New Data on Planktonic Foraminifera and Ostracods from the Barremian(?)–Aptian of the Eastern Crimea: Stratigraphy and Paleoecology

Abstract

Abstract—: Planktonic foraminifera and ostracods of the upper Barremian(?)–lower Aptian of the Kokluk section (eastern Crimea) are studied. Three interval-zones are established based on foraminifera: Globigerinelloides blowi, Hedbergella ruka and H. excelsa. Beds with H. ruka are described as a zone. Based on ostracods, Robsoniella minima–Loxoella variealveolata Zone and Beds with Cytheropteron tesakovae are determined. An interval possibly corresponding to OAE 1a is recognized. The species C. tesakovae is described as new. The Kokluk section is correlated with the coeval Verkhorechie (southwestern Crimea) and Zavodskaya Balka (eastern Crimea) sections. The Kokluk section is analyzed paleocologically.