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Unkpapa Sandstone Member (SD): occurs primarily in western South Dakota as a well-sorted, fine-grained sandstone, consisting primarily of quartz, with some feldspar inclusions. [21] Locally overlain by the Lakota Formation or the main body of the Morrison, and overlies the Redwater Shale Member of the Sundance Formation. [22]
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.
The Morrison cf. Leptolepis probably had a live mass of about 37g. [12] It is the only teleost fish known from the formation and was morphologically more highly derived than other Morrison fish. [12] It is believed to have fed on contemporary fish and small invertebrates. [12] Morrolepis [10] M. schaefferi [13] Colorado
It is formed by the more erosion-resistant sandstones of the Dakota Formation protecting the softer, less erosion-resistant strata of the Morrison Formation. Hogsback up Bald Mountain, in the Adirondacks of New York. Dinosaur Ridge is a well known hogback that is part of Morrison Fossil Area National Natural Landmark within Morrison, Colorado.
The Sundance Formation is a western North American sequence of Middle Jurassic to Upper Jurassic age [1] Dating from the Bathonian to the Oxfordian, around 168-157 Ma, It is up to 100 metres thick [2] and consists of marine shale, sandy shale, sandstone, and limestone deposited in the Sundance Sea, an inland sea that covered large parts of western North America during the Middle and early Late ...
The Late Jurassic Morrison Formation is found in several U.S. states, including Colorado, Utah, Wyoming, Montana, New Mexico, Oklahoma, South Dakota, and Texas. It is notable as being the most fertile single source of dinosaur fossils in the world. The roster of dinosaurs from the Morrison is impressive.
: The new type section of the Tokay Tongue integrally establishes the temporal correlation of the terrestrial sequence tongues of the West Shore Dakota Sandstone classification with the X-bentonite reference horizon, biological horizons of the Colorado Group, and lithological sequence horizons of the Greenhorn Limestone and Graneros Shale.
Cretaceous Dakota Group sandstone and shale anticline The Dakota Hogback is a long hogback ridge at the eastern fringe of the Rocky Mountains that extends north-south from southern Wyoming through Colorado and into northern New Mexico in the United States .