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I did not know that Flint Ridge was so widely traded/carried. I may be a little better at recognizing it now. Here's an excerpt from a Wiki article about it followed by a link that references the complete article.
"During the Stone Age, access to flint was so important for survival that people would travel or trade to obtain flint. Flint Ridge in Ohio was an important source of flint and Native Americans extracted the flint from hundreds of quarries along the ridge. This "Ohio Flint" was traded across the eastern United States and has been found as far west as the Rocky Mountains and south around the Gulf of Mexico."
https://en.wikipedia.org/wiki/Flint
Thanks again Mike.