English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/29697
Share/Impact:
Statistics
logo share SHARE   Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

New findings of trilobites and graptolites in the Ordovician of Bulgaria

Other TitlesNovi nahodki na trilobiti i graptoliti v ordovika na Bulgaria
AuthorsGutiérrez-Marco, J. C. ; Yanev, Slavcho N.; Sachanski, Valeri V.; Rábano, I.; Lakova, Iskra
KeywordsOrdovician
Bulgaria
Trilobites
Graptolites
Biostratigraphy
Correlation
Gondwana
Issue Date2002
PublisherBulgarian Academy of Sciences
CitationReview of the Bulgarian Geological Society 63(1-3): 51-58 (2002)
AbstractDarriwilian 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.
Description8 páginas, 2 figuras, 1 lámina.
Publisher version (URL)http://www.bgd.bg/REVIEW_BGS/frames_home_EN.html
URIhttp://hdl.handle.net/10261/29697
ISSN0007-3938
Appears in Collections:(IGE) Artículos
Files in This Item:
File Description SizeFormat 
07_Karlos.pdf14,14 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.