Red Gulch Dinosaur Tracksite, Fossil park in Big Horn County, US

Red Gulch Dinosaur Tracksite is a fossil park in Big Horn County, Wyoming, with hundreds of preserved dinosaur footprints embedded in a limestone surface. The impressions span a large area and show the movement patterns of animals from the Middle Jurassic period.

Erik P. Kvale, a research geologist with the Indiana Geological Survey, found the tracks in 1997 on public land near Shell. The footprints lie in a limestone layer of the lower Sundance Formation, which was long thought to be entirely marine, so the find was unexpected. The layer just above holds abundant Gryphaea nebrascensis, showing the shore was later submerged again.

The tracks lie in a limestone layer of the lower Sundance Formation, a unit long considered marine. Above the tracksite, abundant Gryphaea nebrascensis oysters show the area was submerged again later in the Jurassic. The site is part of the Red Gulch/Alkali National Back Country Byway.

The tracksite lies along the Red Gulch/Alkali National Back Country Byway and is open to the public on land managed by the Bureau of Land Management. The main footprints are concentrated in an area called "the ballroom". Ground is exposed limestone, so bring sun protection and water; stay on marked routes to avoid walking on the fossils.

Many of the footprints run in a similar southwest direction, suggesting that dinosaurs may have traveled together toward ancient water sources. These movement patterns reveal something about how herds behaved in their search for water.