Hi, Please see the attached pdf file. I found this large fossilized bone in a creek bed in California. Based on photos found online, it appears to be an astragalus. It has a distinct rectangular quartz inclusion that may have filled a preexisting cavity. I'm curious whether that is a distinctive trait that might allow it to be identified. Again, scanning the web, it may be a sloth or hippo, but I have no idea whether they corresponded in size.
Being new to fossilling, I'm not at all sure of its origins. I originally thought it was a dino bone and am open to all opinions! THANKS!
FossilFind2022.pdf