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Gravelbourg Formation
The Gravelbourg Formation is a stratigraphical unit of Bajocian age in the Western Canadian Sedimentary Basin. It takes the name from the town of Gravelbourg, and was first described in well ''Tidewater Eastend Crown No. 1'' by R.L. Milner and G.E. Thomas in 1954.Milner, R.L. and Thomas, G E., 1954. Jurassic System in Saskatchewan. In: Western Canada Sedimentary Basin, American Association of Petroleum Geologists, p. 250-267 Lithology The Gravelbourg Formation is divided in two members, Lower and Upper Gravelbourg. The lower member is composed of dolomitic limestone with green shale laminations in the upper part, chalcedonic chert and anhydrite in the lower part and a basal shale bed with fish scales and anhydrite. The upper Gravelbourg consists of dark shale with sandstone and argillaceous limestone stringers and a tan mudstone bed at the top. Distribution The Gravelbourg Formation reaches a maximum thickness of in the Williston Basin. At its type locality in southweste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Formation
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics (lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness (geology), thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dolomite (mineral)
Dolomite () is an anhydrous carbonate mineral composed of calcium magnesium carbonate, ideally The term is also used for a sedimentary carbonate rock composed mostly of the mineral dolomite. An alternative name sometimes used for the dolomitic rock type is dolostone. History As stated by Nicolas-Théodore de Saussure the mineral dolomite was probably first described by Carl Linnaeus in 1768. In 1791, it was described as a rock by the French naturalist and geologist Déodat Gratet de Dolomieu (1750–1801), first in buildings of the old city of Rome, and later as samples collected in the mountains now known as the Dolomite Alps of northern Italy. Nicolas-Théodore de Saussure first named the mineral (after Dolomieu) in March 1792. Properties The mineral dolomite crystallizes in the trigonal-rhombohedral system. It forms white, tan, gray, or pink crystals. Dolomite is a double carbonate, having an alternating structural arrangement of calcium and magnesium ions. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reston Formation
Reston may refer to: Places *Reston, Florida, an unincorporated community in Florida, United States *Reston, Lincolnshire, a parish in England *Reston, Manitoba, a small community in southwestern Manitoba, Canada *Reston Scar, a fell in Cumbria, England *Reston, Scottish Borders, a village in the southeast of Scotland **Reston railway station *Reston, Virginia, a census-designated place in Fairfax County, Virginia, United States Other uses *Reston (surname) * Reston foam, a 3M surgical dressing; see auricular splint *Reston Group, a Silurian to Devonian lithostratigraphic group *Reston Publishing, a defunct imprint of Prentice Hall *Reston virus, a form of ''Ebolavirus'' See also *Reston Parkway (other) Reston Parkway may refer to two things related to the town of Reston, Virginia, US: * Virginia State Route 602 (Fairfax County), a highway *Reston Town Center station Reston Town Center station (preliminary name Reston Parkway) is a rapid trans ... * Reston Station ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alberta
Alberta ( ) is one of the thirteen provinces and territories of Canada. It is part of Western Canada and is one of the three prairie provinces. Alberta is bordered by British Columbia to the west, Saskatchewan to the east, the Northwest Territories (NWT) to the north, and the U.S. state of Montana to the south. It is one of the only two landlocked provinces in Canada (Saskatchewan being the other). The eastern part of the province is occupied by the Great Plains, while the western part borders the Rocky Mountains. The province has a predominantly continental climate but experiences quick temperature changes due to air aridity. Seasonal temperature swings are less pronounced in western Alberta due to occasional Chinook winds. Alberta is the fourth largest province by area at , and the fourth most populous, being home to 4,262,635 people. Alberta's capital is Edmonton, while Calgary is its largest city. The two are Alberta's largest census metropolitan areas. More than ... [...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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manitoba
, image_map = Manitoba in Canada 2.svg , map_alt = Map showing Manitoba's location in the centre of Southern Canada , Label_map = yes , coordinates = , capital = Winnipeg , largest_city = Winnipeg , largest_metro = Winnipeg Region , official_lang = English , government_type = Parliamentary constitutional monarchy , Viceroy = Anita Neville , ViceroyType = Lieutenant Governor , Premier = Heather Stefanson , Legislature = Legislative Assembly of Manitoba , area_rank = 8th , area_total_km2 = 649950 , area_land_km2 = 548360 , area_water_km2 = 101593 , PercentWater = 15.6 , population_demonym = Manitoban , population_rank = 5th , population_total = 1342153 , population_as_of = 2021 , population_est = 14 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southern Alberta
