The results of integrate biostratigraphic study Upper Jurassic deposits the clay pit near village Valy (Syzran district, Samara region) are presented. For first time a bed-by-bed description was made and subdivision section into zones, subzones biohorizons by ammonites established. Bauhini Kitchini zones (Bayi subzone) established in Lower Kimeridgian, while Kimmeridgian is represented Autissio...

Abstract This study focuses on a condensed sequence of alternating carbonate–clastic sediments the Barrington Member, Beacon Limestone Formation (latest Pliensbachian to early Toarcian) from Somerset (SW England). Abundant ammonites confirm (apart absence Clevelandicum and Tenuicostatum ammonite subchronozones) presence Hawskerense Subchronozone Fallaciosum–Bingmanni subchronozones. Well-preser...

The Aptian sedimentary deposits of the Castro Urdiales area in north Spain record an episode disoxia/anoxia which postdates Oceanic Anoxic Event 1a (OAE 1a). Carbonate platform and overlying facies are analysed for stratigraphy, sedimentology, total organic carbon isotopes. Lower shallow-water limestones covered by deeper-water marlstones organic-carbon-rich black lutites lower to upper Aptian,...