The purpose of this master's thesis was to determine the ostracod assemblage, paleoenvironmental conditions and age of the Bizeljsko Formation in the Krško Basin. To fulfill this task, a 43 meters thick section of the formation in the Bizeljsko area was investigated. The determined ostracods belong to the families Cyprididae, Cytheridae, Darwinulidae and Loxoconchidae. In total, 36 species were identified. Six morphotypes were determined at the genus level. Two morphotypes of the carapaces could not be determined due to poor preservation. The most common genera are Candona, Hemicytheria, and Cyprideis. The assemblage belongs to the Candona (Caspiocypris) labiata biozone from the upper Pontian. Based on the ostracode community, the environment is defined as estuarine with occasional frashwater conditions. Water salinity is estimated at 5-30 ‰.
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