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Dakota Formation
The Dakota is a sedimentary geologic unit name of formation and group rank in Midwestern North America. The Dakota units are generally composed of sandstones, mudstones, clays, and shales deposited in the Mid-Cretaceous opening of the Western Interior Seaway.Monroe, James S. and Wicander, Reed (1997) ''The Changing Earth: Exploring Geology and Evolution'' (2nd edition) Wadsworth Publishing Company, Belmont, California, page 610, The usage of the name Dakota for this particular Albian-Cenomanian strata is exceptionally widespread; from British Columbia and Alberta to Montana and Wisconsin to Colorado and Kansas to Utah and Arizona. It is famous for producing massive colorful rock formations in the Rocky Mountains and the Great Plains of the United States, and for preserving both dinosaur footprints and early deciduous tree leaves. Owing to extensive weathering of older rocks during the Jurassic and Triassic, the Dakota strata lie unconformably atop many different formations rangin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dinosaur Ridge
Dinosaur Ridge is a segment of the Dakota Hogback in the Morrison Fossil Area National Natural Landmark located in Jefferson County, Colorado, near the town of Morrison and just west of Denver. The Dinosaur Ridge area is one of the world's most famous dinosaur fossil localities. In 1877, fossil excavation began at Dinosaur Ridge under the direction of paleontologist Othniel Charles Marsh. Some of the best-known dinosaurs were found here, including ''Stegosaurus'', ''Apatosaurus'', ''Diplodocus'', and ''Allosaurus''. In 1973, the area was recognized for its uniqueness as well as its historical and scientific significance when it was designated the Morrison Fossil Area National Natural Landmark by the National Park Service. In 1989, the Friends of Dinosaur Ridge formed to address increasing concerns regarding the preservation of the site and to offer educational programs on the area's resources. The rocks on the west side of Dinosaur Ridge are part of the widespread Morrison Form ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Platte Formation
The South Platte Formation is a Mesozoic geologic formation found in the U.S. state of Colorado. Fossil ankylosaur tracks have been reported from the formation.Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607. See also * List of dinosaur-bearing rock formations ** List of stratigraphic units with ornithischian tracks Indeterminate or unspecified ornithischian tracks Ceratopsians Ornithopods Thyreophorans Ankylosaurs Stegosaurs See also List of dinosaur-bearing rock formations This list of dinosaur-bearing rock formations is a list of geologic f ... *** Ankylosaur tracks Footnotes References * Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. . Cretaceous System of North America Cretaceous Colorado {{US-geologic-formation-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cimarron River (Arkansas River Tributary)
The Cimarron River ( ; iow, Ñíxgu, script=Latn or , meaning 'Salt River'; chy, Hotóao'hé'e) extends across New Mexico, Oklahoma, Colorado, and Kansas. The headwaters flow from Johnson Mesa west of Folsom in northeastern New Mexico. Much of the river's length lies in Oklahoma, where it either borders or passes through eleven counties. There are no major cities along its route. The river enters the Oklahoma Panhandle near Kenton, Oklahoma, crosses the southeastern corner of Colorado into Kansas, reenters the Oklahoma Panhandle, reenters Kansas, and finally returns to Oklahoma where it joins the Arkansas River at Keystone Reservoir west of Tulsa, Oklahoma, its only impoundment. The Cimarron drains a basin that encompasses about .Larry O'Dell, " ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cedar Mountain Formation
The Cedar Mountain Formation is the name given to a distinctive sedimentary geologic formation in eastern Utah, spanning most of the early and mid-Cretaceous. The formation was named for Cedar Mountain (Utah), Cedar Mountain in northern Emery County, Utah, where William Lee Stokes first studied the exposures in 1944. Geology The formation occurs between the underlying Morrison Formation and overlying Naturita Formation (sometimes formerly called the Dakota Formation). It is composed of non-marine sediments, that is, sediments deposited in rivers, lakes and on flood plains. Based on various fossils and radiometric dating, radiometric dates, the Cedar Mountain Formation was deposited during the last half of the Early Cretaceous Epoch, about 127 - 98 million years ago (mya). It has lithography similar to the Burro Canyon Formation in the region. Dinosaur fossils occur throughout the formation, but their study has only occurred since the early 1990s. The dinosaurs in the lower part ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Naturita Formation
The Naturita Formation is a classification used in western Colorado and eastern Utah for a Cretaceous Period sedimentary geologic formation. This name was "applied to the upper or carbonaceous part of Dakota Formation, Dakota Group" by R.G. Young in 1960, naming it for Naturita, Colorado.Young, R.G., 1960, Dakota Group of Colorado Plateau: Bulletin of the American Association of Petroleum Geologists, v. 44, no. 2, p. 156-194. The name is not used by United States Geological Survey, U.S. Geological Survey authors, but has found growing acceptance by the Utah Geological Survey History of the name The formation in Utah and western Colorado overlies the Cedar Mountain Formation, Cedar Mountain and Burro Canyon Formation, Burro Canyon Formations, and underlies the Mancos Shale formation, thus occupying a similar position of sedimentary strata that have widely been called Dakota Formation in Iowa, Kansas and Nebraska. Witzke, B.J., and Ludvigson, G.A., 1994, The Dakota Formation in Io ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inyan Kara Group