Southern Alberta is a region located in the Canadian province of Alberta. In 2004, the region's population was approximately 272,017.Southwest Regional. Marketplace Profile AlbertaFirst.com. Accessed 22 December 2006. AlbertaFirst.com. Accessed 22 December 2006. The primary cities are Lethbridge and Medicine Hat. The region is known mostly for agricultural production ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sweetgrass Arch
Sweet grass or sweetgrass may refer to: Plants * ''Hierochloe odorata'' (sweet grass or holy grass), from northern North America and Eurasia * Sweet-grass or mannagrass, any of the many species in the genus ''Glyceria'' * ''Anthoxanthum odoratum'', Sweet vernal grass, native to Eurasia * ''Muhlenbergia sericea'', synonym ''Muhlenbergia filipes'', native to the southeastern United States * colloquially for ''Cannabis'', a psychoactive plant Places * Sweet Grass, Montana, United States * Sweet Grass County, Montana, United States * Sweet Grass Creek, Montana, United States * Sweet Grass Hills, Montana, United States * Sweet Grass, Edmonton, Canada * Sweetgrass First Nation, Saskatchewan, Canada Other uses * Sweet Grass (Cree chief) Sweet Grass (also Sweetgrass or Wikaskokiseyin or Wihaskokiseyin) ( – on or shortly before January 11, 1877) was a chief of the Cree in the 1860s and 1870s in western Canada. He worked with other chiefs and bands to participate in raids with ... (1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saskatchewan
Saskatchewan ( ; ) is a province in western Canada, bordered on the west by Alberta, on the north by the Northwest Territories, on the east by Manitoba, to the northeast by Nunavut, and on the south by the U.S. states of Montana and North Dakota. Saskatchewan and Alberta are the only landlocked provinces of Canada. In 2022, Saskatchewan's population was estimated at 1,205,119. Nearly 10% of Saskatchewan’s total area of is fresh water, mostly rivers, reservoirs and lakes. Residents primarily live in the southern prairie half of the province, while the northern half is mostly forested and sparsely populated. Roughly half live in the province's largest city Saskatoon or the provincial capital Regina. Other notable cities include Prince Albert, Moose Jaw, Yorkton, Swift Current, North Battleford, Melfort, and the border city Lloydminster. English is the primary language of the province, with 82.4% of Saskatchewanians speaking English as their first language. Saska ... [...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] |
Lexicon Of Canadian Geologic Units
The Lexicon of Canadian Geologic Units, also called the Lexicon of Canadian Geological Names or simply the Lexicon, is an online database provided by the Government of Canada. It includes the names of more than 16,000 geologic units throughout Canada, as well as information about each geologic unit from several sources. The names of these geologic units may be formal, informal or undefined; they may also be obsolete or currently in use. The Lexicon of Canadian Geologic Units includes both lithological units and chronological Chronology (from Latin ''chronologia'', from Ancient Greek , ''chrónos'', "time"; and , ''-logia'') is the science of arranging events in their order of occurrence in time. Consider, for example, the use of a timeline or sequence of events. It ... units, the latter of which may be searched only by age or name. In addition to age and name, geologic units in the Lexicon may also be searched by first citation, by source data set or by province or territory. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mudstone
Mudstone, a type of mudrock, is a fine-grained sedimentary rock whose original constituents were clays or muds. Mudstone is distinguished from ''shale'' by its lack of fissility (parallel layering).Blatt, H., and R.J. Tracy, 1996, ''Petrology.'' New York, New York, W. H. Freeman, 2nd ed, 529 pp. The term ''mudstone'' is also used to describe carbonate rocks ( limestone or dolomite) that are composed predominantly of carbonate mud. However, in most contexts, the term refers to siliciclastic mudstone, composed mostly of silicate minerals. The NASA Curiosity rover has found deposits of mudstone on Mars that contain organic substances such as propane, benzene and toluene. Definition There is not a single definition of mudstone that has gained general acceptance,Boggs 2006, p.143 though there is wide agreement that mudstones are fine-grained sedimentary rocks, composed mostly of silicate grains with a grain size less than . Individual grains this size are too small to be distin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
