Went fishing with a friend and his son to Kemmerer, Wyoming 2 weeks ago. The bites were hard to feel, but the evidence that they were there is indisputeable.
Very nice specimens! I did a little rock hunting for fossils of the same type in Wyoming back in 1983. Can't remember the formation name, but the age is Cretaceous, some 70 million years. We spent an entire day and didnt find any that nice.