Eocene Green River Crocodile Coprolite VF-GR-17-047Borealosuchus wilsoni (?) Coprolite with Diplomystus Green River Formation Middle Eocene Lincoln County, Wyoming This specimen of coprolite from the Green River Formation is an exceptionally large example. Most coprolite seen in the formation represents various genera of fishes. On rare occasion a large coprolite can be found that most probably represents crocodiles which are the largest swimming resident of the middle Eocene lakes. Borealosuchus