memorial

hello all. Hope you’re doing well!! I found this when I was a kid on the bank of a river in northern Idaho just around the bend from a dam in Post Falls. I was told by a local rock guy that it looks like a kind of memorial stone I always thought it looked like a fossil but I was a kid. LOL...

I found this coin while coin roll hunting. I wasn't sure if it was an error or something. The thing that interests me is how only half of one side is different. The reverse of the coin is completely different from the obverse! Thanks!