Utahraptor quicksand death trap hypothesis illustrated by Julius Csotonyi. Fossils from this site could show Utahraptor to be social since the sandstone contains fossils from

Utahraptor Ridge: ridge; elevation 5,238 ft.; on State Institutional Trusts Lands of Utah, 4 mi. NE of Klondike Bluffs, 4.9 mi. NW of Mollie Hogans;

The fossil of Morrisonnepa jurassica along with a modern giant water bug, Lethocerus A New Morrison Site Preserves Ecosystem Details With Fossil Plants, Insects, and

Reconstruction of the Navajo Sandstone interdunal ecosystem by Russell Hawley An Early Sauropod-Like Dinosaur Skeleton from the Navajo Sandstone — Seitaad ruessi The holotype skeleton

Kayentatherium wellesi, likely similar to the Navajo Sandstone burrow-makers. Reconstruction © N. Tamura. Early Triassic Burrows and Mounds Likely Made by Tritylodonids — “Cousins” to

Illustration of Dystrophaeus bones in the Report U.S. Geog. Surveys West of the 100th Meridian –Volume 4, published in 1875 (David Rumsey Map Collection) The

Dinosaur Stomping Grounds track photo by Sandy Horvath-Dori, cc-by-2.0 Dinosaur Stomping Grounds The tracks at Dinosaur Stomping Grounds are preserved in late Jurassic aged Entrada

A short, easy hike for families Mill Canyon Dinosaur Tracksite The Mill Canyon Dinosaur Tracksite contains a diverse assemblage of fossilized tracks. More than 200