Vore Buffalo Jump in northeastern Wyoming is an archaeological site centered on a natural sinkhole, about 40 feet deep and 200 feet across, that served for centuries as a communal bison kill and butchering place. Used from about 1500 to 1800 AD, it reflects the wider buffalo jump tradition of the northern Great Plains and southern Canada. Stone tools indicate use by Kiowa and Apache groups during southward migrations, followed by Shoshone, Hidatsa, Crow, and Cheyenne. Discovered during Interstate 90 construction in the early 1970s, it yielded immense deposits of bones and projectile points, with the sinkhole estimated to hold remains of around 20,000 buffalo.