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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]
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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.
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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
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In the northwest, the Ludlow, Cannonball and Tongue River formations are categorized as the Fort Union Group, with thick sandstone layers sourced from the Rocky Mountains. Throughout the Eocene, the Black Hills eroded, shedding debris into the east, during a period with sub-tropical temperatures. Iron pyrite in shales oxidized, becoming bright ...
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