Out Of The Blue Artifacts A Library of a lifetime of collecting
Micraster Sea Urchin.
Micraster Sea Urchin (the featured image above) shows the top surface of the Micraster.
The image (left) shows the underside that was attached to the sea-bed.
Fossil size 2 1/2″ x 2 1/2″ inches.
The Cretaceous Period – 150 million years ago to recent.