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Loma Gorda Formation
The Loma Gorda Formation ( es, Formación Loma Gorda, Kl, Kslg) is a fossiliferous geological formation of the Upper Magdalena Valley (VSM) and surrounding Central and Eastern Ranges of the Colombian Andes, extending from Cundinamarca in the north to Huila and easternmost Tolima in the south. The uppermost unit of the Güagüaquí Group, a sequence of laminated siltstones and shales, dates to the Late Cretaceous period; Turonian to Coniacian epochs, and has a maximum thickness of . Etymology The formation was named in 1966 by De Porta, named Loma Gorda ("Fat Hill") in Ricaurte, Cundinamarca.Acosta & Ulloa, 2002, p.23 Description Lithologies The Loma Gorda Formation is characterised by laminated siltstones and shales with calcareous concretions.Acosta & Ulloa, 2002, p.24 The formation has provided fossils of '' Ankinatsytes venezolanus'', '' Barroisiceras onilahyense'', '' Codazziceras ospinae'', '' Eulophoceras jacobi'', ''Fagesia catinus'', '' Hauericeras madagascaren ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turonian
The Turonian is, in the ICS' geologic timescale, the second age in the Late Cretaceous Epoch, or a stage in the Upper Cretaceous Series. It spans the time between 93.9 ± 0.8 Ma and 89.8 ± 1 Ma (million years ago). The Turonian is preceded by the Cenomanian Stage and underlies the Coniacian Stage. At the beginning of the Turonian an oceanic anoxic event (OAE 2) took place, also referred to as the Cenomanian-Turonian boundary event or the "Bonarelli Event". Stratigraphic definition The Turonian (French: ''Turonien'') was defined by the French paleontologist Alcide d'Orbigny (1802–1857) in 1842. Orbigny named it after the French city of Tours in the region of Touraine (department Indre-et-Loire), which is the original type locality. The base of the Turonian Stage is defined as the place where the ammonite species '' Watinoceras devonense'' first appears in the stratigraphic column. The official reference profile (the GSSP) for the base of the Turonian is located in the Roc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ricaurte, Cundinamarca
Ricaurte is a municipality and town of Colombia Colombia (, ; ), officially the Republic of Colombia, is a country in South America with insular regions in North America—near Nicaragua's Caribbean coast—as well as in the Pacific Ocean. The Colombian mainland is bordered by the Car ... in the department of Cundinamarca. A law issued on 14 November 1857 created the Peñalisa District and December of the same year the name was changed to Ricaurte; in 1937 it was annexed to the Girardot municipality but it recovered its condition of municipality in 1968. Other Facts * Market Day: Thursday and Sunday * Distance from Bogotá: 142 km * Foundation: 1813 like Peñalisa * Created: Departamental Decree No. 409 of 11 March 1968 * Median temperature: 27 °C * Demonym: * Dane Code: Veredas The Municipality of Ricaurte have 16 Veredas, 17 within the Urban Zone. The Veredas are: *Callejón, Casablanca, Cumaca, El Paso, El Portal, La Carrera, La Tetilla, La Virg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hoplitoides
''Hoplitoides'' is an ammonite from the Upper Cretaceous, Turonian belonging to the Coilopoceratidae, a family in the Acanthoceratoidea. ''Hoplitoides'' have early whorls which are grooved, then flat, and finally narrowly rounded venters; early stages with umbilical tubercles and space ribs, later stages becoming smooth. The suture is similar to that of ''Coilopoceras'' but less extreme. ''Hoplitoides'' has an established distribution which is widespread, from western North America, northwestern Africa and northern South America. Species * ''H. gibbulosus'' * ''H. ingens'' * ''H. koeneni'' * ''H. latesellatus'' (type species) * ''H. mirabilis'' * ''H. sandovalensis'' * ''H. wohltmanni'' Distribution Fossils of ''Hoplitoides'' have been found in Brazil, Cameroon, Colombia ( La Frontera, Huila, Cundinamarca and Boyacá, Loma Gorda, Aipe, Huila and San Rafael Formations),Patarroyo, 2016, p.41Patarroyo, 2011, p.69Patarroyo & Rojas, 2007, pp.92-93 Mexico, Nigeria, Peru, T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hauericeras
''Hauericeras'' is an ammonite genus from the Late Cretaceous that lived from the Coniacian to the late Maastrichtian, from about 90 to 66 mya. Fossils have been found in Europe, Russia, South Africa, Australia, India, Iraq, and in the United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie .... The shell of ''Haericeras'' is subinvolute with the outer whorl covering much of the inner, but leaving part of the inner whorls exposed. Whorls are smooth with narrow periodic constructions. Whorl section is laterally compressed, flanks gently bowed, venter sharp. The suture is strongly ammonitic. The genus '' Oiophyllites'' may be related. Species * ''Hauericeras gardeni'' * ''Hauericeras pseudogardeni'' * ''Hauericeras sulcatum'' References *W. Arkell ''et al.'', 1957. Mesozoi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fagesia
