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Lower Eocene Footprints from Northwest Washington, USA. Part 1: Reptile Tracks

Geology Department, Western Washington University, Bellingham, WA 98225, USA
Geosciences 2019, 9(7), 321; https://doi.org/10.3390/geosciences9070321
Received: 23 June 2019 / Revised: 18 July 2019 / Accepted: 19 July 2019 / Published: 22 July 2019
Lower Eocene fluvial 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 “punting” locomotion, where a submerged Crocodylian used intermittent substrate contacts to provide forward motion of their neutrally buoyant bodies. Two adjacent sandstone blocks preserve Crocodylian trace fossils that are named herein as a new ichnogenus and ichnospecies Anticusuchipes amnis. Two other Crocodylian trackways lack sufficient detail for ichnotaxonomic assignment. View Full-Text
Keywords: Chuckanut Formation; Crocodylian; footprints; ichnology; trace fossils; tracks; turtle; Washington Chuckanut Formation; Crocodylian; footprints; ichnology; trace fossils; tracks; turtle; Washington
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Mustoe, G.E. Lower Eocene Footprints from Northwest Washington, USA. Part 1: Reptile Tracks. Geosciences 2019, 9, 321.

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