Our place is just north of Coleman. This one was found up on top the plateau but I have found another similar in the valley beneath that was formed like a hatchet head. This one was not as well formed so i was wondering if it was worked.
Yes, definitely 'worked'. Examine that one closely and keep it in your head. Any time you see obvious flake scars (in succession) it was done by human hands.
IF you find the right spot (not previously gone over) you can sometimes find quite a few artifacts. I found all of these (and dozens of broken pieces) in a single afternoon (digging) on my Aunt's property at the head waters of Bull Creek in Austin (late '70s).
Nothing too spectacular but a good 'mix' of points and small blades. Good return on an afternoons digging.