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The various rocks called "flint" (mainly chert and chalcedony - impure forms of quartz) are found in several locations in Ohio: Flint Ridge, near Newark being the most famous ("flint" from there was traded over a vast area of what is now the U.S. and Canada.), and also at locations in Vinton, Jackson, Coshocton, Hocking, and Perry counties -- maybe some others as well.
"Flint" is found as coated nodules (rounded lumps) in limestone and chalk. The former explains finding it in road gravel since limestone is the most common road gravel used in Ohio. Lots of limestone in Ohio!
There was, last I checked, at least one commercial quarry in the Newark area.
Any fairly glass-like rock can be tried for striking sparks from steel.
"Flint" is found as coated nodules (rounded lumps) in limestone and chalk. The former explains finding it in road gravel since limestone is the most common road gravel used in Ohio. Lots of limestone in Ohio!
There was, last I checked, at least one commercial quarry in the Newark area.
Any fairly glass-like rock can be tried for striking sparks from steel.