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Sexton Creek Limestone
The Hunton Megagroup also Hunton Super Group, Hunton Group, Hunton Formation and Hunton Limestone is predominantly composed of carbonate rock, deposited between the Silurian and early to mid Devonian periods. In many States it acts as a reservoir for both hydrocarbons and water. Stratigraphy Clifty Limestone The Clifty Limestone is a Middle Devonian geologic formation in the Ozark Plateaus of Arkansas. This thin formation can but up to 4 feet thick. The name was introduced in 1916 by Albert Homer Purdue and Hugh Dinsmore Miser in their study of northern Arkansas. They designated a stratotype along the East Fork of Little Clifty Creek in Benton County, Arkansas. The Clifty Limestone is very sandy, light blue to bluish grey. Penters Chert The Penters Chert is a Devonian geologic formation in the Ozark Plateaus of Arkansas. Its thickness ranges up to 90'. The name was introduced in 1921 by Hugh Dinsmore Miser in his study of Arkansas. Miser designated a type locality near th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhuddanian
In the geologic timescale, the Rhuddanian is the first age of the Silurian Period and of the Llandovery Epoch. The Silurian is in the Paleozoic Era of the Phanerozoic Eon. The Rhuddanian Age began 443.8 ± 1.5 Ma and ended 440.8 ± 1.2 Ma (million years ago). It succeeds the Hirnantian Age (the last age of the Ordovician Period) and precedes the Aeronian Age. GSSP The GSSP for the Silurian is located in a section at Dob's Linn, Scotland, in an artificial excavation created just north of the Linn Branch Stream. Two lithological units ( formations) occur near the boundary. The lower is the Hartfell Shale ( thick), consisting chiefly of pale gray mudstone with subordinate black shales and several interbedded meta-bentonites. Above this is the thick Birkhill Shale, which consist predominantly of black graptolitic shale with subordinate gray mudstones and meta-bentonites. The name is given after Cefn-Rhuddan Farm, Llandovery in Carmarthenshire, Wales Wales ( ) is a Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbonate Rock
Carbonate rocks are a class of sedimentary rocks composed primarily of carbonate minerals. The two major types are limestone, which is composed of calcite or aragonite (different crystal forms of CaCO3), and Dolomite (rock), dolomite rock (also known as dolostone), which is composed of Dolomite (mineral), dolomite (CaMg(CO3)2). They are usually Dunham classification, classified on the basis of texture and grain size. Importantly, carbonate rocks can exist as metamorphic and igneous rocks, too. When recrystallized carbonate rocks are Metamorphic rock, metamorphosed, marble is created. Rare igneous rock, igneous carbonate rocks even exist as Intrusive rock, intrusive carbonatites and, even rarer, there exists volcanic carbonate lava. Carbonate rocks are also crucial components to understanding Geological history of Earth, geologic history due to processes such as diagenesis in which carbonates undergo compositional changes based on kinetic effects. The correlation between this compo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acodus
''Acodus'' is an extinct genus of conodonts. Species * ''A. acutus'' * ''A. campanula'' * ''A. crassus'' * ''A. delicatus'' * ''A. deltatus'' * ''A. erectus'' * ''A. firmus'' * ''A. jonesi'' * ''A. kechikaensis'' * ''A. neodeltatus'' * ''A. oneotensis'' * ''A. planus'' * ''A. primitivus'' * ''A. sigmoideus'' * ''A. similaris'' * ''A. tripterolobus'' * ''A. zeballus'' Distribution Fossils of ''Acodus'' have been found in Argentina, Canada (Ontario, Quebec, British Columbia, Northwest Territories, Nunavut), China, Colombia ( Tarqui, Huila),Moreno et al., 2008, p.10 the Czech Republic, Estonia, Iran, Kazakhstan, Malaysia, the Russian Federation, Spain, Sweden, Thailand, the United Kingdom, and the United States (Indiana, New York, Tennessee, Nevada, Kentucky, Missouri, Ohio, Utah).''Acodus'' at |
Conodont
Conodonts, are an extinct group of marine jawless vertebrates belonging to the class Conodonta (from Ancient Greek κῶνος (''kōnos''), meaning " cone", and ὀδούς (''odoús''), meaning "tooth"). They are primarily known from their hard, mineralised tooth-like structures called "conodont elements" that in life were present in the oral cavity and used to process food. Rare soft tissue remains suggest that they had elongate eel-like bodies with large eyes. Conodonts were a long-lasting group with over 300 million years of existence from the Cambrian (over 500 million years ago) to the beginning of the Jurassic (around 200 million years ago). Conodont elements are highly distinctive to particular species and are widely used in biostratigraphy as indicative of particular periods of geological time. Discovery and understanding of conodonts The teeth-like fossils of the conodont were first discovered by Heinz Christian Pander and the results published in Saint Petersburg, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mississippi River
