when i was a kid we used to go mule deer hunting around marfa and the big bend country. as in walking up and down mountains hunting, not sitting ina tree house waiting for bambi to stroll by. one time in the 60s next to a dry stream bed i found a bunch of pottery shards and arrow heads etc in an area about 20 x 20 ft. my dad made me leave it all there. was fun to pick up and look at though. we used to go to hueco tanks in the 50s and 60s between el paso and carlsbad new mexico and sift the dirt for arrow heads etc. found a lot. days gone by.