From Ohio History Central
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In Ohio, flint occurs in nodules or beds in Devonian limestones and particularly in Pennsylvanian limestones. It is thought that the silica was derived from the siliceous spicules of sponges. The most conspicuous bed of flint is associated with the Pennsylvanian-age Vanport limestone at Flint Ridge in Licking and Muskingum Counties. Although most flint is gray or black in color, Flint Ridge flint is characterized by its light color with hues of red, green, yellow, and other colors. Flint was quarried by Native American cultures for spear points, knives, scrapers, and other functional and ceremonial objects. Today, collectors polish Ohio flint into colorful jewelry. The aboriginal quarries and displays of Flint Ridge flint are visible at Flint Ridge State Memorial.
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