brushy basin member of the morrison formation

Jensen and Ostrom (1977) described the locality as in Sec. This stratigraphic interval consists of as many as four lithofacies deposited in fluvial and playa-lake environments. Embed figure. 23, T50N, R14W, Montrose County, Colorado. The paleomagnetism of the ∼147 Ma (Tithonian) Brushy Basin Member of the Morrison Formation was analyzed to obtain a Late Jurassic paleomagnetic pole for North America. All the deposits discovered in the Brushy Basin Member are near surface and characterised by . Colorful, rounded slopes are typical of the Brushy Basin Member of the Jurassic-age Morrison Formation. The Morrison Formation is a distinctive sequence of Late Jurassic sedimentary rock that is found in the western United States, which has been the most fertile source of dinosaur fossils in North America. The quarry is developed in the upper part of the Brushy Basin Member of the Morrison Formation, approximately 26 m below its contact with the overlying Jackpile Member. At the time, the Morrison basin was characterized by shallow marine and tidal flat deposition along the southern shore of the Sundance Sea. In one 110-m-thick section in eastern Utah, 35 separate beds were deposited in a 2.2 m.y. Preserved elements range from scattered bones to articulated . These members are widespread in southwestern Colorado and southeastern Utah, and they are readily distinguished from one another throughout the Black Canyon area, except where exposures are poor. From Wikimedia Commons, the free media repository. Sample from a slightly altered sandstone in Disappointment Valley, Dawson Draw quadrangle, San Miguel County, Colorado, yielded a Pb-alpha age 585 +/-65 Ma (zircon), indicating age of source rock [Precambrian Z]. (2001) used a different lithostratigraphic nomenclature than we advocate for the interval between the Entrada Sandstone and Brushy At Montezuma Creek in southeast Utah, 184 samples were . Paleontology and Geology of the Upper Jurassic Morrison Formation Volume 36 of Bulletin (New Mexico . The occurrence of Hermanophyton species is well documented in the Salt Wash Member of the Morrison Formation near Hanson Creek Canyon in the Henry Mountains of Utah and in the Brushy Basin Member of the Morrison Formation near Cortez, Colorado. Anderson, Orin J., and Lucas, Spencer G., 1997, Lake T'oo'dichi' and the Brushy Basin of the Morrison Formation. Rheinische Friedrich-Wilhelms-Universität Bonn | Steinmann Institute ... Figure 7. The original extent of the Brushy Basin to the south ana west is not known, for it has been removed by pre-Dakota erosion from most of northeastern Arizona. Clayey bentonite beds in the Morrison often have a distinctive "popcorn" weathering texture resulting from expansion of the clay minerals when they get wet. 2004). Three primary clastic lithofacies are present in both the Brushy Basin Member and at Gale Crater: silt . A Basin Analysis Case Study: The Morrison Formation, Grants Uranium ...

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