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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.
This was the smallest known sauropod species of the Morrison Formation. [27] Around 1920 major fossil finds occurred in Oligocene deposits Colorado shares with South Dakota. Dozens of articulated skeletons and skulls were uncovered. Among them were animals resembling giant peccaries and rhinoceroses, as well as entelodonts and brontotheriids.
The Mother's Day Quarry (MDQ) is a Late Jurassic (Kimmeridgian) fossil site in the Morrison Formation that is located at the base of the Pryor Mountains in Carbon County, Montana. The site was first discovered by the Museum of the Rockies in 1994 and has produced over 2,500 elements since its discovery.
The fauna of Morrison Formation is similar to one in the coeval rocks of Tendaguru Beds (in Tanzania) and Lourinhã Formation in Portugal, [1] mostly with the second. Some genera are shared in Morrison and Lourinhã, such as Torvosaurus, [2] Ceratosaurus, [3] Stegosaurus, Dryosaurus, [4] and Allosaurus. [5] In sum, Morrison Fm has 37 valid ...
While relatively few pterosaur genera are named from the Morrison Formation, fragmentary material that is not referrable to the genus level suggests the presence of dsungaripteroids, ctenochasmatids, dimorphodontids, and more tentatively wukongopterids and pteranodontians.
The Morrison Formation is interpreted as a semiarid environment with distinct wet and dry seasons, and flat floodplains. Vegetation varied from river-lining forests of conifers, tree ferns, and ferns (gallery forests), to fern savannas with occasional trees such as the Araucaria -like conifer Brachyphyllum .
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 Morrison Formation records an environment and time dominated by gigantic sauropod dinosaurs. [63] Other dinosaurs known from the Morrison include the theropods Koparion , Stokesosaurus , Ornitholestes , Allosaurus , and Torvosaurus , the sauropods Apatosaurus , Brachiosaurus , Camarasaurus , and Diplodocus , and the ornithischians ...