Description, comparison and biostratigraphy of the nonmarine Neogene diatom floras from Southern Bulgaria

Pages: 
pp. 57-81
Departament of Botany, Biological Faculty, Sofia University, Sofia 1000
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Abstract: 

The diatom flora from Neogene lake basins in South Bulgaria is summarized and analysed. It consists of 627 species, varieties and forms, wich are distributed as follows: 459 species, 141 varieties and 27 forms (with uncleared nomenclature are 32 species). The species are referred to 51 genera, 23 families, 7 orders and 2 classes. During the Late Miocene - Early Pliocene in the South Bulgarian basins two types of diatom floras developed: I. "Aulacoseira species" type (The floras from Gotse Delchev, Elhovo and Palakariya Basins) and II. "Actinocyclus species" type (The floras from Sofia and Karlovo Basins). Specific type for the Southbulgarian palaeobasins is the "Actinocyclus species" type. The Actinocyclus species as a component of the Miocene floras, are very widespread (China, Far East, Siberia, Europe and North America), but development during the Late Miocene of various species Actinocyclus massively overlapped was observed only in South Bulgaria and to some extent in the Balkan Peninsula.

Д. Темнискова-Топалова, Н. Огнянова-Руменова. Опuсание, сравнение и биосmраmиграфия пресноводных диатомовых флор Южной Болгарии. Обобщена и анализирована диатомовая флора неогеновых озерных бассейнов в Южной Болгарии. Флора состоит из 627 видов, 141 разновидностей и 27 форм. Виды относятся к 51 роду, 23 семействам, 7 разрядам и 2 классам. В позднем миоцене и раннем плиоцене в Южноболгарских бассейнов развиваются два типа диатомовых флор: Аулакозирный тип (флора Гоцеделчевского, Елховского и Палакарийского бассейна) и Актиноциклусовый (флора Софийского и Карловского бассейнов). Специфическим типом для Южноболгарских палеобассейнов является актиноциклусовый тип. Виды Actinocyclus известные как представители миоценекой флоры, широко распространены в Китае, на Дальнем Востоке, в Сибире, Европе и Северной Америке, но массовое развитие в позднем миоцене разнообразных видов Actinocyclus установлены только в Болгарии в некоторых других областях Балканского полуострова.

Keywords: 

Late Miocene (Pontian), Early Pliocene (Dacian), continental sediments, diatom biostratigraphy

VOLUME 27 (1-2)/August 1997 50th Anniversary of the Geological Institute, Bulgarian Academy of Sciences

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

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

Strumiška 96, 11000 Beograd
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Ministry of Mining and Energetics, rovinjska 12, 11050 Beograd

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

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

Department of Geology and Palaeontology, Sofia University "St. Kliment Ohridski" 15 Tsar Osvoboditel Blvd., 1504 Sofia, Bulgaria

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

Department of Geology, University of Patras, 26110, Greece
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Department of Geology, University of Patras, 26110, Greece
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Department of Geology, University of Patras, 26110, Greece
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Department of Geology, University of Patras, 26110, Greece

Departament of Botany, Biological Faculty, Sofia University, Sofia 1000
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

University of Patras, Department of Geology, 26110 Patras, Greece
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University of Patras, Department of Geology, 26110 Patras, Greece

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

Geology and Geography Faculty, Sofia University "St. Kliment Ohridski" 15 Tsar Osvoboditel Blvd., 1504 Sofia, Bulgaria
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Geology and Geography Faculty, Sofia University "St. Kliment Ohridski" 15 Tsar Osvoboditel Blvd., 1504 Sofia, Bulgaria
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Geology and Geography Faculty, Sofia University "St. Kliment Ohridski" 15 Tsar Osvoboditel Blvd., 1504 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria