The pre-Clovis artifacts include more than 90 stone tools, such as bifaces and blades, and more than 160,000 flakes left over from the point-making process. (Photo courtesy Gault School of Archaeological Research)
Trivia Fact: There is no Flint in Flint, Michigan.
Michigan is one big glacial deposit, and flint was not part of the geological mix.
Archaeologists think the arrowheads found along the Flint River were made from stone gleaned near Coshocton, Ohio and carried back by the natives (who would travel as far as present-day Pittsburgh on hunting expeditions).
(I only know this cause I used to live there)