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Geology Of Nebraska
The geology of Nebraska is part of the broader geology of the Great Plains of the central United States. Nebraska's landscape is dominated by surface features, soil and aquifers in loosely compacted sediments, with areas of the state where thick layers of sedimentary rock outcrop. Nebraska's sediments and sedimentary rocks lie atop a basement of crystalline rock known only through drilling. Geologic history, bedrock geology and stratigraphy The land that is today Nebraska originated as a juvenile crust expansion of the continent Laurentia—today part of the North American Craton and the core of the North American continent—between 1.8 and 1.6 billion years ago (Ga). Tectonic models suggest that Laurentia was part of the supercontinent Columbia but returned to being an independent continent between 1.35 and 1.3 billion years ago after which it became joined first to Protorodinia and the supercontinent Rodinia by 1.07 Billion years ago (Ga). The Precambrian basement rocks of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bentonite
Bentonite ( ) is an Absorption (chemistry), absorbent swelling clay consisting mostly of montmorillonite (a type of smectite) which can either be Na-montmorillonite or Ca-montmorillonite. Na-montmorillonite has a considerably greater swelling capacity than Ca-montmorillonite. Bentonite usually forms from the weathering of volcanic ash in seawater, or by hydrothermal circulation through the porosity of volcanic ash beds, which converts (devitrification) the volcanic glass (obsidian, rhyolite, dacite) present in the ash into clay minerals. In the mineral alteration process, a large fraction (up to 40–50 wt.%) of amorphous silica is dissolution (chemistry), dissolved and leaching (agriculture), leached away, leaving the bentonite deposit in place. Bentonite beds are white or pale blue or green (traces of redox, reduced ) in fresh exposures, turning to a cream color and then yellow, red, or brown (traces of oxidation, oxidized ) as the exposure is weathered further. As a swel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydraulic Fracturing
Fracking (also known as hydraulic fracturing, fracing, hydrofracturing, or hydrofracking) is a well stimulation technique involving the fracturing of Formation (geology), formations in bedrock by a pressurized liquid. The process involves the high-pressure injection of "fracking fluid" (primarily water, containing sand or other hydraulic fracturing proppants, proppants suspended with the aid of thickening agents) into a wellbore to create cracks in the deep-rock formations through which natural gas, petroleum, and brine will flow more freely. When the hydraulic pressure is removed from the well, small grains of hydraulic fracturing proppants (either sand or aluminium oxide) hold the fractures open. Fracking, using either hydraulic pressure or acid, is the most common method for well stimulation. Well stimulation techniques help create pathways for oil, gas or water to flow more easily, ultimately increasing the overall production of the well. Both methods of fracking are classe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crawford, Nebraska
Crawford is a city in Dawes County, Nebraska, Dawes County, Nebraska, United States, in the Great Plains region. The population was 997 at the 2010 United States Census, 2010 census. It was incorporated in 1886 and was named for the late Captain Emmet Crawford, who had been stationed at nearby Fort Robinson. History The Fremont, Elkhorn and Missouri Valley Railroad reached Fort Robinson in 1886 on its way to Wyoming. Several miles east of the Fort, the railroad passed through a tree claim belonging to William Annin (also spelled "Annon"), who sold his claim for a new townsite. The "tent city" that sprang up around the railroad was named after Lt. Emmet Crawford, who had been formerly stationed at Fort Robinson but was killed in Mexico in January 1886. The town's original plat was filed on June 21, 1886 by the Western Townsite Company. E.A. Thompson and William D. Edger (editor of the original ''Crawford Clipper'') circulated a petition for Crawford to become a village, but upon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crow Butte
Crow Butte is a uranium mining operation located southeast of the city of Crawford in Dawes County, Nebraska, United States. Cameco Corporation owns and operates Crow Butte through its wholly owned subsidiary, Crow Butte Resources, Inc. History Crow Butte was the first uranium mine developed in Nebraska. It was discovered in 1980 and begin production in April 1991. It is a roll-front uranium deposit, mined using in-situ recovery (ISR). Due to weakening of the uranium market, production ceased in 2018. The project is under care and maintenance pending an improvement in uranium prices. Description At Crow Butte, uranium ore is mined in place underground in well fields. Uranium is extracted from basal Chadron Formation sandstone aquifers below the surface by the in-situ recovery process. A solution of water, oxygen and sodium bicarbonate (baking soda) is injected into the orebody, which liberates the uranium from its sandstone host and allows recovery by production wells. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleistocene
