2" Jurassic Sea Urchin (Collyrites) Fossil - Great Britain
This is a sea urchin fossil of the species Collyrites bicordata, collected from Great Britain. It's upper Jurassic, Oxfordian Stage in age, or approximately 260 million years old.
Sea urchins are a type of echinoderm which are still living relatively unchanged today. They live at the bottom of soft ocean floors and have long spines protruding from their central body. They move along the bottom of the ocean using many small feet while feeding on various plant and animal matter.
2" (longest measurement)