Upper Jurassic zonation on cadosinids, stomiosphaerids and calpionellids of the Central Forebalkan, Bulgaria

Pages: 
pp. 33-47
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Abstract: 

This paper presents the biostratigraphic data on the cadosinid, stomiosphaerid and calpionellid occurrence in the Javorets, Gintsi, Glozhene, Glozhene-Neshkovtsi and Glozhene-Cherniosum Formations from the Lower Oxfordian to the lowermost parts of the Berriasian in the Central Forebalkan, Bulgaria. The stratigraphic ranges of the cadosinid, stomiosphaerid and calpionellid species in three sections have been studied in detail and illustrated. The Colomisphaera fibrata, C. fibrata – Cadosina parvula, C. parvula – Stomiosphaera moluccana, S. moluccana – Carpistomiosphaera borzai, C. borzai, Parastomiosphaera malmica, Colomisphaera cieszynica – Colomisphaera tenuis, Chitinoidella, Praetintinnopsella, Crassicollaria and Calpionella zones and Calpionella alpina and Remaniella Subzones have been established and described. The cadosinid, stomiosphaerid and calpionellid zonation of the Central Forebalkan has been correlated with the zonations of different authors in the Mediterranean region.

Д. Иванова. Верхнеюрское зонuрованuе на базе кадозuнuд, стомuосферuд u кальnuонеллuд в Центральном Предбалканье, Болгария. В настоящей работе пред ставлены биостратиграфические данные относительно распространения кадозинид, стомиосферид и кальпионеллид в известняках Яворецкой, Гинской, Гложенской, Гложенско-Нешковской и Гложенско-Черниосымской свит в разрезах в Центральном Предбалканье, охватывающих интервал от нижнего оксфордского подъяруса до самых нижних частей берриасского яруса. Детально исследовано и проиллюстровано стратиграфическое распространение этих микрофоссильных микроорганизмов в трех разрезах. Установлены и описаны следующие зоны: Colomisphaera fibrata, С. fibrata – Cadosina parvula, С. parvula-Stomiosphaera moluccana, S. moluccana – Carpistomiosphaera borzai, С. borzai, Parastomiosphaera malmica, Colomisphaera cieszynica – Colomisphaera tenuis, Chitinoidella, Praetintinnopsella, Crassicollaria и Calpionella и подзоны Calpionella alpina и Remaniella. Зонирование на основе кадозинид, стомиосферид и кальпионеллид в Центральном Предбалканье сопоставлено с зонированиями других авторов в Медитерранской области.

Keywords: 

Upper Jurassic, zonation, cadosinids, stomiosphaerids, calpionellids, Central Forebalkan, 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