<page_title> List of Global Boundary Stratotype Sections and Points </page_title> <section_title> Jurassic </section_title> <table> <cell> Pliensbachian <col_header> Epoch </col_header> </cell> <cell> 190.8 <col_header> Stage </col_header> </cell> <cell> Biologic: First appearance of Bifericeras donovani and genera Apoderoceras (Ammonite). <col_header> GSSP location </col_header> </cell> </table>
Global Boundary Stratotype Sections and Points has the First Appearance of Apoderocerasas and of Bifericeras donovani the defining biological marker of the Pliensbachian Stage of the Jurassic, 190.8 years.