10 results on '"Gutiérrez-Marco, Juan Carlos"'
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2. Polar gigantism and remarkable taxonomic longevity in new palaeoscolecid worms from the Late Ordovician Tafilalt Lagerstätte of Morocco.
- Author
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García-Bellido, Diego C. and Gutiérrez-Marco, Juan Carlos
- Subjects
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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]
- Published
- 2023
- Full Text
- View/download PDF
3. Upper Ordovician trilobites from the Tremedal inlier, Castilian branch of the Iberian Range, NE Spain
- Author
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Pereira, Sofía, Gutiérrez Marco, Juan Carlos, Colmenar Lallena, Jorge, Rábano, Isabel, Ministerio de Economía y Competitividad (España), International Union of Geological Sciences, and United Nations Educational, Scientific and Cultural Organization
- Subjects
Cordillera Ibérica ,Ordovician ,Brachiopods ,Trilobites ,Iberian Range ,Braquiópodos ,Rama castellana ,Castilian Branch ,Ordovícico ,Paleontología - Abstract
[EN] The revision of the Upper Ordovician sequence west of Noguera de Albarracín (Teruel Province) yielded two horizons with trilobites and other fossils. The oldest horizon occurs toward the middle part of the Bronchales Formation and is of Berounian (late Sandbian-early Katian) age, bearing trinucleids (Deanaspis), illaenids (Vysocania) and dalmanitids (Dalmanitina). The youngest studied horizon is located at the base of the Cystoid Limestone Fm. and yielded pliomerids (Ovalocephalus) and illaenids (Cekovia?) of Kralodvorian (Katian 3-4) age. The record of Upper Ordovician fossils in the Castilian branch of the Iberian Range is particularly scarce, and the Bronchales Fm. association now described supports the correlation of this unit with the Fombuena Fm. of the Aragonian branch. Towards the N and NW of the Tremedal inlier, Berounian rocks are absent due to non-deposition or erosion before younger calcareous sedimentation took place. This revision allows to locate a trinucleid trilobite-bearing horizon briefly mentioned in the mid-20th Century but never described or figured. Herein we pinpoint the stratigraphical position of this classical horizon and, due to its importance, present a short systematic section on Deanaspis cf. seunesi., [ES] Se revisa la sucesión del Ordovícico Superior al oeste de Noguera de Albarracín (Teruel), identificándose dos horizontes con trilobites y otros fósiles. El más antiguo se sitúa hacia la parte media de la Formación Bronchales y es de edad Berouniense (Sandbiense/Katiense en la escala global), conteniendo trinucleidos (Deanaspis), illaénidos (Vysocania) y dalmanítidos (Dalmanitina). El horizonte siguiente se localiza en la base de la Fm. Caliza de Cistoideos y es de edad Kralodvoriense (Katiense 3-4), con plioméridos (Ovalocephalus) e illaénidos (Cekovia?). El registro de trilobites y braquiópodos del Ordovícico Superior es particularmente escaso en la rama castellana, donde las formas representadas en la Fm. Bronchales permiten la correlación de esta unidad con la Fm. Fombuena de la rama aragonesa. Al N y NO del Macizo del Tremedal, los materiales berounienses no se depositaron (o fueron erosionados) previamente a las unidades calcáreas del Kralodvoriense. La localización del nivel con Deanaspis cf. seunesi permite situar estratigráficamente las citas locales de trinucleidos, mencionados desde mediados del siglo XX pero nunca descritos o figurados, razón por la cual se añade un pequeño apartado sistemático para este taxón., Este trabajo es una contribución a los proyectos CGL2017- 87631-P del MINEICO e IGCP 653 de la IUGS-UNESCO.
