Scientific Name: Chelichnus
These tracks were made during the Permian Period by a four-legged animal with five toes on each foot. Different types of fossil trackways are given scientific names of their own based on their morphology, since it is often impossible to know for sure which species made them. It was once thought that Chelichnus tracks were made by a tortoise, but that is now known to be incorrect because tortoises had not yet evolved when these tracks were made. The type of animal that made these tracks remains unknown. They may have been made by an early mammal ancestor known as a therapsid, or they could be the tracks of a reptile unrelated to mammals.
3D Chelichnus Tracks
Grand Canyon National Park, Arizona
Several sets of various size tracks from the ichnogenus Chelichnus in the Coconino Sandstone. Tracks are found along the Hermit trail in Grand Canyon National Park. http://www.nature.nps.gov/geology/paleontology/pub/fossil_conference_6/hunt.htm
This fossil found within Grand Canyon National Park, Arizona and is managed in situ. Learn about paleontology in the National Park Service: https://www.nps.gov/subjects/fossils/index.htm
Learn more about Grand Canyon National Park’s Centennial: https://www.nps.gov/grca/getinvolved/centennial.htm