrop is being financed through the PATRIORSI project of the Spanish Ministry of Education and Science (CGL2006-07628/BTE, years 2006-2009) and by the project "Identification, Characterization and Conservation of Geological Heritage: a Geoconservation strategy for Portugal", sponsored by the Portuguese Foundation of Science and Technology (PTDC/CTEGEX/ 64966/2006, years 2006-2009).
- Published
- 2008
40. The Bohemo-Iberian regional chronostratigraphical scale for the Ordovician System and palaeontological correlations within South Gondwana.
- Author
-
Gutiérrez‐Marco, Juan Carlos, Sá, Artur A., García‐Bellido, Diego C., and Rábano, Isabel
- Subjects
- *
ORDOVICIAN paleoecology , *ORDOVICIAN Period , *PALEOZOIC paleoecology , *ORDOVICIAN radiation (Evolution) , *BENTHIC animals - Abstract
The Bohemo-Iberian regional scale for South Gondwana, involving the 'Mediterranean Province', comprises five regional stages (Arenigian, Oretanian, Dobrotivian, Berounian and Kralodvorian) plus the global Tremadocian and Hirnantian. The predominance of shallow-water taxa in those high-latitude faunas imposes serious difficulties for correlating the regional succession with the formal global chronostratigraphy because of the almost total absence of the key graptolites and conodonts defining the base of the standard series, stages and stage slices. Instead, the abundant benthic faunas (trilobites, brachiopods, molluscs, echinoderms) of South Gondwanan origin largely dominated in the area from the middle Darriwilian to the late Katian. The poleward faunal migration of originally Avalonian, Baltic, Laurentian and even Asiatic taxa during the Boda Event of global warming progressively ends with the endemicity in the region, where the ensuing benthic assemblages were severely affected by the Hirnantian glaciation. The regional scale significantly improves the precision of correlations between Ordovician strata from SW and central Europe, North Africa and a large part of the Middle East. An updated record of palaeontological data from areas where Mediterranean faunas remain practically unknown, or are still poorly investigated, is also included. Palaeobiogeographical relationships based on the distribution of faunas across South Gondwana are suggested as an improvement for positioning many territories in modern palaeogeographical reconstructions and offer a constructive approach to problems related to the pre-Variscan and pre-Alpine orogenic puzzles. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
41. Revisión bioestratigráfica de las pizarras del Ordovícico Medio en el noroeste de España (zonas Cantábrica, Asturoccidental-leonesa y Centroibérica septentrional)
- Author
-
Gutiérrez Marco, Juan Carlos, Aramburu, Carlos, Arbizu, Miguel, Bernárdez, Enrique, Hacar Rodríguez, M. P., Méndez Bedia, Isabel, Montesinos López, R., Rábano, I., Truyols, J., and Villas, E.
- Subjects
Biostratigraphical review ,España ,Dobrotiviense ,Oretanian ,Dobrotivian ,Macizo Hespérico ,Correlation ,Oretaniense ,Middle Ordovician ,Revisión Bioestratigráfica ,Spain ,Correlaciones ,Darriwiliense ,Hesperian Massif ,Darriwilian ,Ordovícico - Abstract
[ES] La revisión completa de más de un centenar de localidades fosilíferas del Ordovícico Medio situadas en el noroeste del Macizo Hespérico, muestra que el depósito de las pizarras y limolitas oscuras (Formación Luarca y equivalentes), que siguen a las cuarcitas del Arenig, no fue tan uniforme como se consideraba hasta ahora. Las pizarras se sedimentaron esencialmente durante el Oretaniense en la Zona Asturoccidental-Leonesa y en la parte septentrional de la Zona Centroibérica (Dominio del Ollo de Sapo), donde el techo de la unidad se sitúa muy próximo al límite Oretaniense / Dobrotiviense, sin existir ningún yacimiento paleontológico de probada edad dobrotiviense (= "Llandeilo inferior" en sentido clásico). En la Zona Cantábrica, la sedimentación arcillosa se inicia en el Oretaniense superior tardío y prosigue durante el Dobrotiviense. Para el conjunto del área estudiada se caracterizan, o proponen, diversas lagunas estratigráficas de alcance local o regional, y se discuten las circunstancias paleogeográficas generadas por las hipótesis más recientes, que son contrastadas a la luz de los nuevos datos paleoecológicos y paleobiogeográficos. Éstos indican que la