|
Keweenawan Supergroup
The Keweenawan Supergroup is a supergroup of volcanic and sedimentary rocks that fill the Midcontinent Rift System in the U.S. states of Michigan, Wisconsin, and Minnesota. It is about thick and it formed about 1.1 billion years ago. Stratigraphy Members of the Keweenawan Supergroup are exposed at the surface only in the Lake Superior region, particularly at the perimeter of the Midcontinent Rift System. To the southeast and southwest, they are covered by sedimentary rocks of Paleozoic age. At its thickest, the supergroup consists of about of volcanic rocks overlain by about of sedimentary rocks.Nicholson, p. 505. The supergroup consists of the following members: Magnetism The Powder Mill Group is reversely polarized except for intervals at the base and top of the upper Kallander Creek Volcanics.Nicholson, pp. 507–8. The Portage Lake Volcanics and all younger formations have normal magnetic polarity.Nicholson, p. 508. References Bibliography *{{cite journal, last1=Nich ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Unit
A stratigraphic unit is a volume of rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features (facies) that characterize it. Units must be ''mappable'' and ''distinct'' from one another, but the contact need not be particularly distinct. For instance, a unit may be defined by terms such as "when the sandstone component exceeds 75%". Lithostratigraphic units Sequences of sedimentary and volcanic rocks are subdivided the basis of their shared or associated lithology. Formally identified lithostratigraphic units are structured in a hierarchy of lithostratigraphic rank, higher rank units generally comprising two or more units of lower rank. Going from smaller to larger in rank, the main lithostratigraphic ranks are Bed, Member, Formation, Group and Supergroup. Formal names of lithostratigraphic units are assigned by geological surveys. Units of formation or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hinckley Sandstone
Hinckley is a market town in south-west Leicestershire, England. It is administered by Hinckley and Bosworth Borough Council. Hinckley is the third largest settlement in the administrative county of Leicestershire, after Leicester and Loughborough. Hinckley is about halfway between Leicester and Coventry and borders Nuneaton in Warwickshire. Watling Street forms part of the Hinckley/Nuneaton border and the two towns are contiguous. Hinckley proper was recorded as having a population of 34,202, in the 2021 census. Hinckley is contiguous with the village of Burbage. The population of the combined urban area of Hinckley and Burbage was 50,712 in 2021. History In 2000, archaeologists from Northampton Archaeology discovered evidence of Iron Age and Romano-British settlement on land near Coventry Road and Watling Street. Hinckley has a recorded history going back to Anglo-Saxon times; the name Hinckley is Anglo-Saxon: "Hinck" is a personal name and "ley" is a meadow. By the ti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stratigraphy Of Michigan
Stratigraphy is a branch of geology concerned with the study of rock layers (strata) and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks. Stratigraphy has three related subfields: lithostratigraphy (lithologic stratigraphy), biostratigraphy (biologic stratigraphy), and chronostratigraphy (stratigraphy by age). Historical development Catholic priest Nicholas Steno established the theoretical basis for stratigraphy when he introduced the law of superposition, the principle of original horizontality and the principle of lateral continuity in a 1669 work on the fossilization of organic remains in layers of sediment. The first practical large-scale application of stratigraphy was by William Smith in the 1790s and early 19th century. Known as the "Father of English geology", Smith recognized the significance of strata or rock layering and the importance of fossil markers for correlating strata; he created the first geologic map o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geologic Groups Of Wisconsin
Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology, and so is treated as one major aspect of integrated Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the relative and absolute ages of rocks found in a given location, and also to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, and also to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Earth's past climates. Geologists broadly study the properties and processes of Earth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geologic Groups Of Minnesota
Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology, and so is treated as one major aspect of integrated Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the relative and absolute ages of rocks found in a given location, and also to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, and also to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Earth's past climates. Geologists broadly study the properties and processes of Ear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geologic Supergroups Of The United States
