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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.
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 ...
Galton and Carpenter considered Alcovasaurus a member of the Stegosauridae, not more closely related to Kentrosaurus than to Stegosaurus. [1] However, a 2017 phylogeny of stegosaurids by Thomas Raven and Susannah Maidment found that Alcovasaurus lacked the fusion between the trochanters of the femur seen in adult eurypodans (stegosaurians and ankylosaurians), which means that it cannot be ...
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.
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.
Amphidon is an extinct genus of Late Jurassic mammal from the Morrison Formation. It is present in stratigraphic zone five. [ 2 ] Two species have been named in the genus: Amphidon superstes and Amphidon aequicrurius , by Simpson in 1925.
Dystrophaeus is an extinct genus of sauropod dinosaur.Its type and only species is Dystrophaeus viaemalae, named by Edward Drinker Cope in 1877. Its fossils were found in the Tidwell Member of the Morrison Formation of Utah.