sedimentación tuvo lugar en áreas externas y abiertas de la plataforma, relativamente más profundas que en la región surcentroibérica, con áreas de surco donde ingresan elementos mesopelágicos. Desde el punto de vista paleontológico, se reconocieron un total de 97 formas distintas (67 especies presentes en el Oretaniense y 45 en el Dobrotiviense), entre las que destaca la primera aparición conocida de determinadas especies de trilobites y ostrácodos, el registro más moderno de otros, y algunos taxones en común con Avalonia y Baltica, desconocidos hasta el presente en otras áreas del suroeste de Europa, [EN] A complete review of more than one hundred Middle Ordovician fossil localities, distributed within the north western part of the Hesperian Massif, shows that the sedimentation of the dark shales (Luarca Fo rmation and equivalents) that overlie Arenig quartzites with Cruziana (the 'Armorican Quartzite' facies) was not as uniform as it has been supposed for the whole NW Spain. These shales were mainly deposited during the Oretanian in the West Asturian-Leonese Zone and in nort h e rn Central-Iberian Zone (Domain of the Ollo de Sapo Antiform). In these zones, the top of the unit is close to the Oretanian/Dobrotivian boundary, without any fossils with proved Dobrotivian age., Este trabajo ha sido financiado con cargo al Proyecto PB94-1330 de la DGESEIC ["Investigaciones estratigráficas y paleontológicas en las formaciones Luarca y Sueve (Ordovícico Inferior y Medio de Asturias y León)]", y constituye una contribución a los proyectos nº 410 del PICG (IUGS-UNESCO)e "Iberia" de EURO P ROBE (European Science Foundation). La participación de J.C. Gutiérrez-Marco y de I. Rábano se inscribe igualmente en el Proyecto PB96-0839 (Bioestratigrafía de alta resolución y litorradiometría en el Ordovícico Medio-Silúrico de España) de la DGESEIC (Ministerio de Educación y Cultura). La investigación museográfica en colecciones antiguas, forma parte del Proyecto 06/0006/98 ("Investigación y catalogación de colecciones paleontológicas singulares del Museo Geominero"), financiado por la Comunidad de Madrid.
- Published
- 1999
42. The Lower Ordovician Fezouata Konservat-Lagerstätte from Morocco: Age, environment and evolutionary perspectives.
- Author
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Martin, Emmanuel L.O., Pittet, Bernard, Gutiérrez-Marco, Juan-Carlos, Vannier, Jean, El Hariri, Khadija, Lerosey-Aubril, Rudy, Masrour, Moussa, Nowak, Hendrik, Servais, Thomas, Vandenbroucke, Thijs R.A., Van Roy, Peter, Vaucher, Romain, and Lefebvre, Bertrand
- Abstract
The Lower Ordovician Fezouata Konservat-Lagerstätte from southern Morocco has been one of the major palaeontological discoveries of the last decade. It provides a unique insight into one of the most critical periods in the evolution of marine life: the Cambrian–Ordovician transition. However, its potential for deciphering key trends in animal diversification was hitherto largely limited by major uncertainties concerning its stratigraphic position, age and environmental setting. Based on extensive fieldwork, fossil evidence, and facies recognition, our study provides clarification on these three crucial issues. Exceptional preservation is limited to two intervals within the Fezouata Shale. Graptolites indicate a late Tremadocian age for the Fezouata Konservat-Lagerstätte as a whole, which is supported by biostratigraphical evidence provided by acritarchs. Sedimentological features and reconstructed patterns of relative sea-level changes indicate relatively shallow-water environmental conditions, under distal storm influence, in an offshore to lower shoreface siliciclastic ramp setting. The Fezouata Biota represents a unique and exceptional window into the palaeobiodiversity in open-marine conditions, thus contrasting with the other Ordovician Konservat-Lagerstätten presently known. In our analyses of this new set of data, we pave the way for accurate temporal, faunal and environmental comparisons with other Lower Palaeozoic Konservat-Lagerstätten, and unlock the full potential of the Fezouata Biota to better understand the processes and scenarios of early animal radiations. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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43. New Late Ordovician cornulitids from Peru.