- Published
- 2018
4. Trilobites del Ordovícico Superior del Macizo del Tremedal (rama castellana de la Cordillera Ibérica)
- Author
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Pereira, Sofia, Gutiérrez Marco, Juan Carlos, Colmenar, Jorge, and Rábano, Isabel
- Subjects
Cordillera Ibérica ,Castilian branch ,Ordovician ,Brachiopods ,Trilobites ,Braquiópodos ,Rama castellana ,Iberian Range ,Ordovícico - Abstract
Se revisa la sucesión del Ordovícico Superior al oeste de Noguera de Albarracín (Teruel), identificándose dos horizontes con trilobites y otros fósiles. El más antiguo se sitúa hacia la parte media de la Formación Bronchales y es de edad Berouniense (Sandbiense/Katiense en la escala global), conteniendo trinucleidos (Deanaspis), illaénidos (Vysocania) y dalmanítidos (Dalmanitina). El horizonte siguiente se localiza en la base de la Fm. Caliza de Cistoideos y es de edad Kralodvoriense (Katiense 3-4), con plioméridos (Ovalocephalus) e illaénidos (Cekovia?). El registro de trilobites y braquiópodos del Ordovícico Superior es particularmente escaso en la rama castellana, donde las formas representadas en la Fm. Bronchales permiten la correlación de esta unidad con la Fm. Fombuena de la rama aragonesa. Al N y NO del Macizo del Tremedal, los materiales berounienses no se depositaron (o fueron erosionados) previamente a las unidades calcáreas del Kralodvoriense. La localización del nivel con Deanaspis cf. seunesi permite situar estratigráficamente las citas locales de trinucleidos, mencionados desde mediados del siglo XX pero nunca descritos o figurados, razón por la cual se añade un pequeño apartado sistemático para este taxón, The revision of the Upper Ordovician sequence west of Noguera de Albarracín (Teruel Province) yielded two horizons with trilobites and other fossils. The oldest horizon occurs toward the middle part of the Bronchales Formation and is of Berounian (late Sandbian-early Katian) age, bearing trinucleids (Deanaspis), illaenids (Vysocania) and dalmanitids (Dalmanitina). The youngest studied horizon is located at the base of the Cystoid Limestone Fm. and yielded pliomerids (Ovalocephalus) and illaenids (Cekovia?) of Kralodvorian (Katian 3-4) age. The record of Upper Ordovician fossils in the Castilian branch of the Iberian Range is particularly scarce, and the Bronchales Fm. association now described supports the correlation of this unit with the Fombuena Fm. of the Aragonian branch. Towards the N and NW of the Tremedal inlier, Berounian rocks are absent due to non-deposition or erosion before younger calcareous sedimentation took place. This revision allows to locate a trinucleid trilobite-bearing horizon briefly mentioned in the mid-20th Century but never described or figured. Herein we pinpoint the stratigraphical position of this classical horizon and, due to its importance, present a short systematic section on Deanaspis cf. seunesi
- Published
- 2018
5. Trilobites epipelágicos del Ordovícico de Perú y Bolivia
- Author
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Gutiérrez Marco, Juan Carlos, Rábano Gutiérrez del Arroyo, Isabel, Aceñolaza, Guillermo Federico, and Chacaltana Budiel, César Augusto
- Subjects
Perú ,Bolivia ,Gondwana ,Paleobiogeografía ,Ordovicico ,Paleocorrientes ,Trilobites ,Meteorología y Ciencias Atmosféricas ,CIENCIAS NATURALES Y EXACTAS ,Ciencias de la Tierra y relacionadas con el Medio Ambiente - Abstract
Lostelefínidos espipelágicos son trilobites raros en Sudamérica, donde se conocen pocos ejemplares en elOrdovícico de la Precordillera, la cuenca de Famatina, la Puna oriental y la Cordillera Oriental argentina. En este trabajo se presentan los registros más septentrionales de los géneros Carolinites y Oopsites. El Ordovícico Inferior de la cuenca andina central, procedentes de la Formación Sella del sur de Bolivia(Carolinites genacinaca Ross s.l.) y de la Formación San José del suroeste del Perú (Oopsites sp. nov). El exiguo registro de estos telefínidos se halla vinculado con corrientes de aguas cálidas,que esporádicamente se dirigían hacia el sur a lo largo de lmargen gondwánico, transportando trilobites paleotropicales hacia paleolatitudes más elevadas con aguas templadas a frías. Epipelagic telephinid trilobites rarely occur in the Ordovician of South America, being represented byfew specimens recorded from the ArgentinianPrecordillera, the Famatina Basin, eastern Puna and Cordillera Oriental. We here report the northernmost occurrences of the genera Carolinites and Oopsites in the Central Andean Basin, coming from the Lower Ordovician rocks of the Sella Formation of southern Bolivia (Carolinites genacinaca Ross s.l.) and from the San José Formation of southwestern Peru (Oopsites sp.nov). The scarce record of these telephinids has been related to warm water currents, that sporadically moving southwards along the Gondwanan margin,carrying palaeotropical trilobites into more temperate to cool-‐water higher palaeolatitudes. Fil: Gutierrez Marco, Juan Carlos. Consejo Superior de Investigaciones Científicas; España Fil: Rábano, Isabel. Museo Geominero; España Fil: Aceñolaza, Guillermo Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Correlación Geológica. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Departamento de Geología. Cátedra Geología Estructural. Instituto Superior de Correlación Geológica; Argentina Fil: Chacaltana, César. INGEMMET; Perú
- Published
- 2015
6. Evolution of trilobite enrolment during the Great Ordovician Biodiversification Event: insights from kinematic modelling.
