Pecten fossils are the preserved shells of extinct scallops, a type of marine mollusk that lived in ancient oceans. They are easily recognized by their fan-shaped shells with distinctive radiating ribs. These fossils are common in sedimentary rocks and provide valuable evidence about past marine environments, climate, and the evolution of sea life.

This slab of Pecten fossils originates from Lacoste, France, and is approximately 20 million years old, dating back to the Miocene Epoch.