Red Gulch Dinosaur Tracksite

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Observation platform at Red Gulch Dinosaur Tracksite
Dinosaur footprint at the tracksite.

Red Gulch Dinosaur Tracksite is an assemblage of fossil dinosaur footprints on public land near Shell, in Big Horn County, Wyoming.[1]

They were discovered in 1997 by Erik P. Kvale, a research geologist from the Indiana Geological Survey.[2]

The site is managed by the Bureau of Land Management as part of the Red Gulch/Alkali National Back Country Byway and is open to the public.[1]

Fossils[edit]

The fossilized tracks are believed to have been made during the Middle Jurassic Period, 160-180 million years b.p., on what was then a shore of the Sundance Sea.[3] Theropod tracks are thought to be among those discovered, but evidence suggests that the tracks were made by a large, diverse group of dinosaurs.[4][5]

Walkway at the dinosaur tracksite overlook

Geology[edit]

The tracksite is in a limestone layer in the lower part of the Sundance Formation. Its discovery was somewhat surprising, since the Sundance was historically considered to be marine in nature. Indeed, the layer just above the tracksite contains abundant marine fossils including numerous Gryphaea nebrascensis, indicating that later in the Jurassic it was once again submerged.[4]

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Coordinates: 44°29′10″N 107°47′15″W / 44.48620°N 107.78748°W / 44.48620; -107.78748

Jurassic Period
Lower/Early Jurassic Middle Jurassic Upper/Late Jurassic
Hettangian | Sinemurian
Pliensbachian | Toarcian
Aalenian | Bajocian
Bathonian | Callovian
Oxfordian | Kimmeridgian
Tithonian