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Valentine Formation
The Valentine Formation is a geologic unit formation or member within the Ogallala unit in northcentral Nebraska near the South Dakota border. It preserves fossils dating to the Neogene period and is particularly noted for Canid fossils. A particular feature of the Valentine is lenticular beds of green-gray opaline sandstone that can be identified in other states, including South Dakota, Nebraska, Kansas, and Colorado. Even though three mammalian fauna stages can be mapped throughout the range of the Ogallala, no beddings of the Ogallala are mappable and all attempts of ''formally'' applying the Valentine to any mappable lithology beyond the type location have been abandoned. Even so, opaline sandstone has been used to refer to the green-gray opalized conglomerate sandstone that is a particular feature of the lower Ogallala. Development, the earliest Ogallala deposits At the beginning of the Ogallala times, as sediments began washing out from the rising Rocky Mountains int ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Opal
Opal is a hydrated amorphous form of silica (SiO2·''n''H2O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. The name ''opal'' is believed to be derived from the Sanskrit word (), which means 'jewel', and later the Greek derivative (), which means 'to see a change in color'. There are two broad classes of opal: precious and common. Precious opal displays play-of-color ( iridescence); common opal does not. Play-of-color is defined as "a pseudo chromatic optical effect resulting in flashes of colored light from certain minerals, as they are turned in white light." The internal structure of precious opal causes it to di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kansas
Kansas () is a state in the Midwestern United States. Its capital is Topeka, and its largest city is Wichita. Kansas is a landlocked state bordered by Nebraska to the north; Missouri to the east; Oklahoma to the south; and Colorado to the west. Kansas is named after the Kansas River, which in turn was named after the Kansa Native Americans who lived along its banks. The tribe's name (natively ') is often said to mean "people of the (south) wind" although this was probably not the term's original meaning. For thousands of years, what is now Kansas was home to numerous and diverse Native American tribes. Tribes in the eastern part of the state generally lived in villages along the river valleys. Tribes in the western part of the state were semi-nomadic and hunted large herds of bison. The first Euro-American settlement in Kansas occurred in 1827 at Fort Leavenworth. The pace of settlement accelerated in the 1850s, in the midst of political wars over the slavery debate. Wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inverted Relief
Inverted relief, inverted topography, or topographic inversion refers to landscape features that have reversed their elevation relative to other features. It most often occurs when low areas of a landscape become filled with lava or sediment that hardens into material that is more resistant to erosion than the material that surrounds it. ''Differential erosion'' then removes the less resistant surrounding material, leaving behind the younger resistant material, which may then appear as a ridge where previously there was a valley. Terms such as "inverted valley" or "inverted channel" are used to describe such features.Pain, C.F., and C.D. Ollier, 1995, ''Inversion of relief - a component of landscape evolution.'' Geomorphology. 12(2):151-165. Inverted relief has been observed on the surfaces of other planets as well as on Earth. For example, well-documented inverted topographies have been discovered on Mars.Pain, C.F., J.D.A. Clarke, and M. Thomas, 2007, ''Inversion of relief on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rooks County, Kansas
Rooks County (standard abbreviation: RO) is a county located in the U.S. state of Kansas. As of the 2020 census, the county population was 4,919. The county seat is Stockton, and the largest city is Plainville. The county was named for Private John C. Rooks of the 11th Kansas Infantry who died at the Battle of Prairie Grove near Fayetteville, Arkansas, during the Civil War. History Early history For many millennia, the Great Plains of North America was inhabited by nomadic Native Americans. From the 16th century to 18th century, the Kingdom of France claimed ownership of large parts of North America. In 1762, after the French and Indian War, France secretly ceded New France to Spain, per the Treaty of Fontainebleau. 19th century In 1802, Spain returned most of the land to France, but keeping title to about 7,500 square miles. In 1803, most of the land for modern day Kansas was acquired by the United States from France as part of the 828,000 square mile Louisiana Purc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graham County, Kansas
Graham County (county code GH) is a county located in the U.S. state of Kansas. As of the 2020 census, the county population was 2,415. Its county seat and most populous city is Hill City. The county is home to Nicodemus, founded 1877, which is the only remaining western town established by African Americans during the Reconstruction Period following the American Civil War. History Early history For many millennia, the Great Plains of North America was inhabited by nomadic Native Americans. From the 16th century to 18th century, the Kingdom of France claimed ownership of large parts of North America. In 1762, after the French and Indian War, France secretly ceded New France to Spain, per the Treaty of Fontainebleau. 19th century In 1802, Spain returned most of the land to France, but keeping title to about 7,500 square miles. In 1803, most of the land for modern day Kansas was acquired by the United States from France as part of the 828,000 square mile Louisiana Purcha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rush County, Kansas