The Inyan Kara Group is a geologic group classification applied in South Dakota and adopted in portions of Wyoming and Montana. It preserves fossils of the mid-Cretaceous period. Of late Albian age, this classification correlates with the lower Dakota Formation (Nishnabotna member) known in the southwest corner of the State. The South Dakota Geological Survey has also extended the Graneros to group other formations into a unit that correlates with the upper Dakota Formation ''(Note: This definition is widely different than the generally consistent definitions of Graneros/Belle Fourche.'''')''. These state definitions of the Inyan Kara and Graneros Groups thereby cover the first two sequences of the Western Interior Seaway recorded by the Dakota Formation. North Dakota also classifies the same strata as Inyan Kara, but only of formation rank without recognizing further formal subdivision, and assigns this Inyan Kara Formation as the lowest member of the Dakota Group. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Newcastle Formation
The Newcastle Formation is a geologic formation in British Columbia. It preserves fossils dating back to the Cretaceous period. See also * List of fossiliferous stratigraphic units in British Columbia This is a list of fossiliferous stratigraphic units in British Columbia, Canada. References * {{Lists of fossiliferous stratigraphic units in Canada British Columbia British Columbia (commonly abbreviated as BC) is the westernmost prov ... References * Cretaceous British Columbia {{British Columbia-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Newcastle Sandstone
The Newcastle Sandstone is a geologic formation in Wyoming, United States. It preserves fossils dating back to the Late Cretaceous period. Named as a member of Draneros shale of Colorado group for the town of Newcastle, Weston Co, WY in Powder River basin, where member is conspicuously developed. Consists of reddish to light-yellow sandstone associated with black, carbonaceous shale. About 35 ft thick in vicinity of Newcastle. A Cretaceous sequence can be formed in the northern Great Plains in Williston and Powder River basins, as well as Chadron arch. This area is classed as a formation on the westrin rim of the black hills. See also * List of fossiliferous stratigraphic units in Wyoming * Paleontology in Wyoming Paleontology in Wyoming includes research into the prehistoric life of the U.S. state of Wyoming as well as investigations conducted by Wyomingite researchers and institutions into ancient life occurring elsewhere. The fossil record of the US sta ... Referen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mowry Shale
The Mowry Shale is an Early Cretaceous geologic formation. The formation was named for Mowrie Creek, northwest of Buffalo in Johnson County, Wyoming. Description The Mowry Shale or Fish-scale Beds because of the abundance of fish scales, is a dark-gray, siliceous shale that weathers silver gray; it is 10-70 m thick. 40Ar/39Ar of sanidine from a bentonite yielded an age of 97.17 +/-0.69 Ma, thus is Cenomanian in age. Fossils indicate the Mowry was deposited during the early stages of the Western Interior Seaway. Age In so much as the Mowry was observed to lie above formations that were originally thought to be associated with the difficult to date upper Dakota units, especially Newcastle Sandstone, the Mowry was previously thought to be of Cenomanian age. However, recent studies, particularly of fossil pollens and spores, have dated the Mowry to the late-Albian. In many locations, the Mowry is bounded above by the Clay Spur bentonite, which is assigned the radiometric dat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Williston Basin
The Williston Basin is a large intracratonic sedimentary basin in eastern Montana, western North Dakota, South Dakota, southern Saskatchewan, and south-western Manitoba that is known for its rich deposits of petroleum and potash. The basin is a geologic structural basin but not a topographic depression; it is transected by the Missouri River. The oval-shaped depression extends approximately north-south and east-west. The Williston Basin lies above an ancient Precambrian geologic basement feature, the Trans-Hudson Orogenic Belt that developed in this area about 1.8-1.9 billion years ago, and that created a weak zone that later led to sagging to produce the basin. The Precambrian basement rocks in the center of the basin beneath the city of Williston, North Dakota lie about below the surface. Deposition of sediments began in the Williston area during Cambrian time, but subsidence and basin filling were most intense during the Ordovician, Silurian, and Devonian Periods, when ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plainview Sandstone , a Paleo-Indian projectile point
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Plainview or Plain View may refer to: *Plainview, Arkansas *Plainview, California *Plainview, Georgia * Plainview, Illinois *Plainview, Louisville, Kentucky *Plainview, Minnesota *Plainview, Nebraska *Plainview, New York *Plain View, North Carolina *Plainview, South Dakota *Plainview, Tennessee *Plainview, Texas *Plainview, Wharton County, Texas *Plain View, King and Queen County, Virginia *Plain View, Powhatan County, Virginia *Plainview Township (other) See also *Plain view doctrine *Plainview point In the classification of Archaeological cultures of North America, the term Plainview points refer to Paleoindian projectile points dated between 10,000 and 9,000 Before Present. The point was named in 1947 after the discovery of a large cache of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skull Creek Shale
The Skull Creek Shale is a Cretaceous geologic formation in Wyoming as well as Colorado and Nebraska, United States. The Skull Creek Shale corresponds with the Kiowa Shale. See also * List of fossiliferous stratigraphic units in Colorado * List of fossiliferous stratigraphic units in Nebraska * List of fossiliferous stratigraphic units in Wyoming * Paleontology in Colorado * Paleontology in Nebraska * Paleontology in Wyoming Paleontology in Wyoming includes research into the prehistoric life of the U.S. state of Wyoming as well as investigations conducted by Wyomingite researchers and institutions into ancient life occurring elsewhere. The fossil record of the US sta ... References Cretaceous Colorado Cretaceous geology of Nebraska Cretaceous geology of Wyoming {{Cretaceous-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
