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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.
Although the paleoclimate of the Morrison formation was semiarid with only seasonal rainfall, there were enough bodies of water to support a diverse ichthyofauna. [7] Although abundant, fish remains are constrained to only certain locations within the formation. [ 7 ]
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 ...
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, [104] and 146.8 million years old at the top, [105] which places it in the late Oxfordian, Kimmeridgian, and early Tithonian ages of the Late Jurassic epoch.
Locations in the Morrison Formation (yellow) where Allosaurus remains have been found. Allosaurus was the most common large theropod in the vast tract of Western American fossil-bearing rock known as the Morrison Formation, accounting for 70 to 75% of theropod specimens, [106] and as such was at the top trophic level of the Morrison food chain ...
The Morrison Formation records an environment and time dominated by gigantic sauropod dinosaurs such as Camarasaurus, Diplodocus, Apatosaurus and Brachiosaurus. Dinosaurs that lived alongside Barosaurus included the herbivorous ornithischians Camptosaurus , Dryosaurus , Stegosaurus and Othnielosaurus .
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 ...