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Three planktonic biofacies successions are recognized in the Upper Jurassic and Cretaceous in the Western Black Sea, offshore Romania. Biofacies A (Oxfordian-Valanginian) contains rare Globuligerina tests in punctual occurrences. The planktonic foraminifera are recorded in carbonate inner-shelf deposits in the Upper Jurassic, and mixed (detrital, clayey, marly) shelf deposits in the Berriasian-Valanginian. The first records of the Western Black Sea opening are dated as Valanginian. Biofacies B largely corresponds to the turbiditic interval of the late Albian–Cenomanian. The planktonic foraminiferal assemblages consist of both primitive (globular chambered) and morphologically advanced taxa (keeled Rotalipora and Praeglobotruncana). The planktonic record...

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