Note to RD Powell: Not that I've ever heard of. We have a-plenty of chert in the Hill Country, but if there's flint in the Piney Woods I'd be surprised. Hereabouts, I-35 roughly parallels the edge of the Edwards Plateau between San Antonio and Austin (and points north), and that has been a source of flint since recorded time. Early tribes of locals made a good thing out of trading flint and flint tools to other tribes north and east. I've got flint (chert). What I seem to lack is knapping skills. I've found through (literally) painful experience that I can turn several pounds of likely flint nodes into useless scrap quickly and reliably, with a few nicks and scars on my paws to help me remember the experience. It's a natural talent, much like my inletting which usually looks like I did it with a tomahawk.