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The Morrison Formation is subdivided into several members, the occurrence of which are varied across the geographic extent of the Morrison. Members are (in alphabetical order): [ 7 ] [ 8 ] Bluff Sandstone Member (AZ, CO, NM, UT): Well-sorted, light brown to white sandstone with large grains and components of chert.
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 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.
Sequence from orange cliff in foreground to cliff top in background Entrada Formation, Curtis Formation, Summerville Formation, capped by the (pink) Tidwell Member of the Morrison Formation. The San Rafael Group is a geologic group or collection of related rock formations that is spread across the U.S. states of New Mexico , Arizona , Utah and ...
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
Maraapunisaurus is a genus of sauropod dinosaur from the Late Jurassic Morrison Formation of western North America. Originally named Amphicoelias fragillimus , it has sometimes been estimated to be the largest dinosaur specimen ever discovered.
The Late Jurassic dinosaurs from the Morrison Formation, on the Colorado Plateau in the Western U.S. Pages in category "Dinosaurs of the Morrison Formation" The following 52 pages are in this category, out of 52 total.
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.