- Author
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VINN, OLEV and GUTIÉRREZ-MARCO, JUAN CARLOS
- Subjects
- *
BRACHIOPOD shells , *BRACHIOPODA , *STROPHOMENIDA , *CHONETIDAE - Abstract
Two new species of cornulitids, Cornulites zatoni sp. nov. and Cornulites vilcae sp. nov., are described from the lower part (Sandbian) of the Calapuja Formation of south-western Peru. Late Ordovician cornulitid diversities of Peru (Gondwana) and Estonia (Baltica) are similar. Aggregative growth form dominates among the cornulitids of the Sandbian of Peru. Multiple oriented C. zatoni sp. nov. specimens on a strophomenid brachiopod likely represent a syn vivo encrustation. Cornulitids from the Sandbian of Peru differ from those known from the Sandbian of Baltica. C. zatoni sp. nov. possibly also occurs in the Late Ordovician of Laurentia. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
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44. Nueva evidencia de afinidades con los gasterópodos en moluscos bellerofontiformes típicos
- Author
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Gutiérrez Marco, Juan Carlos and Fryda, J.
- Subjects
Ordoviciani ,Central Iberian Zone ,Mollusca ,Spain ,Gastropoda - Abstract
Se presenta el hallazgo de un bellerofóntido del Ordovicico medio de los Montes de Toledo (Zona Centroibérica), que presenta diversos depósitos secundarios en la superficie externa de la concha, interpretados como perinductura, inductura y coinductura. Tales depósitos se consideraban característicos de ciertos gasterópodos devónico-pérmicos (Euphemitidae), por lo que su primer registro entre los sinuítidos ordovícicos plantea unas relaciones hlogenéticas inéditas con un modo de secreción similar en ambos grupos y, secundariamente, ello representa un nuevo argumento en favor de la clasificación de los Sinuitidae entre los gasterópodos
- Published
- 1996
45. New evidence of gastropod affinities for some key bellerophontiform molluscs
- Author
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Gutiérrez Marco, Juan Carlos and Fryda, J.
- Subjects
Ordoviciani ,Central Iberian Zone ,Mollusca ,Spain ,Gastropoda - Abstract
Se presenta el hallazgo de un bellerofóntido del Ordovicico medio de los Montes de Toledo (Zona Centroibérica), que presenta diversos depósitos secundarios en la superficie externa de la concha, interpretados como perinductura, inductura y coinductura. Tales depósitos se consideraban característicos de ciertos gasterópodos devónico-pérmicos (Euphemitidae), por lo que su primer registro entre los sinuítidos ordovícicos plantea unas relaciones hlogenéticas inéditas con un modo de secreción similar en ambos grupos y, secundariamente, ello representa un nuevo argumento en favor de la clasificación de los Sinuitidae entre los gasterópodos
- Published
- 1996
46. Ordovician graptolites from the basal part of the Palaeozoic transgressive sequence in the Karadere area, Zonguldak Terrane, NW Turkey.
- Author
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Göncöglu, M. Cemal, Sachanski, Valeri, Gutiérrez-Marco, Juan Carlos, and Okuyucu, Cengiz
- Subjects
GRAPTOLITES ,GEOLOGICAL formations ,ORDOVICIAN stratigraphic geology ,ORDOVICIAN Period - Abstract
The Karadere area to the east of Safranbolu in NW Anatolia is one of the very few localities in Turkey where the contact between the Cadomian basement and the Lower Palaeozoic transgressive succession is well exposed. The Ordovician graptolite Rhabdinopora flabelliformis (Eichwald) ssp. was found in the basal part of the Bakacak Formation, indicating an Early to early Late Tremadocian age for the beginning of the Palaeozoic transgression in the Zonguldak terrane. A few metres above this occurrence, another horizon contains Paradelograptus cf. antiquus (T. S. Hall), which mainly ranges into the Late Tremadocian. Higher up in the Ordovician succession, a new graptolite bed confirms an early Darriwilian (Dw1) age for the middle part of the Karadere Formation with the occurrence of the biozonal index Levisograptus austrodentatus (Harris & Keble) and the first record of Tetragraptus cor (Strandmark) in the area. The palaeobiogeographic distribution of these Karadere fossils is in agreement with a peri-Gondwanan affinity of the Zonguldak Terrane of the Pontides, NW Anatolia, during the Early-Middle Ordovician. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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47. First Furongian (late Cambrian) trilobites from the Cantabrian Zone (north-western Spain).
- Author
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ACEŇOLAZA, GUILLERMO F., ALBANI, ROBERTO, BERNÁRDEZ, ENRIQUE, GARCÍA-BELLIDO, DIEGO C., GUTIÉRREZ-MARCO, JUAN CARLOS, RÁBANO, ISABEL, and SÁ, ARTUR A.