Rush County (standard abbreviation: RH) is a county located in the U.S. state of Kansas. As of the 2020 census, the county population was 2,956. The largest city and county seat is La Crosse. History Early history For many millennia, the Great Plains of North America was inhabited by nomadic Native Americans. From the 16th century to 18th century, the Kingdom of France claimed ownership of large parts of North America. In 1762, after the French and Indian War, France secretly ceded New France to Spain, per the Treaty of Fontainebleau. 19th century In 1802, Spain returned most of the land to France, but keeping title to about 7,500 square miles. In 1803, most of the land for modern day Kansas was acquired by the United States from France as part of the 828,000 square mile Louisiana Purchase for 2.83 cents per acre. In 1854, the Kansas Territory was organized, then in 1861 Kansas became the 34th U.S. state. In 1867, Rush County was established. Rush County was organiz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Opal
Opal is a hydrated amorphous form of silica (SiO2·''n''H2O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. The name ''opal'' is believed to be derived from the Sanskrit word (), which means 'jewel', and later the Greek derivative (), which means 'to see a change in color'. There are two broad classes of opal: precious and common. Precious opal displays play-of-color ( iridescence); common opal does not. Play-of-color is defined as "a pseudo chromatic optical effect resulting in flashes of colored light from certain minerals, as they are turned in white light." The internal structure of precious opal causes it to di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carlile Shale
The Carlile Shale is a Turonian age Upper/Late Cretaceous series shale geologic formation in the central-western United States, including in the Great Plains region of Colorado, Kansas, Nebraska, New Mexico, North Dakota, South Dakota, and Wyoming. Description The formation is composed of marine deposits of the generally retreating phase (hemi-cycle) of the Greenhorn cycle of the Western Interior Seaway, which followed the advancing phase of the same cycle that formed the underlying Graneros Shale and Greenhorn Formation. As such, the lithology progresses from open ocean chalky shale (with thin limestones) to increasing carbonaceous shale to near-shore sandstone. The contact between the Carlile Shale and the overlying Niobrara Formation is marked by an unconformity in much of the outcrop area, but where an unconformity is not discernible, the boundary is typically placed at the first resistant, fine-grained limestone bed at the base of the Niobrara Formation. Fossil content ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Niobrara River
The Niobrara River (; oma, Ní Ubthátha khe, , literally "water spread-out horizontal-the" or "The Wide-Spreading Water") is a tributary of the Missouri River, approximately long,U.S. Geological Survey. Many early settlers, such as Mari Sandoz, referred to the river as Running Water. National Hydrography Dataset high-resolution flowline dataThe National Map accessed March 30, 2011 running through the U.S. states of Wyoming and Nebraska."Nature & Science". Retrieved 2011-03-10. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Republican River
The Republican River is a river in the central Great Plains of North America, rising in the High Plains (United States), High Plains of eastern Colorado and flowing east U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed March 25, 2011 through the U.S. states of Nebraska and Kansas. Geography The Republican River is formed by the confluence of the North Fork Republican River and the Arikaree River just north of Haigler, Nebraska, Haigler in Dundy County, Nebraska. It joins with the South Fork Republican River immediately southeast of Benkelman, Nebraska. All three tributaries originate in the High Plains (United States), High Plains of northeastern Colorado. From the confluence, the river flows generally eastward along the southern border of Nebraska, passing through Trenton Dam, Swanson Reservoir and Harlan County Reservoir before curving southward into the Smoky Hills region of Kansas. The Republican River joins the Smoky H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solomon River
The Solomon River, often referred to as the "Solomon Fork", is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed March 29, 2011 river in the central Great Plains of North America. The entire length of the river lies in the U.S. state of Kansas. It is a tributary of the Smoky Hill River. Names The Native name for the river was Nepaholla, meaning "Water on the Hill" in reference to Waconda Spring which was located in the river valley. In 1744, French explorers named the river ''Salmon'', later corrupted into ''Solomon'', after Edme Gatien de Salmon, a prominent colonial official of French Louisiana at the time. Other names for the river include Mahkineohe, Riviere de Soucis, Solomons Creek, Wiskapalla River, and Solomons Fork. Geography The Solomon River is formed by the confluence of the North Fork Solomon River and South Fork Solomon River at Waconda Lake in northwestern Mitchell County, Kansas. Both forks originat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Smoky Hill River
The Smoky Hill River is a river in the central Great Plains of North America, running through Colorado and Kansas.Smoky Hill River. (2009). In Encyclopædia Britannica. Retrieved July 22, 2009, from Encyclopædia Britannica Online: http://www.britannica.com/EBchecked/topic/550068/Smoky-Hill-River Names The Smoky Hill gets its name from the Smoky Hills region of north-central Kansas through which it flows. Indigenous peoples of the Americas, American Indians living along the Smoky Hill considered it and the Kansas River to be the same river, and their names for it included Chetolah and Okesee-sebo. Early maps of European explorers called the river (also in combination with the Kansas River) the River of the Padoucas as its source is located in what was then Padouca (Comanche) territory. The USGS lists a number of other variant names for the Smoky Hill River, including Chitolah River, Fork of the Hill Buckaneuse, La Fourche de la Cote Boucaniere, La Touche de la Cote Bucanieus, M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
