<page_title> List of Global Boundary Stratotype Sections and Points </page_title> <section_title> Cretaceous </section_title> <table> <cell> Aptian <col_header> Epoch </col_header> </cell> <cell> 125 <col_header> Stage </col_header> </cell> <cell> Magnetic: Base of magnetic polarity chronozone M0r. Biologic: Near first appearance of Paradeshayesites oglanlensis (Ammonite). <col_header> GSSP location </col_header> </cell> </table>
The First Appearance of Paradeshayesites oglanlensis as the defining marker for the Aptian Stage of the Cretaceous was 125 million years ago.