This is a polished slab of rock containing multiple Orthoceras fossils, which are extinct "straight-shelled" cephalopods. These fossils are typically found in limestone deposits in the Atlas Mountains of Morocco. They lived during the Ordovician period, approximately 480-443 million years ago. The name Orthoceras means "straight horn," referring to their long conical shells. The fossils have been polished to reveal their inner segmented chambers. 10 specimen nautiloid fossil art