The Mississippi River is the main stem, primary river of the largest drainage basin in the United States. It is the second-longest river in the United States, behind only the Missouri River, Missouri. From its traditional source of Lake Itasca in northern Minnesota, it flows generally south for to the Mississippi River Delta in the Gulf of Mexico. With its many tributaries, the Mississippi's Drainage basin, watershed drains all or parts of 32 U.S. states and two Canadian provinces between the Rocky Mountains, Rocky and Appalachian Mountains, Appalachian mountains. The river either borders or passes through the states of Minnesota, Wisconsin, Iowa, Illinois, Missouri, Kentucky, Tennessee, Arkansas, Mississippi, and Louisiana. The main stem is entirely within the United States; the total drainage basin is , of which only about one percent is in Canada. The Mississippi ranks as the world's List of rivers by discharge, tenth-largest river by discharge flow, and the largest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Izard County, Arkansas
Izard County () is a County (United States), county located in the U.S. state of Arkansas. As of the 2020 United States census, 2020 census, the population was 13,577. The county seat is Melbourne, Arkansas, Melbourne. Izard County is Arkansas's 13th county, formed on October 27, 1825, and named for War of 1812 General and Arkansas Territory, Arkansas Territorial Governor George Izard. It is an alcohol prohibition or dry county. Geography According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.6%) is water. Major highways * Arkansas Highway 5 * Arkansas Highway 9 * Arkansas Highway 56 * Arkansas Highway 58 * Arkansas Highway 69 * Arkansas Highway 69 Business * Arkansas Highway 177 * Arkansas Highway 223 * Arkansas Highway 289 * Arkansas Highway 354 Adjacent counties *Fulton County, Arkansas, Fulton County (north) *Sharp County, Arkansas, Sharp County (east) *Independence County, Arkansas, Independence County (southeast) *Stone County, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Benton County, Arkansas
Benton County is a county in the Northwest region of the U.S. state of Arkansas. Created as Arkansas' 35th county on September 30, 1836, Benton County contains thirteen incorporated municipalities, including Bentonville, the county seat, and Rogers, the most populous city. The county was named after Thomas Hart Benton, a U.S. Senator from Missouri influential in Arkansas statehood. The county is located within the Springfield Plateau of the Ozarks. Much of eastern Benton County is located along Beaver Lake, a reservoir of the White River. The county contains three protected areas: Logan Cave National Wildlife Refuge, Pea Ridge National Military Park, and Devil's Eyebrow Natural Area, as well as parts of the Ozark National Forest, Hobbs State Park – Conservation Area, and two state wildlife management areas. Benton County occupies and contained a population of 284,333 people in 100,749 households as of the 2020 Census, ranking it tenth in size and second in popul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stratotype
In geology, a stratotype or type section is the physical location or outcrop of a particular reference exposure of a stratigraphic sequence or stratigraphic boundary. If the stratigraphic unit is layered, it is called a stratotype, whereas the standard of reference for unlayered rocks is the type locality. Also it can be defined as "The particular sequence of strata chosen as standard of reference of a layered stratigraphic unit." When a stratigraphic unit is nowhere fully exposed, the original type section may be supplemented with reference sections covering the full thickness of the unit. A reference section may also be defined when the original type section is poorly exposed, or for historical units which were designated without specifying a type section according to more modern standards. See also * Global Boundary Stratotype Section and Point A Global Boundary Stratotype Section and Point (GSSP), sometimes referred to as a golden spike, is an internationally agre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ozark Plateau
The Ozarks, also known as the Ozark Mountains, Ozark Highlands or Ozark Plateau, is a physiographic region in the U.S. states of Missouri, Arkansas, and Oklahoma, as well as a small area in the southeastern corner of Kansas. The Ozarks cover a significant portion of northern Arkansas and most of the southern half of Missouri, extending from Interstate 40 in central Arkansas to Interstate 70 in central Missouri. There are two mountain ranges in the Ozarks: the Boston Mountains of Arkansas and Oklahoma, as well as the St. Francois Mountains of Missouri. Wahzhazhe Summit (formerly known as Buffalo Lookout), is the highest point in the Ozarks at , and is located in the Boston Mountains, in the westernmost part of Newton County, Arkansas, east of Boston, Madison County, Arkansas. Geologically, the area is a broad dome with the exposed core in the ancient St. Francois Mountains. The Ozarks cover nearly , making it the most extensive highland region between the Appalachi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
