Here are two views of a stone found in a creek feeding into the North Sulphur River in Fannin County Texas. It is from a gravel bed where several Folsom and Clovis points have been deposited in the past from an unknown source upstream.A number of these have been found but this is the only one I have personally found. In addition,we found extinct camel teeth nearby;they are fairly common along with extinct horse teeth and mastodon enamel. This stone is quartzite and the parallel lines do not appear on the obverse side as would be the case with natural fractures. One edge seems to have been intentionally ground flat as opposed to the irregularity of the other edges.