This image is of some fossil teeth of the extinct White shark aka Carcharodon hubelli (Ehret, 2012) on display at Mace Brown Museum of Natural History (August 2017). It dates to the Miocene Epoch (about 5-15 million years ago) of the Neogene Period. The fossils were found in the rivers of 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/