Geology () is a branch of natural science concerned with Earth and other Astronomical object, astronomical objects, the features or rock (geology), rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth science, Earth sciences, including hydrology, and so is treated as one major aspect of integrated Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the Relative dating, relative and Geochronology, absolute ages of rocks found in a given location, and also to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, and also to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Eart ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NRC Research Press
Canadian Science Publishing (CSP) is Canada's largest publisher of international scientific journals. It started in 1929 as the ''NRC Research Press'', part of the National Research Council (NRC). In 2010, the organization spun off from NRC and was incorporated as a not-for-profit. As of 2018, CSP has published about 2,300 articles annually in 24 journals distributed to over 125 countries. CSP has 50 staff members, and, according to the website Owler, its annual revenue is about US$3.7M. All of CSP's journals are produced and delivered in both HTML and PDF formats, is connected to scientific literature, included in all major indexes, and archived through both CLOCKSS and Portico. Open access CSP has an ''OpenArticle'' program, which permits authors and/or research funding agencies to sponsor online open access of their article. It also has auto-deposit of accepted manuscripts into the University of Toronto ''TSpace'', a free and secure research repository; and an adoption ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canadian Journal Of Earth Sciences
The ''Canadian Journal of Earth Sciences'' is a monthly peer-reviewed scientific journal established in 1963, which reports current research on all aspects of the Earth sciences. It is published by NRC Research Press. The journal also publishes special issues that focus on information and studies limited in scope to a specific segment of the Earth sciences. The editor-in-chief is Dr. Brendan Murphy (St. Francis Xavier University) and Sally Pehrsson (University of Saskatchewan). According to the ''Journal Citation Reports'', the journal has a 2020 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as ... of 1.369. References External links * {{Authority control Earth and atmospheric sciences journals Monthly journals Publications established in 1963 Canadian Scienc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geomagnetic Reversal
A geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged (not to be confused with geographic north and geographic south). The Earth's field has alternated between periods of ''normal'' polarity, in which the predominant direction of the field was the same as the present direction, and ''reverse'' polarity, in which it was the opposite. These periods are called '' chrons''. Reversal occurrences are statistically random. There have been at least 183 reversals over the last 83 million years (on average once every ~450,000 years). The latest, the Brunhes–Matuyama reversal, occurred 780,000 years ago, with widely varying estimates of how quickly it happened. Other sources estimate that the time that it takes for a reversal to complete is on average around 7,000 years for the four most recent reversals. Clement (2004) suggests that this duration is dependent on latitude, with shorter durations at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solor Church Formation
Solor is a volcanic island located off the eastern tip of Flores island in the Lesser Sunda Islands of Indonesia, in the Solor Archipelago. The island supports a small population that has been whaling for hundreds of years. They speak the languages of Adonara and Lamaholot. There are at least five volcanoes on this island which measures only by . The island's area is , and it had a population of 34,029 at the 2020 Census. The official estimate as at mid 2021 was 35,045. Administrative Districts The island is divided into three districts (''kecamatan''), tabulated below with their areas (in km2) and their populations at the 2010 Census and 2020 Census, together with the official estimates as at mid 2021. The entire island is administered by the East Flores Regency. History of European contact In 1520, the Portuguese established a trading post in the village of Lamakera on the eastern side of the island as a transit harbor between Maluku and Portuguese Malacca. In 1562, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reservation River Diabase Complex
__NOTOC__ Reservation may refer to: Places Types of places: * Indian reservation, in the United States * Military base, often called reservations * Nature reserve Government and law * Reservation (law), a caveat to a treaty * Reservation in India, a government policy imposing quotas for political representation * Disallowance and reservation, a constitutional power in several Commonwealth nations Arts, entertainment, and media * ''Reservation'' (mixtape), a mixtape by Angel Haze * "Reservations", a song by Spoon from their album '' A Series of Sneaks'' * "Reservations", a song by Wilco from their album ''Yankee Hotel Foxtrot'' Other uses * Reserved sacrament or Reservation of the Sacrament, a Christian religious practice * Table reservation, for restaurant seating * Computer reservation system, for travel and accommodations See also * Reserve (other) * Indian reserve, in Canada * Indigenous territory (other) An indigenous territory is an area of land set asid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
