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Dakota Formation
The Dakota is a sedimentary rock, sedimentary geologic unit name of Formation (stratigraphy), formation and Group (stratigraphy), 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 Fossil track, dinosaur footprints and early deciduous tree leaves. Owing to extensive weathering of older rocks during the Jurassic and Tri ... [...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, Colorado, Morrison and just west of Denver. In 1877 Arthur Lakes, a clergyman, teacher, and amateur paleontologist from Golden, CO, and Henry Beckwith, a retired naval officer, discovered the first ever dinosaur material in the Morrison Formation at Dinosaur Ridge. The same year, excavation began under the direction of Yale paleontologist Dr. Othniel Charles Marsh. The first identified Stegosaurus fossils in the world were discovered here, and fossil bones found in the layers of rock here represent some well-known dinosaurs, including ''Apatosaurus'', ''Camarasaurus,'' ''Diplodocus'', and ''Allosaurus''. In 1973, the area was recognized as an outstanding example of the nation's natural heritage, and was designated a National Natural Landmark by the National Park Service. The area was expanded in June 2011, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Juan Basin
The San Juan Basin is a geologic structural basin located near the Four Corners region of the Southwestern United States. The basin covers 7,500 square miles and resides in northwestern New Mexico, southwestern Colorado, and parts of Utah and Arizona. Specifically, the basin occupies space in the San Juan, Rio Arriba, Sandoval, and McKinley counties in New Mexico, and La Plata and Archuleta counties in Colorado. The basin extends roughly N-S and E-W. The San Juan Basin is an asymmetric structural depression in the Colorado Plateau province, with varying elevation and nearly in topographic relief. Its most striking features include Chaco Canyon (northwestern New Mexico, between Farmington and Santa Fe) and Chacra Mesa. The basin lies west of the Continental Divide, and its main drainage is the southwest- to west-flowing San Juan River, which eventually joins the Colorado River in Utah. Climate of the basin is arid to semiarid, with an annual precipitation of and a ... [...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 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 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 and 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 Iowa and the type area, in Shurr, G.W., Ludvigson, G.A., and Hammond, R.H, editors, Perspectives ... [...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 North Dakota ( ) is a U.S. state in the Upper Midwest, named after the indigenous Dakota people, Dakota and Sioux peoples. It is bordered by the Canadian provinces of Saskatchewan and Manitoba to the ... [...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 The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ... period. See also * List of fossiliferous stratigraphic units in British Columbia References * Cretaceous British Columbia {{BritishColumbia-geo-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 The Great Plains is a broad expanse of plain, flatland in North America. The region stretches east of the Rocky Mountains, much of it covered in prairie, steppe, and grassland. They are the western part of the Interior Plains, which include th ... 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 Re ... [...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 d ... [...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, whe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plainview Sandstone
Plainview or Plain View may refer to: Places in the United States * 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 is a city in and the county seat of Hale County, Texas, Hale County, Texas, United States. The population was 20,187 at the 2020 United States census, 2020 census. History Plainview began when Z. T. Maxwell and Edwin Lowden Lowe establ ... * Plainview, Wharton County, Texas * Plain View, King and Queen County, Virginia * Plain View, Powhatan County, Virginia * Plainview Township (other) Other uses *, a hydrofoil See also * * Plain view doctrine * Plainview point, a Paleo-Indian projectile point {{disambiguation, geo ... [...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 Colorado refers to paleontological research occurring within or conducted by people from the United States, U.S. state of Colorado. The geologic column of Colorado spans about one third of Earth's history. Fossils can be found almo ... * Paleontology in Nebraska * Paleontology in Wyoming References Cretaceous Colorado Cretaceous geology of Nebraska Cretaceous geology of Wyoming Shale formations of the United States {{Cretaceous-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Muddy Formation
Muddy most commonly means covered in mud. Muddy may also refer to: Places Canada * Muddy Bay, Newfoundland and Labrador * Muddy Brook, Maberly, Newfoundland and Labrador United States * Muddy, Illinois, a village * Muddy, Montana, a census-designated place * Muddy Branch, Maryland, a tributary stream of the Potomac River * Muddy Brook (other) * Muddy Creek (other) * Muddy Fork (Oregon), a tributary of the Sandy River * Muddy Mountain, near Casper, Wyoming * Muddy Mountains, Nevada * Muddy Pass (other) * Muddy River (other) * Muddy Run (other) Nickname or stage name * Muddy Manninen (born 1957), Finnish guitarist * Muddy Ruel (1896–1963), American professional baseball player * Muddy Waters (1915–1983), American singer * Muddy Wilbury, (born 1950–2017) a stage name of Tom Petty while in the group the Traveling Wilburys Arts and entertainment * ''Muddy'' (film), 2021 Malayalam-language film * Muddy Mole, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Denver Basin
The Denver Basin, variously referred to as the Julesburg Basin, Denver-Julesburg Basin (after Julesburg, Colorado), or the D-J Basin, is a geology, geologic structural basin centered in eastern Colorado in the United States, but extending into southeast Wyoming, western Nebraska, and western Kansas. It underlies the Denver-Aurora Metropolitan Area on the eastern side of the Rocky Mountains. Geology The basin consists of a large asymmetric syncline of Paleozoic, Mesozoic, and Cenozoic sedimentary rock layers, trending north to south along the east side of the Front Range from the vicinity of Pueblo, Colorado, Pueblo northward into Wyoming. The basin is deepest near Denver, where it reaches a depth of approximately 13,000 ft (3900 m) below the surface. The basin is strongly asymmetric: the Dakota Sandstone outcrops in a Dakota Hogback, "hog-back" ridge near Morrison, Colorado, Morrison a few miles west of Denver, reaches its maximum depth beneath Denver, then ascends very gra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