''Fagesia'' is a small, subglobular ammonite (suborder Ammonitina) belonging to the vascoceratid family of the Acanthocerataceae that lived during the Turonian stage of the Late Cretaceous, 92-88 Ma ago. The shell of ''Fagesia'' is about 9.5 cm (3.47 in) in diameter, typically with blunt umbilical tubercles from which spring 2 or three ribs each, but which are lost in the late growth stage. The suture is ammonitic with long spikey lobes and saddles with rounded subelements. Species * †''Fagesia catinus'' Mantell 1822 - Loma Gorda Formation, Colombia * †''Fagesia fleuryi'' Pervinquière 1907 * †''Fagesia peroni'' Pervinquière 1907 * †''Fagesia pervinquieri'' Bose 1920 * †''Fagesia rudra'' Stoliczka 1865 * †''Fagesia spheroidalis'' Pervinquière 1907 * †''Fagesia superstes'' Kossmat 1897 * †''Fagesia tevesthensis'' Peron 1896 Distribution Fossils of ''Fagesia'' have been found in Brazil, Colombia (El Colegio, Cundinamarca, La Frontera ( Cund ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Codazziceras
''Codazziceras'' is an early Late Cretaceous ammonite from the Late Cretaceous of Colombia, distinguished from '' Lyelliceras'' (Lyelliceratidae) from which it is based and added to the Euomphaloceratinae (Acanthoceratidae). The type species is ''Codazziceras scheibei'' and another described species is ''C. ospinae''.''Codazziceras'' at .org of ''Codazziceras'' have been found in the of Huila, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barroisiceras
''Barroisiceras'' is an acanthoceratacean ammonite from the Upper Cretaceous, Coniacian, included in the family Collignoniceratidae. Diagnosis The shell of ''Barroisiceras'' is rather involute, coiled such that the outer whorl embraces much of the previous, and is generally compressed. Whorls are high with a strong crenulate keel and sparse umbilical tubercles that develop into pairs of commonly flat ribs. Taxonomy ''Barroisiceras'' is divided two subgenera, ''Barroisiceras (Barroisiceras)'' and ''Barroisiceras (Texasia)'',with '' Alstadenites'' sometimes added as a third, ''Barroisiceras (Alstadenites)''. ''B. (Barroiciceras)'' is moderately involute and the suture is rather simple. ''B. (Texasia)'' is more evolute and has a distinctly eccentric umbilicus and more complex suture. Distribution Cretaceous of Austria, Czechoslovakia, France, Hungary, Italy, Japan, Morocco, Slovakia, Spain, Trinidad and Tobago and USSR References ;Notes ;Bibliography * Arkell ''et al.'', 1957. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ankinatsytes
''Ankinatsytes'' is an extinct genus of cephalopod belonging to the Ammonite subclass. The ammonite is from the Late Cretaceous of Colombia (Loma Gorda Formation) and Venezuela (La Luna Formation).''Ankinasytes'' at .orgPatarroyo, 2011 Species The following species have been described:''Ankinatsytes''at |
Calcareous
Calcareous () is an adjective meaning "mostly or partly composed of calcium carbonate", in other words, containing lime or being chalky. The term is used in a wide variety of scientific disciplines. In zoology ''Calcareous'' is used as an adjectival term applied to anatomical structures which are made primarily of calcium carbonate, in animals such as gastropods, i.e., snails, specifically about such structures as the operculum, the clausilium, and the love dart. The term also applies to the calcium carbonate tests of often more or less microscopic Foraminifera. Not all tests are calcareous; diatoms and radiolaria have siliceous tests. The molluscs are calcareous, as are calcareous sponges ( Porifera), that have spicules which are made of calcium carbonate. In botany ''Calcareous grassland'' is a form of grassland characteristic of soils containing much calcium carbonate from underlying chalk or limestone rock. In medicine The term is used in pathology, for example i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Late Cretaceous
The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', the Latin word for the white limestone known as chalk. The chalk of northern France and the white cliffs of south-eastern England date from the Cretaceous Period. Climate During the Late Cretaceous, the climate was warmer than present, although throughout the period a cooling trend is evident. The tropics became restricted to equatorial regions and northern latitudes experienced markedly more seasonal climatic conditions. Geography Due to plate tectonics, the Americas were gradually moving westward, causing the Atlantic Ocean to expand. The Western Interior Seaway divided North America into eastern and western halves; Appalachia and Laramidia. India maintained a northward course towards Asia. In the Southern Hemisphere, Australia and Ant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siltstone
Siltstone, also known as aleurolite, is a clastic sedimentary rock that is composed mostly of silt. It is a form of mudrock with a low clay mineral content, which can be distinguished from shale by its lack of fissility.Blatt ''et al.'' 1980, pp.381-382 Although its permeability and porosity is relatively low, siltstone is sometimes a tight gas reservoir rock, an unconventional reservoir for natural gas that requires hydraulic fracturing for economic gas production. Siltstone was prized in ancient Egypt for manufacturing statuary and cosmetic palettes. The siltstone quarried at Wadi Hammamat was a hard, fine-grained siltstone that resisted flaking and was almost ideal for such uses. Description There is not complete agreement on the definition of siltstone. One definition is that siltstone is mudrock ( clastic sedimentary rock containing at least 50% clay and silt) in which at least 2/3 of the clay and silt fraction is composed of silt-sized particles. Silt is defined a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
