PEN-ORTHPT-01 Origin: Morocco Grade: A Dimensions: Approximately 40-60mm Weight: Approximately 10g Origin: Morocco Grade: A = good Drilled orthoceras of approximately 20-30mm delivered with a waxed cotton cord Patterns and colors may vary from one stone to another. Orthoceras lived during the Paleozoic era, from the Ordovician about 470 million years ago until the end of the Permian when they disappeared during the great Permian-Triassic extinction about 252 million years ago. Orthoceras were univalve shell cephalopods, like their distant cousins the nautiluses today, but the shell of orthoceras was straight, hence their name.