Roger Weller, geology instructor
firstname.lastname@example.org copyright 2011-R.Weller
St. Marys Formation, Calvert Cliffs State Park, Maryland
This is how the shell was dug out, filled with dirt and shells.
Width is 10 cm.
Photo is copyright free for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.
Fossil and identification courtesy of Larry Hampton