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Kelly Limestone
The Kelly Limestone is a geologic formation in New Mexico, United States. Its fossil assemblage is characteristic of the Early to Middle Mississippian. Description The Kelly Limestone consists of approximately of marine limestone. It is found in the Lemitar, Ladron, and Magdalena Mountains of west-central New Mexico, US. The formation rests on Precambrian basement rock and is overlain by the Sandia Formation. The Kelly Limestone is divided into a lower Calosa Member and an upper Ladron Member, which are separated by an unconformity. The Kelly Limestone likely correlates with the Arroyo Penasco Group in northern New Mexico and the Leadville Limestone of Colorado. These were deposited in a major marine transgression (advance of the ocean across the continent) in the Mississippian. Fossil content The formation contains fossil conodonts indicating that it ranges from Tournaisian to Visean (Early to Middle Mississippian) in age. The lower Caloso Member contains fos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formation (stratigraphy)
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 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 Abraham Gottlob W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leadville Limestone
The Leadville Limestone is a Mississippian (geology), Mississippian Formation (geology), geologic formation in the western United States.Geologic map of the Marble quadrangle, Gunnison and Pitkin Counties, Colorado Gaskill, D.L., and Godwin, L.H., 1966. USGS Geologic Quadrangle Map GQ-512. Map Scale: 1:24,000. In Colorado, the upper part is Ooid, oolitic limestone, while the lower part is primarily dolomite (rock), dolomite, and somewhat sandy beds indicate the bottom of the formation. The formation is sparsely fossil, fossiliferous but contains many calcareous algae, Foraminifera (''Endothyracea, Endothyra''), Porifera, sponges, Anthozoa, corals (''Syringopora''), Bryozoa, many Brachiopoda, brachiopods, Gastropoda, gastropods (''Bellerophon (genus), Bellerophon'', ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhipidomella
''Rhipidomella'' is an extinct genus of brachiopod belonging to the order Orthida and family Rhipidomellidae. Specimens have been found in Carboniferous to Permian beds in southwest Asia, the Moscow Basin, and North America. Species *''R. cora'' d'Orbigny 1842 *''R. dubia'' Hall 1856 *''R. lyelliana'' De Koninck 1851 References Paleozoic life Spiriferida {{Brachiopod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fusulinid
The Fusulinida is an extinct order within the Foraminifera in which the tests are traditionally considered to have been composed of microgranular calcite. Like all forams, they were single-celled organisms. In advanced forms the test wall was differentiated into two or more layers. Loeblich and Tappan, 1988, gives a range from the Lower Silurian to the Upper Permian, with the fusulinid foraminifera going extinct with the Permian–Triassic extinction event. While the latter is true, a more supported projected timespan is from the Mid-Carboniferous period. Taxonomy Thirteen superfamilies are presently recognised, based on taxa (families) included in the three superfamilies given in the Treatise. Three are based on families in the Parathuramminacea, 1964, and 2.9 million families in the Endothyracea, 1964. The Fusulinacea remains the same in both sources (Treatise 1964 and Loeblich and Tappan, 1988). The term fusulinata has traditionally been used to refer to all palaeozoic for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spirifer
''Spirifer'' is a genus of marine brachiopods belonging to the order Spiriferida and family Spiriferidae. Species belonging to the genus lived from the Middle Ordovician ( Sandbian) through to the Middle Triassic (Carnian) with a global distribution. They were stationary epifaunal suspension feeders.''Spirifer'' at .org Selected species * '' Spirifer acutiplicatus'' Hayasaka, 1933 * '' Spirifer bambadhurensis'' Diener, 1903 * ''[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beecheria
''Beecheria'' is an extinct genus of brachiopod belonging to the order Terebratulida and family Beecheriidae. Fossils of this genus have been found in Mississippian (geology), Mississippian to Permian beds in Eurasia, Australia, North America, and South America. The genus was part of the ''Levipustula'' fauna characteristic of cold water conditions. "Nests" of ''Beecheria'' have been found in fossil low temperature hydrothermal vent communities from the early Carboniferous in Newfoundland. Species *''B. angusta'' Netschajew 1894 *''B. boranelensis'' Peou and Engel 1979 *''B. chouteauensis'' Weller 1914 *''B. curva'' Smirnova 2009 *''B. elliptica'' Cooper and Grant 1976 *''B. expansa'' Cooper and Grant 1976 *''B. kargaliensis'' Smirnova 2007 *''B. lidarensis'' Diener 1915 *''B. magna'' Jin and Ye 1979 *''B. netschajewi'' Grigor'yeva 1967 *''B. samarica'' Smirnova 2007 References Paleozoic life Spiriferida {{Brachiopod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brachiopods
Brachiopods (), phylum Brachiopoda, are a phylum of trochozoan animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear end, while the front can be opened for feeding or closed for protection. Two major categories are traditionally recognized, articulate and inarticulate brachiopods. The word "articulate" is used to describe the tooth-and-groove structures of the valve-hinge which is present in the articulate group, and absent from the inarticulate group. This is the leading diagnostic skeletal feature, by which the two main groups can be readily distinguished as fossils. Articulate brachiopods have toothed hinges and simple, vertically-oriented opening and closing muscles. Conversely, inarticulate brachiopods have weak, untoothed hinges and a more complex system of vertical and oblique (diagonal) muscles used to keep the two valves aligned. In many brachiopods, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tournaisian
The Tournaisian is in the ICS geologic timescale the lowest stage or oldest age of the Mississippian, the oldest subsystem of the Carboniferous. The Tournaisian age lasted from Ma to Ma. It is preceded by the Famennian (the uppermost stage of the Devonian) and is followed by the Viséan. Name and regional alternatives The Tournaisian was named after the Belgian city of Tournai. It was introduced in scientific literature by Belgian geologist André Hubert Dumont in 1832. Like many Devonian and lower Carboniferous stages, the Tournaisian is a unit from West European regional stratigraphy that is now used in the official international time scale. The Tournaisian correlates with the regional North American Kinderhookian and lower Osagean stages and the Chinese Tangbagouan regional stage. In British stratigraphy, the Tournaisian contains three substages: the Hastarian, Ivorian and lower part of the Chadian (the upper part falls in the Viséan). Stratigraphy The base of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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