Roger Weller, geology instructor
wellerr@cochise.edu copyright 2011-R.Weller
Mactra clathrodon-1
St. Marys Formation, Miocene.Calvert Cliffs State Park, Maryland
mactra
25
Photo is copyright free for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.
Fossil and identification courtesy of Larry Hampton