Dinosaur National Monument

The Gates of Lodore is the scenic entrance to the Canyon of Lodore, a canyon on the Green River in northwestern Colorado, United States. The name Gates of Lodore has become synonymous with the canyon itself and the two names are used interchangeably. The Canyon commences as the Green River departs Browns Park and cuts through the Uinta Mountains meandering eighteen miles until its end at Echo Park (Colorado), the confluence of the Green and Yampa River. It was named by the Powell Expedition after the English poem Cataract of Lodore. It is located in Dinosaur National Monument.

The Josie Bassett Morris Ranch Complex comprises a small complex of buildings in what is now Dinosaur National Monument in northeastern Uintah County, Utah, United States. The complex is listed as a historic district on the National Register of Historic Places. It is where Josie Bassett Morris, a small-time rancher and occasional accused stock thief, lived until 1963. The ranch, located in Browns Park, Colorado, was established by the Bassett family in the 1870s. Josie grew up there, and through her family came to know a number of outlaws, including Butch Cassidy, who frequented the area. Morris established her own homestead on Cub Creek in Utah in 1914 with help from friends Fred McKnight and the Chew family.

The Morrison Formation is a distinctive sequence of Upper Jurassic sedimentary rock found in the western United States which has been the most fertile source of dinosaur fossils in North America. It is composed of mudstone, sandstone, siltstone, and limestone and is light gray, greenish gray, or red. Most of the fossils occur in the green siltstone beds and lower sandstones, relics of the rivers and floodplains of the Jurassic period.

The Earl Douglass Workshop-Laboratory was used by Earl Douglass, the discoverer of the dinosaur bone deposits at the dinosaur quarry in Dinosaur National Monument, to preserve, study and prepare fossil specimens. Located next to the quarry adjacent to the Quarry Visitor Center, the workshop is a 10.5-foot (3.2 m) by 13.17-foot (4.01 m) stone shed with a flat soil roof, built into the hillside. It was built about 1920 by Carnegie Museum of Natural History personnel who were working at the site in eastern Utah.

The Denis Julien Inscription was left on a rock face in 1838 (1838) along the Green River in Moffat County, Colorado by Denis Julien, a French-American trapper who was one of the few Europeans in the area in the 1830s. Julien made a practice of leaving his mark on locations along the Green and Colorado rivers, leaving at least eight such marks. Four, including the Colorado mark, are listed on the National Register of Historic Places.

The Upper Wade and Curtis Cabin was built in 1933 by John Grounds in Dinosaur National Monument. The rustic building served as a guest lodge and ranger station, and is listed on the National Register of Historic Places as the oldest remaining guest accommodation in the park.

The Rial Chew Ranch Historic District comprises a ranching operation in what is now Dinosaur National Monument in northwestern Colorado, that existed from 1900 to 1949. The Rial Chew family established the ranch in 1900, operating it as a park inholding after the national monument was established in 1919. The district includes a house, a cabin, root cellar, corrals and several storage buildings. The cabin may have been built at Blue Mountain by Harry Chew, and moved to the present site by Jack Chew, Rial's father. The ranch was occupied by the Chew family until their special use permit expired in the early 1970s.

Echo Park Dam was proposed in the 1950s by the U.S. Bureau of Reclamation as a central feature of the Colorado River Storage Project. Situated on the Green River, a major tributary of the Colorado River, the dam was proposed for the Echo Park district of Dinosaur National Monument, flooding much of the Green and Yampa river valleys in the monument. The dam was bitterly opposed by preservationists, who saw the encroachment of a dam into an existing national park as another Hetch Hetchy, to be opposed as an appropriation of protected lands for development purposes. The Echo Park project was abandoned in favor of Glen Canyon Dam on the main stem of the Colorado, in lands that were not at that time protected. This was eventually regarded as a strategic mistake by conservation organizations.

Mantle's Cave is a cliff alcove in Dinosaur National Monument in Moffat County, Colorado. Located in the Castle Park region of the park, it is the largest rock shelter in the area. It was discovered before 1921 by local ranchers, Mr. and Mrs. Charles Mantle. Mrs. Mantle is reported to have done some excavation of the site, followed up by the Penrose-Taylor expedition of 1933 from Colorado College and the Fountain Valley School, which designated the site "Cave One." The site is a significant resource for the Fremont culture and is among the best resources in northwestern Colorado. Excavations in the 1930s and 1940s yielded significant material on the Fremont people and their relationship to the later Ancestral Puebloans.

The Sundance Formation is a western North American sequence of Middle Jurassic to Upper Jurassic age Dating from the Bathonian to the Oxfordian, around 168-157 Ma, It is up to 100 metres thick and consists of marine shale, sandy shale, sandstone, and limestone deposited in the Sundance Sea, an inland sea that covered large parts of western North America during the Middle and early Late Jurassic.