Toarcian and Aalenian ammonites in a part of the Western Stara Planina Mts., Bulgaria (taxonomy, stratigraphy)

Pages: 
pp. 3-31
Sofia University "St. Kliment Ohridski", Tsar Osvoboditel Blvd., 15, 1000 Sofia, Bulgaria
Abstract: 

This paper presents biostratigraphic data on the Toarcian and Aalenian ammonites in the clayeycalcareous and marly sediments of the Boukorovtsi Member of the Ozirovo Formation and Etropole Formation in a part of the Western Stara Planina Mts. Harpoceras falciferum, Hildoceras bifrons, Haugia variabilis,Grammoceras thouarsense, Dumortieria levesquei, Dumortieria moorei, Pleydellia aalensis, Ludwigia murchisonae and Graphoceras concavum Zones have been established and described. That zonal scheme has been correlated to the zonations of different authors in the North-West Europe. About 40 species of 18 genera, refereed to the families Phylloceratidae, Dactylioceratidae, Hildoceratidae and Graphoceratidae have been determined and 24 of them have been established or described at first in Bulgaria. The boundary between the Toarcian and Aalenian has been biostratigraphically traced.

 Л. Методиев. Тоарские и ааленские аммониты в части Западной Старой планины (таксономия, стратиграфия). В этой работе изложены данные о биостратиграфическом распространении тоарских и ааленских аммонитов в глинисто-известняковых отложениях Озировской свиты, принадлежащей к Букоровскому члену, и в пелитовых седиментах Етропольской свиты в части Западной Старой планины. Установлены и описаны следующие аммонитные зоны: Harpoceras falciferum, Hildoceras bifrons, Haugia variabilis, Grammoceras thouarsense, Dumortieria levesquei, Dumortieria moorei, Pleydellia aalensis, Ludwigia murchisonae. Graphoceras concavum. Эта зональная схема сопоставлена со схемами других авторов в Северо-Западной Европе. Определены были 40 аммонитные виды 18 родов, принадлежащие семьям Phylloceratidae, Dactylioceratidae, Hildoceratidae и Graphoceratidae, 24 из которых установлены или описаны в первый раз в Болгарии. Биостратиграфическим образом была поставлена граница между тоарским и ааленским ярусами в исследованной области.

Keywords: 

Jurassic (Toarcian, Aalenian) ammonites, taxonomy, biostratigraphy, Bulgaria

VOLUME 27 (3-4)/December 1997 50th Anniversary of the Geological Institute, Bulgarian Academy of Sciences

Sofia University "St. Kliment Ohridski", Tsar Osvoboditel Blvd., 15, 1000 Sofia, Bulgaria

Department of Geology, University of Thessaliniki, 540 06 Thessaloniki, Greece
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IGME, 1 Frangon str., 546 26 Thessaloniki, Greece

Department of Geography and Climatology, University of Athens, 157 84 Zografou, Greece
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Department of Geography and Climatology, University of Athens, 157 84 Zografou, Greece

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Uniwersytet “A. Mickiewicz” 61606 Poznan
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Instytut paleontologii, Polska Akad. Nauk, 02089 Warszawa
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Uniwersytet Wroclawski, 50355 Wroclaw

National Museum of Natural History, Academy of Sciences, 1000 Sofia, Bulgaria

Institute of Geology and Mineral Exploration, 70, Messoghion Street, GR-11527 Athens
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University of Athens, Department of Geology, GR-15584 Athens
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University of Athens, Department of Geology, GR-15584 Athens

Chair of Applied Geophysics, University of Mining and Gelogy, 1156 Sofia
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University of Mining and Gelogy, 1156 Sofia
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University of Mining and Gelogy, 1156 Sofia

Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria