I know the odds are well against it being a fossil of a bone, but that is the first thing that hit me when I saw it. If anyone can help tell me what this is (assuming it is some thing other than a rock) I would appreciate it.
Hey Turtle, Great find! I'm not an expert on fossils ,but I have collected rocks like this myself. I am sending pictures of similar finds. In the dessert portions of Texas calcium carbonate forms around roots of both yucca plants and mesquite trees and bushes.When this happens the process forms rocks much like your finds. This could be a possible explanation of the origin of your finds. Just my two cents worth! Hope it Helps! The Kid