true Base of Bed 73b Ratified 2005 Episodes 29/2, p.93 106, 2006 Location of Stratotype Point Base of Pliensbachian Wine Haven, Robin Hoods Bay, Yorkshire Coast, England Stratotype Point Base of Pliensbachian Ammonite association of Bifericeras donovani and Apoderoceras sp. Stratotype Point Base of Pliensbachian