These images are of Myliobatus striatus? (Eagle Ray) fossils on display at Mace Brown Museum of Natural History (August 2017). They date to the Eocene Epoch (about 50-45 million years ago), Paleogene Period. The fossil was found in Santee Quarry, Harleyville, South Carolina USA.
The Mace Brown Museum of Natural History is located at the College of Charleston, 202 Calhoun Street, 2nd Floor, Charleston, South Carolina 29424.
Learn more at their blog: http://blogs.cofc.edu/macebrownmuseum/
