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58. New biostratigraphical data from the Ordovician of Bulgaria

Author

Gutiérrez-Marco, J. C., Yanev, Slavcho N., Sachanski, Valeri V., Rábano Gutiérrez del Arroyo, Isabel, Lakova, Iskra, San José, M. A. de, Díaz-Martínez, Enrique, Boncheva, Iliana, and Sarmiento, Graciela N.

Subjects
Lithostratigraphy, Ordovician, Biostratigraphy, Bulgaria, Correlation
Abstract

7 páginas, 2 figuras.-- Edited by: G. L. Albanesi / M. S. Beresi / S. H. Peralta.-- Proceedings of the International Symposium on the Ordovician System. San Juan - Argentina 2003.

Published
2003

60. New findings of trilobites and graptolites in the Ordovician of Bulgaria

Author

Gutiérrez-Marco, J. C., Yanev, Slavcho N., Sachanski, Valeri V., Rábano Gutiérrez del Arroyo, Isabel, and Lakova, Iskra

Subjects
Gondwana, Ordovician, Biostratigraphy, Bulgaria, Trilobites, Graptolites, Correlation
Abstract

8 páginas, 2 figuras, 1 lámina., Darriwilian trilobites and graptolites from the Grohoten Formation (Svoge anticliorium, Sofia Stara Planina Mountain) are reviewed in the light of the new records and by direct examination of the original material reported by previous authors between 1934 and 1958 years. Middle Ordovician fossils are distributed in three stratigraphically successive assemblages. The oldest one derives from Lower Oretanian shales with nodules and consists of pendent and extensiform didymograptids (Didymograptus cf. artus, D. cf. spinulosus, D. s.l. ferrugineus), some biserials (Haddingograptus ?), a single benthic atheloptic trilobite (Placoparia balcanica n. sp.), and probably also of rare pelagic form Cyclopyge cf. kossleri. The middle assemblage which is dominated by pelagic trilobites such as Pricyclopyge binodosa binodosa, R binodosa prisca and Microparia sp., and sparse benthic elements (Ectillaenus sp.), is recorded from siltstones and silty shales that directly overlie a variously developed middle, quartzitic member. The presence both of the graptolite Didymograptus murchisoni and the rare biserial forms confirm an Upper Oretanian age for the association. Finally, the third and youngest Middle Ordovician palaeontological horizon is characterized by the occurence of the Dobrotivian cyclopygid trilobite Pricyclopyge binodosa longicephala, which derives from the settled shales and is located well below the latest assemblage of trilobites and brachiopods already of Berounian (Upper Ordovician) age. Closest comparisons of the Bulgarian trilobites are with the cyclopygid biofacies from the deep outer shelf settings of the peri-Gondwanan platform, shown by the record of some typical Bohemian taxa as P. binodosa prisca and P. binodosa longicephala., Proyectos: Nº 2001BG0005, 2001-2002. 602/1996 y 410 de PIGS (IUGS-UNESCO).

Published
2002

68. New age data from the tectonostratigraphic units of the Istranca “Massif” in NW Turkey: a correlation with SE Bulgaria

Author

Bedı, Yavuz, primary, Vasilev, Emil, additional, Dabovski, Christo, additional, Ergen, Alı, additional, Okuyucu, Cengız, additional, Doğan, Adıl, additional, Tekın, U. Kağan, additional, Ivanova, Daria, additional, Boncheva, Iliana, additional, Lakova, Iskra, additional, Sachanski, Valeri, additional, Kuşcu, İsmaıl, additional, Tuncay, Ercan, additional, Demıray, D. Gülnur, additional, Soycan, Havva, additional, and Göncüoğlu, M. Cemal, additional

Published
2013
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72. Ordovician graptolites from the basal part of the Palaeozoic transgressive sequence in the Karadere area, Zonguldak Terrane, NW Turkey.

Author

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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