- Subjects
CRUSTACEA ,TRILOBITES ,ACRITARCHS ,TRACE fossils ,ORDOVICIAN paleontology ,CANTABRIANS - Abstract
The first Furongian trilobites are described herein from the Cambrian of the Cantabrian Zone, NW Spain. They were collected during the construction of the "Túnel Ordovícico del Fabar" from the shales of "El Fabar Beds" in the La Matosa member of the Barrios Formation. The assemblage includes the aphelaspidine genus Maladioidella, with a specimen identified as M. cf. colcheni, a species previously known from Sierra de la Demanda (Spain), and possibly Sardinia and Oman. Fragments of an indeterminate olenid trilobite and phyllocarid crustaceans have also been recorded. Based on the acritarch assemblage, these beds are considered as late Jiangshanian or earliest Stage 10 of the Cambrian System. The ichnofossil Cruziana semiplicata has also been collected in the tunnel from the upper part of the Ligueria Member (Tremadocian) of the Barrios Formation, clearly postdating the occurrence of Maladioidella colcheni, its supposed tracemarker according to some authors. The separate record of both taxa (a Furongian trilobite and a Cambro-Ordovician trace fossil) does not support this statement, so their relationship would be refuted in this case. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
48. The extent of the Middle Ordovician Dapingian Stage in peri-Gondwanan Europe and north Africa: stratigraphic record, biostratigraphic tools and regional chronostratigraphy.
- Author
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Gutiérrez-Marco, Juan Carlos, Sá, Artur Abreéu, García-Bellido, Diego Capdevila, and Rábano, Isabel
- Subjects
- *
ORDOVICIAN paleontology , *BIOSTRATIGRAPHY , *SANDSTONE , *GRAPTOLITES - Abstract
The boundaries and subdivisions of the global Dapingian stage cannot be adequately characterized in the extensive south-polar Gondwana continental shelves. Correlatable sediments, dated to some extent by palynomorphs, are generally highly condensed in shale facies ( < 10 m thick) or are entirely lacking, whereas in shallow-water sandstones they may locally reach more than 100 m thick. In the absence of valuable data derived from key macrofossils (graptolites and conodonts), the regional chitinozoan biostratigraphy has gone through numerous conceptual variations in the last 20 years, which has not helped a precise definition of the base of the Dapingian, provisionally included in the “upper” Arenigian regional stage of peri-Gondwana. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
49. Middle Ordovician harknessellid brachiopods (Dalmanellidina) from the Mediterranean margin of Gondwana.
- Author
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REYES-ABRIL, JAIME, VILLAS, ENRIQUE, GUTIÉRREZ-MARCO, JUAN CARLOS, JIMÉNEZ-SÁNCHEZ, ANDREA, and COLMENAR, JORGE
- Subjects
BRACHIOPODA ,ORDOVICIAN Period ,PHYLOGENY ,DALMANELLIDAE ,GONDWANA (Continent) - Abstract
The family Harknessellidae Bancroft, 1928 (Orthida, Dalmanellidina) was designed to embrace an assemblage of species referred previously to Harknessella Reed, 1917, and included five genera known mainly from the Middle and Upper Ordovician of England. Herein, we suggest reassigning to this family the genus Cacemia Mitchell, 1974, widespread in the middle Darriwilian (upper Middle Ordovician) of the Iberian and Armorican massifs. Since its designation, Cacemia was placed among the dalmanellidin heterorthids, in spite of its strongly mucronate hinge line, which is totally unknown within this Mediterranean family. A new harknessellid has been identified from the upper Darriwilian beds of the Central Iberian Zone (Central Spain): Isabelella fascicostellata Reyes-Abril & Villas gen. et sp. nov. It is similar to Horderleyella Bancroft, 1928 for its coarsely fascicostellate radial ornamentation and obtuse cardinal angles, although its convexoplane to convexoconcave profile allows discrimination from the typically dorsibiconvex Horderieyella. A phylogenetic analysis of the family places both Cacemia and Isabelella in basal positions of their clades, which fits with their early stratigraphic record. Based on our study, the family Harknessellidae appears to have originated in the high latitude Mediterranean margins of Gondwana during pre-Darriwilian times, before the detachment of Avalonia from Gondwana. The family reached its highest diversification in Avalonia throughout the Late Ordovician, keeping connections with the Mediterranean and Proto-Andean margins of Gondwana, as well as with the mid-latitude palaeocontinents of Baltica and South China. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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50. Orthid brachiopods from the Middle Ordovician of the Central Iberian Zone, Spain.
- Author
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Reyes-Abril, Jaime, Villas, Enrique, and Gutiérrez-Marco, Juan Carlos
- Published
- 2010
- Full Text
- View/download PDF
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