Rare myodocopid ostracods from the Lower Cretaceous (Albian) strata of Vértes Foreland (NW-Hungary)

Cséfán, Tünde and Tóth, Emőke (2013) Rare myodocopid ostracods from the Lower Cretaceous (Albian) strata of Vértes Foreland (NW-Hungary). Hantkeniana, 8. pp. 25-35. ISSN 1219-3933

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Abstract

Occurrences of myodocopid ostracods in fossil record particularly in Mesozoic sequences are very scarce because of preservation potential of their carapaces, despite that Recent forms occur worldwide in various water depths of marine environments as benthic, nektobenthic or planktonic organisms. Two myodocopid ostracod genera (“Conchoecia” and Polycope) belonging to two families Halocyprididae and Polycopidae were identified from the studied Lower to Middle Albian successions of the boreholes Agt-2 and Vst-8. These occurrences from Vértes Foreland of Hungary are one of the earliest representatives of halocyprid ostracods. These data completed the palaeobiogeographical distribution of the described genera during the Albian in the Tethys Ocean. The previous paleoenvironmental reconstructions based on planktonic and benthic foraminifera faunas in the studied boreholes confirmed the same ecological requirement of Cretaceous halocyprid forms as that of their living relatives. The depositional environment of Vértessomló Siltstone is shallow bathyal semi-enclosed basin with high organic matter input and dysoxic conditions allowing the preservation of these rare forms.

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