Inter-regional correlation of Jurassic/Cretaceous boundary strata based on the Tithonian-Valanginian dinoflagellate cyst biostratigraphy of the Volga Basin, western Russia

►Correlation of Jurassic/Cretaceous in Boreal Province using ammonites is problematic. ►Marine palynology of Gorodishche & Kashpir sections, western Russia is investigated. ►A dinoflagellate cyst interval zonation is defined for the Volga Basin. ►Graphic correlation of data identifies stratigraphic gaps in both Russian localities. ►Dinoflagellate cysts correlate NW Europe with western Russia better than ammonites.