Some molluscs from the Badenian (Middle Miocene) west of Pleven (Central Northern Bulgaria). I. Gastropoda: orders Archaeogastropoda and Mesogastropoda

Pages: 
pp. 61-72
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Abstract: 

Thirteen taxa of the species group undescribed up to now in Bulgaria are described in this paper. They belong to 9 genera and 9 families of Archaeogastropoda and Mesogastropoda orders. The species were found in outcrops exposed along the right bank of Vit River to the west of the town of Pleven between the villages of Târnene and Bivolare. Only Late Moravian (foraminiferal zone Orbulina suturalis) and Wielichkian (foraminiferal zone Uvigerina) sediments of the Badenian regional stage are exposed in this area. Despite its diversity and facial characteristics, the gastropoda fauna is not stratigraphically tied and therefore does not appear as an indication for the Early Badenian age of these deposits. The similarity of most taxa with those from the Vienna Basin is an evidence of parallelism of their development.

П. И. Николов. Некоторые моллюски из бадена (средний миоцен) западнее города Плевена (Центральная Северная Болгария). В статье впревые описываются 13 таксонов видовой группы бадена Болгарии. Они принадлежат к 9 родам и 9 семействам отрядов Archaeogastropoda и Mesogastropoda. Найдены в обнажениях между с. с. Тырнене и Биволаре, находящихся вдоль правого берега р. Вит в западном направлении от города Плевена. Здесь разкрываются только позднеморавские (фораминиферовая зона Оrbulina suturalis) и величские (фораминиферовая зона Uvigerina) отложения баденского регионального яруса. Гастроподовая фауна является только фациальной, но не стратиграфически характерной. Сходство многих таксонов с таковыми из Венского бассейна указывает на параллелизм в их развития.

VOLUME 23 (6)/December 1993

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

Department of Geology and Paleontology, Sofia University, 1000 Sofia
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Laboratory of Physicogeological reserach, Institute of Oceanology, Russian Academy of Sciences, 117218 Moscow
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Laboratory of Geomagnetism, Institute of Earth's Physics, Russian Academy of Sciences, 121810 Moscow
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Laboratory of Geomagnetism, Institute of Earth's Physics, Russian Academy of Sciences, 121810 Moscow

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Universite Bl. Pascal, 63038 Clermont-Ferrand, France

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

Laboratory for Mineral Waters Research, NCBPR, 1618 Sofia
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Laboratory of Engineering Geology, Aristotle University of Thessaloniki, 54006 Thessaloniki