Different Kinda Rock, We found on the Muleshoe ranch,Brewster Co. Tx. at about 3,500ft elevation,is an old seabed that has critter's showing-up as the rain washes away the sand and limestone covering them. Some look to be ancient fish. One is just rib's sticking-out so far. Have been told this area was a seabed about 65 million yr. ago. It is High desert now. Great Muledeer and Elk Habitat .Here is a pic. of a couple find's on the seabed level, that the Mrs. picked-up,,,,,,,,,Dusty