This image is of some fossil teeth of the Mako shark aka Isurus hastalis (Agassiz, 1843) 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 rivers of South Carolina (S.C.), Ridgeville, S.C. and Aurora North Carolina, USA. It appears the genus was renamed in 2021 to Cosmopolitodus (Glikman, 1964) an extinct mackerel shark.
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/