Lower Eocene Footprints from Northwest Washington, USA. Part 1: Reptile Tracks
Lower Eocene fluvial The Border South strata in the Chuckanut Formation preserve abundant bird and mammal tracks.Reptile trace fossils include footprints from a small turtle (ichnogenus Chelonipus), and several Crocodylian trackways that consist of irregularly spaced footprints associated with linear tail drag marks.The latter trackways represent &