- Author
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Esteve, Jorge, Gutiérrez‐Marco, Juan Carlos, Rubio, Pedro, and Rábano, Isabel
- Subjects
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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
7. 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
8. Fósiles ordovícicos del NO de Adamuz (Córdoba): aportación paleobiogeográfica a la concepción del Iímite entre las Zonas Centroibérica y Ossa Morena durante el Paleozoico
- Author
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Gutiérrez Marco, Juan Carlos, Apalategui, Octavio, and Rábano, Isabel
- Subjects
Central Iberian Zone ,Ossa Morena Zone ,Ordovician ,Hesperian Massif ,Trilobites ,Central-lberian Zone ,Paleontología ,Structural boundary - Abstract
3 páginas, 1 figura.-- Trabajo presentado en la 4ª Sesión Científica, Granada 1987., The Ordovician outcrop at NW Adamuz (Córdoba province), previously regarded as belonging to in the Ossa Morena Zone by some authors, contains several fossiliferous levels of Lower Llanvirn, Upper Llanvirn-Llandeilo and Caradoc (pre-Actonian) age. The Central lberian affinities of the faunas constitute an additional argument for the consideration of the Obejo-Valsequillo-Puebla de la Reina Domain as the southern margin of the Central Iberian Zone during the Paleozoic., Este artículo es una contribución al Proyecto "Bioestratigrafia y Paleocología del Paleozoico inferior del SO, del Macizo Hespérico", financiado por el CSIC-CAICYT.
- Published
- 1987
9. Reprint of: The Bohemo-Iberian regional chronostratigraphical scale for the Ordovician System and palaeontological correlations within South Gondwana.
- Author
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Gutiérrez‐Marco, Juan Carlos, Sá, Artur A., García‐Bellido, Diego C., and Rábano, Isabel
- Subjects
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ORDOVICIAN Period , *ANIMALS , *TRILOBITES , *BRACHIOPODA - Abstract
A reprint of article "The Bohemo-Iberian regional chronostratigraphical scale for the Ordovician System and palaeontological correlations within South Gondwana" published in journal ins presented. The article outlines faunas found in Mediterranean Province such as trilobites, brachiopods, and molluscs; palaeobiogeographical relationships based on the distribution of faunas across South Gondwana; and Ordovician system discovered by Charles Lapworth.
- Published
- 2017
- Full Text
- View/download PDF
10. Hirnantia Fauna from the Condroz Inlier, Belgium: another case of a relict Ordovician shelly fauna in the Silurian?
- Author
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Pereira, Sofia, Colmenar, Jorge, Mortier, Jan, Vanmeirhaeghe, Jan, Verniers, Jacques, Štorch, Petr, Taylor Harper, David Alexander, and Gutiérrez-Marco, Juan Carlos
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BRACHIOPODA , *MASS extinctions , *ABSOLUTE sea level change , *TRILOBITES , *BIOTIC communities , *GLACIATION - Abstract
The end-Ordovician mass extinction, linked to a major glaciation, led to deep changes in Hirnantian–Rhuddanian biotas. The Hirnantia Fauna, the first of two Hirnantian survival brachiopod-dominated communities, characterizes the lower–mid Hirnantian deposits globally, and its distribution is essential to understand how the extinction took place. In this paper, we describe, illustrate, and discuss the first macrofossiliferous Hirnantia Fauna assemblage from Belgium, occurring in the Tihange Member of the Fosses Formation at Tihange (Huy), within the Central Condroz Inlier. Six fossiliferous beds have yielded a low-diversity, brachiopod-dominated association. In addition to the brachiopods (Eostropheodonta hirnantensis, Plectothyrella crassicosta, Hirnantia sp., and Trucizetina? sp.), one trilobite (Mucronaspis sp.), four pelmatozoans (Xenocrinus sp., Cyclocharax [col.] paucicrenulatus, Conspectocrinus [col.] celticus, and Pentagonocyclicus [col.] sp.), three graptolites (Cystograptus ancestralis, Normalograptus normalis, and ?Metabolograptus sp.), together with indeterminate machaeridians and bryozoans were identified. The graptolite assemblage, from the Akidograptus ascensus-Parakidograptus acuminatus Biozone, indicates an early Rhuddanian (Silurian) age, and thus, an unexpectedly late occurrence of a typical Hirnantia Fauna. This Belgian association may represent an additional example of relict Hirnantia Fauna in the Silurian, sharing characteristics with the only other known from Rhuddanian rocks at Yewdale Beck (Lake District, England), although reworking has not been completely ruled out. The survival of these Hirnantian taxa into the Silurian might be linked to delayed post-glacial effects of rising temperature and sea-level, which may have favored the establishment of refugia in these two particular regions that were paleogeographically close during the Late Ordovician–early Silurian. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
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