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Oh definitely unclemac they would use things that were handy and at hand and could be adapted to use for the task without a whole lot of modification. Hard to spot those, and at least the rock D.E.A.P has was found in association with other known artifacts, but probably still just a rock. As heavy and cumbersome as they would have been before the horse, we have found granite grinding basins in SW Oklahoma up to a hundred miles from the source of that rock, so there is some evidence they carried these with them in their travels. They were highly prized and preferred over the local sandstone available. (If you ever get the chance to examine a prehistoric burial, note the grinding and wearing down of the teeth. This is a lot due to eating food that had been ground up on a sandstone basin.) A tip for everybody looking over old Indian campsites, turn over every larger flat rock you see. We found many instances where these were grinding basins turned upsided down to protect the grinding surface, as they intended to use these if they ever returned. Thinking of offbeat tips, if you have a village site that is presently in a plowed field, and it's been farmed for a long time, always walk the fence row. Those old farmers would toss big rocks there out of the field to keep from damaging the plow. One village site in northern Caddo County OK we observed a plethora of manos, metates, hammerstones, anvils, core stones, etc., that had been tossed out of the field back along the fence row. That one is an exceptional site with a long term prehistoric occupation of course, but pretty much every site we examine down there that's in a plowed field had an artifact or two that had been tossed over the fence line.