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Type locality for the Morrison Formation above the town of Morrison, Colorado. 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.
The Morrison Formation is a distinctive sequence of Upper Jurassic sedimentary rock that is 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 grey, greenish gray, or red.
In 2009, a study by J. R. Foster was published which estimated the body masses of mammals from the Morrison Formation by using the ratio of dentary length to body mass of modern marsupials as a reference. Foster concludes that Docodon was the most massive mammaliaform genus of the formation at 141g and Fruitafossor was the least massive at 6g ...
The Morrison Formation is a sequence of shallow marine and alluvial sediments which, according to radiometric dating, ranges between 156.3 million years old at its base, [10] to 146.8 million years old at the top, [11] which places it in the late Oxfordian, Kimmeridgian, and early Tithonian stages of the Late Jurassic
Three geological formations, the Sundance, the Morrison, and the Cloverly Formations, containing fossil remains from the Late Jurassic of the Mesozoic Era are exposed. Nineteenth-century paleontologists discovered many well-preserved specimens of dinosaurs, as well as mammals, turtles, crocodilians, and fish from the Morrison Formation.
The tracks occur in limestone of the Jurassic Morrison Formation. The site formed along the shore of a large freshwater lake at the time the tracks were made. A previously unmapped region was discovered in 2012, where removal of alluvium revealed 90 new trackways, showing parallel prints. [2]
The Morrison Formation is a sequence of shallow marine and alluvial sediments which, according to radiometric dating, ranges between 156.3 million years old at its base, [12] to 146.8 million years old at the top, [13] which places it in the late Oxfordian, Kimmeridgian, and early Tithonian stages of the Late Jurassic
The Morrison Formation— a large Late Jurassic geologic formation in the Colorado Plateau region of the Western United States. Fossilized Late Jurassic North American animals of the Kimmeridgian and Tithonian ages are found in its paleontological sites, located primarily in western Colorado and eastern Utah.