My wife came into my office the other day and said "here is a crab you wanted me to put in a safe place" Wow!!! I was flabbergasted! This was 12 years ago. This is a very rare double crab in a concretion. These are Orbitoplax weaveri found in Oregon in the Looking Glass Formation and Eocene in age. Really really tuff to get a double crab!
RB