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— Cretaceous calcareous nannoplankton was studied in the Lower Cretaceous Rezanaya and Biasala and Upper Cretaceous Belogorsk, Prokhladnoe, and Kudrino formations of the Bakhchisarai region of the southwest Crimea. The age of the host rocks was refined according to calcareous nannoplankton. No nannoplankton zone was identified in the Rezanaya Formation; the Biasala Formation probably contains part...
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