Abundant belemnites and bivalves from the Middle Volgian-Ryazanian the Kashpir section (Middle Volga Basin, Russia) were studied. Belemnite assemblages are typically Subboreal. Here, from the base upwards, the following biostratigraphic units based on belemnites were recognized: Lagonibelus magnificus Beds, Eulagonibelus rosanovi Beds, E. volgensis Beds, Liobelus russiensis Acroteuthis mosquensis Beds, Liobelus lateralis Beds, and Acroteuthis explanatoides Beds. The studied bivalve assemblages are mainly represented by both typically Boreal and Subboreal forms. The following beds and zones based on Buchia are established in the Kashpir section: B. russiensis-mosquensis Beds, B. terebratuloides Zone, B. obliqua Zone, B. unschensis Zone, B. volgensis Zone, B. okensis Zone, B. jasikovi Zone, and B. tolmatschowi Zone. In general, the above-mentioned buchiid succession repeats that of the Boreal standard. A brief review is presented of belemnite and buchiid zonations in the Kashpir section and their application to successions in other Boreal regions.