SARMATIAN FORAMINIFERAL ASSEMBLAGES OF CAVERN FILLINGS IN THE BADENIAN REEFS OF MEDOBORY (POLUPANIVKA, WESTERN UKRAINE)
Journal Title: Biuletyn Państwowego Instytutu Geologicznego - Year 2012, Vol 449, Issue 449
Abstract
The Middle Miocene (Upper Badenian) coralline algal reefs of Western Ukraine contain caverns (up to 1 m across) and fissures that are filled by Sarmatian deposits: marly clays, clayey carbonate sand and bioclastic, bryozoan-rich sand. These deposits often contain abundant and very well preserved calcareous benthic foraminifera; agglutinated forms have not been recorded. Foraminiferal tests quite commonly show morphological abnormalities, e.g. twin forms or tests with irregularities in size or shape in last chambers. Each of the three analysed samples is characterized by a different foraminiferal assemblage: Elphidium aculeatum assemblage, Hauerinidae assemblage and Lobatula lobatula assemblage. These assemblages are characteristic for a shallow marine environment. Low taxonomic diversity and high dominance or monospecific foraminiferal assemblages indicate generally a restricted marine environment. It seems that the increasing salinity and very high-energy environment were the most probable factors controlling the composition of the foraminiferal assemblages.
Authors and Affiliations
Danuta PERYT, Marek JASIONOWSKI
Keywords
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