I was at Whiskey Bridge near College Station, Texas digging along the lower bank of the Brazos River. I had dug about a foot down and found this small round rock. When I got it home I used my jewler's loop to look at it more closely. I found tiny indentions that looks like tiny creatures. Can someone identify what these are? Also the black one is rough and smells like metal but didn't pass the metal test. This was in the same hole.
Thanks
Joy