Dinoflagellate cysts and acritarchs from the Jurassic-Cretaceous boundary, northwest Anatolia, Turkey

摘要

This paper presents the results of the first detailed study of organic microplankton assemblages from the Bilecik Forma- tion (Middle-Upper Jurassic-Lower Cretaceous). The Bilecik Formation is exposed in northwest Anatolia, Turkey. Seventy-sevena sam- ples were analysed for organic microplankton. Although the resultant assemblages are varied, the species are represented in low numbers and their preservation is generally poor. A total of 97 species and subspecies of dinoflagellate cysts and acritarchs are recorded, Seventy- three species have been previously reported from the Middle and Upper Jurassic, fourteen other species were recorded for the first time in the Jurassic. Pollen and spores are abundant and varied.