The GSSP is a site of world geological interest (geosity), as it represents the reference standard for the definition of the chronostratigraphic limit between the Rupelian plan with the Cattiano plan, the two stratigraphic planes in which the oligocene era is subdivided. 69 GSSPs have been ratified all over the world; the GSSP (Global Stratotype Section and Point) of Mount Cagnero in Urbania is among the 10 GSSPS recognized in Italy. After 15 years of thorough research made by an international group co-ordinated by Professor Rodolfo Coccioni, Paleontologist at the University of Urbino, and by Prof. Alessandro Montanari, director of the Geological Observatory of Coldigioco, on 29 September 2016 the IUGS (International Union of Geological Sciences) awarded Mount Cagnero, near Urbania, with the prestigious GSSP "nail of gold".