This image is of Hexanchus gigas fossil shark teeth on display at Mace Brown Museum of Natural History (August 2017). This extinct animal was also known as a sixgill cow shark. It dates to the Pliocene Epoch (about 2 million years ago), Neogene Period. The fossils were found in Huarra Formation (Caldera Site) Atacama Desert, Copiapo, Chile.
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/