Can someone tell me what this might be? I found it on top of a ridge about 50 feet from the Pedernales River. I live 4 miles outside of Johnson City, Texas on a small ranch. At first I thought it was a boot print of some sort, but it looks too oval-shaped and symmetrical to be a boot print. It weighs about 5 lbs. It's not concrete. We live on a small ranch and it was in a pasture nowhere near where any manmade concrete would be. I have looked in the area where I found this piece and found a small broken piece of what looks like it may have the same markings as this.
Any ideas would be helpful.