My newest find is this nice 2'x18" slab of bird tracks I found on a private ranch East of Roundup, MT. As you can see there are lots of tracks and partials. The only gripe I have is getting it to the truck. A guy could get a hernia! Good luck takes work so keep looking!
My wife and I went up to Fort Peck to do a little fishing, and while up there we found a couple ammonites. They were the mud nodule type, not the type found south of highway 200.