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Spearfish Canyon
Spearfish Canyon is a deep but narrow gorge carved by Spearfish Creek located in Lawrence County, South Dakota, U.S., just south of Spearfish. The canyon is located within the Black Hills, located on the northern edge of the Black Hills National Forest. The Spearfish Canyon Scenic Byway travels through the Canyon from Spearfish to Cheyenne Crossing along U.S. Route 14A. The highway follows an old railroad grade that was abandoned after massive flooding in 1933. Natural history Approximately 600 million years ago in the Precambrian, the area was covered by a sea. As waters subsided and land masses began to appear 60 to 30 million years ago (between the Paleocene and Oligocene epochs), drainages such as Spearfish Canyon formed as softer rock was eroded away. Today, a National Scenic Byway, U.S. Highway 14A, winds through the canyon. This area is truly a crossroads, and trees and plants from Rocky Mountains, eastern woodlands, northern forests, and the Great Plains areas can ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spearfish Canyon Falls Black Hills NF Oct 2018
Spearfish may refer to: Places *Spearfish, South Dakota, United States * North Spearfish, South Dakota, United States * Spearfish Formation, a geologic formation in the United States Biology * ''Tetrapturus'', a genus of marlin containing spearfish, fish with elongated bodies and a spear-like snouts or bills ** Longbill spearfish, a species of marlin native to the Atlantic Ocean ** Mediterranean spearfish, a species of marlin native to the Mediterranean Sea ** Shortbill spearfish, a species of marlin native to the Indian and Pacific Oceans **Roundscale spearfish, a species of marlin native to the eastern Atlantic Ocean to the western Mediterranean Sea *Spearfish remora, a species of remora found around the world in tropical and subtropical seas * Spearfish Fisheries Center, one of 70 fish hatcheries as part of the National Fish Hatchery System of the U.S. Fish and Wildlife Service Military *Spearfish torpedo, or simply Spearfish, is a modern torpedo built by GEC-Marconi *Fai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Scenic Byway
A National Scenic Byway is a road recognized by the United States Department of Transportation for one or more of six "intrinsic qualities": archeological, cultural, historic, natural, recreational, and scenic. The program was established by Congress in 1991 to preserve and protect the nation's scenic but often less-traveled roads and promote tourism and economic development. The National Scenic Byways Program (NSBP) is administered by the Federal Highway Administration (FHWA). The most scenic byways are designated All-American Roads, which must meet two out of the six intrinsic qualities. The designation means they have features that do not exist elsewhere in the United States and are unique and important enough to be tourist destinations unto themselves. As of January 21, 2021, there are 184 National Scenic Byways located in 48 states (all except Hawaii and Texas). History The NSBP was established under the Intermodal Surface Transportation Efficiency Act of 1991, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peter Norbeck Scenic Byway
The Peter Norbeck Scenic Byway is a National Scenic Byway in the Black Hills National Forest in the southwestern part of the U.S. state of South Dakota. It is a loop which is composed of portions of U.S. Route 16A (US 16A), South Dakota Highway 244 (SD 244), SD 87, and SD 89. Parts of the byway enter Black Hills National Forest, Custer State Park, and the Mount Rushmore National Memorial; the byway also travels within of the Crazy Horse Memorial. The byway is named after Peter Norbeck, who served as governor of and senator for South Dakota. Route description The Peter Norbeck Scenic Byway consists of a loop made up of four numbered highways. The byway is part of US 16A, the Iron Mountain Road, south of Keystone. This portion of the highway includes several tunnels and pigtail bridges. The byway enters Custer State Park along its eastern edge and turns west at its intersection with SD 36. In the western part of the state park, the byway splits into two hig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black Hills Gold Rush
The Black Hills Gold Rush took place in Dakota Territory in the United States. It began in 1874 following the Custer Expedition and reached a peak in 1876–77. Rumors and poorly documented reports of gold in the Black Hills go back to the early 19th century. In the 1860s, Roman Catholic missionary Father De Smet is reported to have seen Sioux Indians carrying gold which they told him came from the Black Hills. Prior to the Gold Rush, the Black Hills were used by Native Americans (primarily bands of Sioux but others also ranged through the area). The United States government recognized the Black Hills as belonging to the Sioux by the Treaty of Laramie in 1868. Despite being within Native American territory, and therefore off-limits, white Americans were increasingly interested in the gold-mining possibilities of the Black Hills. Prospectors found gold in 1874 near present-day Custer, South Dakota, but the deposit turned out to be small. The large placer gold deposits of D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Homestake Mine (South Dakota)
The Homestake Mine was a deep underground gold mine (8,000 feet or 2,438 m) located in Lead, South Dakota. Until it closed in 2002 it was the largest and deepest gold mine in North America. The mine produced more than of gold during its lifetime. This is about or a volume of gold roughly equal to 18,677 US gallons. The Homestake Mine is famous in scientific circles because of the work of a deep underground laboratory that was established there in the mid-1960s. This was the site where the solar neutrino problem was first discovered, in what is known as the Homestake Experiment. Raymond Davis Jr. conducted this experiment in the mid-1960s, which was the first to observe solar neutrinos. On July 10, 2007, the mine was selected by the National Science Foundation as the location for the Deep Underground Science and Engineering Laboratory (DUSEL). It won over several candidates, including the Henderson Mine near Empire, Colorado. History The Homestake deposit was discovered by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roughlock Falls Nature Area
