These images are of Hexanchus agassizi fossil shark teeth on display at Mace Brown Museum of Natural History (August 2017). This animal was also known as a cow shark. They date to the Eocene Epoch (about 45 million years ago), Paleogene Period. The fossils were found in 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/