The Pleistocene ( ; referred to colloquially as the ''ice age, Ice Age'') is the geological epoch (geology), epoch that lasted from to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was finally confirmed in 2009 by the International Union of Geological Sciences, the cutoff of the Pleistocene and the preceding Pliocene was regarded as being 1.806 million years Before Present (BP). Publications from earlier years may use either definition of the period. The end of the Pleistocene corresponds with the end of the last glacial period and also with the end of the Paleolithic age used in archaeology. The name is a combination of Ancient Greek () 'most' and (; Latinized as ) 'new'. The aridification and cooling trends of the preceding Neogene were continued in the Pleistocene. The climate was strongly variable depending on the glacial cycle, oscillating between cold Glacial period, glacial periods and warmer Interglacial, int ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holocene
The Holocene () is the current geologic time scale, geological epoch, beginning approximately 11,700 years ago. It follows the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene together form the Quaternary period. The Holocene is an interglacial period within the ongoing Ice age, glacial cycles of the Quaternary, and is equivalent to Marine isotope stages, Marine Isotope Stage 1. The Holocene correlates with the last maximum axial tilt towards the Sun of the Earth#Axial tilt and seasons, Earth's obliquity. The Holocene corresponds with the rapid proliferation, growth, and impacts of the human species worldwide, including Recorded history, all of its written history, technological revolutions, development of major civilizations, and overall significant transition towards urban culture, urban living in the present. The human impact on modern-era Earth and its ecosystems may be considered of global significance for th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Platte River
The Platte River () is a major American river, in the state of Nebraska. It is about long; measured to its farthest source via its tributary, the North Platte River, it flows for over . The Platte River is a tributary of the Missouri River, which itself is a tributary of the Mississippi River, which flows to the Gulf of Mexico. The Platte over most of its length is a broad, shallow, meandering stream with a sandy bottom and many islands—a braided stream. The Platte is one of the most significant tributary systems in the watershed of the Missouri, draining a large portion of the central Great Plains in Nebraska and the eastern Rocky Mountains in Colorado and Wyoming. The river valley played an important role in the westward expansion of the United States, providing the route for several major emigrant trails, including the Oregon, California, Mormon and Bozeman trails. The first Europeans to see the Platte were French explorers and fur trappers about 1714; they first call ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shelton, Nebraska
Shelton is a village in Buffalo County, Nebraska, Buffalo and Hall County, Nebraska, Hall counties, Nebraska, United States. It is part of the Kearney, Nebraska Kearney micropolitan area, Micropolitan Statistical Area. The population was 1,059 at the United States Census, 2010, 2010 census. It is located west of Grand Island, Nebraska, Grand Island along both the Union Pacific Railroad and U.S. Route 30 in Nebraska, U.S. Route 30. Nebraska Link 10-D connects Shelton with Interstate 80 in Nebraska, Interstate 80. Geography According to the United States Census Bureau, the village has a total area of , all land. The downtown business district is situated near the banks of the Wood River (Nebraska), Wood River and the historic Lincoln Highway (now U.S. Highway 30) passes through Shelton. History Shelton, evolving from Wood River Centre, is one of the older communities in Nebraska. The first European settler to live in the area was a Mormon by the name of Joseph Johnson in 1858. Hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Missouri River
The Missouri River is a river in the Central United States, Central and Mountain states, Mountain West regions of the United States. The nation's longest, it rises in the eastern Centennial Mountains of the Bitterroot Range of the Rocky Mountains of southwestern Montana, then flows east and south for before entering the Mississippi River north of St. Louis, Missouri. The river drains Semi-arid climate, semi-arid Drainage basin, watershed of more than 500,000 square miles (1,300,000 km2), which includes parts of ten U.S. states and two Canadian provinces. Although a tributary of the Mississippi, the Missouri River is slightly longer and carries a comparable volume of water, though a fellow tributary (Ohio River) carries more water. When combined with the lower Mississippi River, it forms the List of rivers by length, world's fourth-longest river system. For over 12,000 years, people have depended on the Missouri River and its Tributary, tributaries as a source of sustena ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ogallala Aquifer
The Ogallala Aquifer () is a shallow water table aquifer surrounded by sand, silt, clay, and gravel located beneath the Great Plains in the United States. As one of the world's largest aquifers, it underlies an area of approximately in portions of eight states (South Dakota, Nebraska, Wyoming, Colorado, Kansas, Oklahoma, New Mexico, and Texas). It was named in 1898 by geologist N. H. Darton from its type locality near the town of Ogallala, Nebraska. The aquifer is part of the High Plains Aquifer System, and resides in the Ogallala Formation, which is the principal geologic unit underlying 80% of the High Plains. Large-scale extraction for agricultural purposes started after World War II due partially to center pivot irrigation and to the adaptation of automotive engines to power groundwater wells. Today about 27% of the irrigated land in the entire United States lies over the aquifer, which yields about 30% of the ground water used for irrigation in the United State ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