Roughlock Falls Nature Area is a nature area in Lawrence County, South Dakota in the United States. It is located in Spearfish Canyon, near Little Spearfish Creek, just before the creek joins Spearfish Creek, within the Black Hills National Forest. The area is managed by the South Dakota Department of Game, Fish, and Parks. Birdwatching, fishing, hiking, and snowmobiling are popular activities within this area. The area is about southwest of Spearfish or about west of Lead, just west of Spearfish Canyon Scenic Byway (U.S. 14A). Wildlife found in the area include: Elk, Bald eagle, White-tailed deer, Mule deer, Coyote, Beaver, Bighorn sheep, Mountain goat, and Mountain lion. See also *Spearfish Canyon *Black Hills *Black Hills Gold Rush The Black Hills Gold Rush took place in Dakota Territory in the United States. It began in 1874 following the Custer Expedition and reached a peak in 1876–77. Rumors and poorly documented reports of gold in the Black Hills go back to the e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paha Sapa Limestone
The Pahasapa Formation is a geological unit of primarily limestone and dolomite that is exposed in the Black Hills of South Dakota and northeastern Wyoming, and underlies parts of Nebraska, in the United States. Also referred to as the Pahasapa Limestone (especially in older publications and outside South Dakota), this unit is analogous to the Madison Limestone, the Lodgepole Limestone, and the Burlington Limestone, other Mississippian-aged limestones and dolomites in the midwestern United States. Some recent literature has grouped stretches of the Pahasapa into the Madison Group. The formation is of local importance, as it contains the Madison aquifer, and two of the ten longest caves in the world. Lithology The Pahasapa consists mainly of grey massive limestone and dolomite. The limestone has been classified as primary dolo-sparitic, with some micrite, using the Folk classification, and as skeletal wackestone using the Dunham classification. The central Black Hills Pahasapa is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleogene
The Paleogene ( ; British English, also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period, geologic period and system that spans 43 million years from the end of the Cretaceous Period million years ago (annum, Mya) to the beginning of the Neogene Period Mya. It is the beginning of the Cenozoic Era of the present Phanerozoic Eon. The earlier term Tertiary Period was used to define the span of time now covered by the Paleogene Period and subsequent Neogene Period; despite no longer being recognised as a formal stratigraphy, stratigraphic term, 'Tertiary' is still widely found in earth science literature and remains in informal use. Paleogene is often abbreviated "Pg" (but the United States Geological Survey uses the abbreviation PE for the Paleogene on the Survey's geologic maps). During the Paleogene, evolution of mammals, mammals diversified from relatively small, simple forms into a large group of diverse animals in the wake of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Englewood Limestone
Englewood is a corruption of Dutch Engelse woud (English woods or fores) & ''Engelse buurt'', or "English Neighborhood", which originally referred to Englewood, New Jersey's status as one of the few English-speaking settlements in Dutch-speaking New Netherland. Today, the name may refer to: Places ; Canada * Englewood, British Columbia ; United States * Englewood, California * Englewood, Colorado ** Englewood (RTD), transit station in Englewood, Colorado ** Federal Correctional Institution, Englewood * Englewood, Florida * Englewood (Columbus, Georgia), a neighborhood * Englewood, Chicago, Illinois ** West Englewood, Chicago, Illinois * Englewood, Kansas * Englewood, Missouri * Englewood, New Jersey * Englewood Cliffs, New Jersey * Englewood, Ohio * Englewood, South Dakota * Englewood, Tennessee * Englewood, Wisconsin Other * the Englewood Railway Englewood Railway was a logging railroad on northern Vancouver Island, Canada. Headquartered in Woss, British Columbia, the li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unconformity
An unconformity is a buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous. In general, the older layer was exposed to erosion for an interval of time before deposition of the younger layer, but the term is used to describe any break in the sedimentary geologic record. The significance of angular unconformity (see below) was shown by James Hutton, who found examples of Hutton's Unconformity at Jedburgh in 1787 and at Siccar Point in 1788. The rocks above an unconformity are younger than the rocks beneath (unless the sequence has been overturned). An unconformity represents time during which no sediments were preserved in a region or were subsequently eroded before the next deposition. The local record for that time interval is missing and geologists must use other clues to discover that part of the geologic history of that area. The interval of geologic time not represented is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deadwood Formation
The Deadwood Formation is a geologic formation of the Williston Basin and Western Canada Sedimentary Basin. It is present in parts of North and South Dakota and Montana in the United States, and in parts of Alberta, Saskatchewan, and southwestern corner of Manitoba in Canada. It is of Late Cambrian to Early Ordovician age and was named for exposures in Whitewood Creek near Deadwood, South Dakota.Glass, D.J. (editor) 1997. Lexicon of Canadian Stratigraphy, vol. 4, Western Canada including eastern British Columbia, Alberta, Saskatchewan and southern Manitoba. Canadian Society of Petroleum Geologists, Calgary, 1423 p. on CD-ROM. . It is a significant aquifer in some areas, and its conglomerates yielded significant quantities of gold in the Black Hills of South Dakota. It preserves trace fossils such as ''Skolithos'', and remains of Late Cambrian trilobites and brachiopods, as well as Ordovician fossils. A 20 MW geothermal power plant is under construction, drilling 3.5 kilometers d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordovician
The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. The Ordovician, named after the Celtic Britons, Welsh tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were placing the same Rock (geology), rock beds in North Wales in the Cambrian and Silurian systems, respectively. Lapworth recognized that the fossil fauna in the disputed Stratum, strata were different from those of either the Cambrian or the Silurian systems, and placed them in a system of their own. The Ordovician received international approval in 1960 (forty years after Lapworth's death), when it was adopted as an official period of the Paleozoic Era by the International Union of Geological Sciences, Intern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
