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Siamaná Formation
The Siamaná Formation (, E3s) is a list of fossiliferous stratigraphic units of Colombia, fossiliferous formation (geology), geological formation of the Cocinetas Basin in the northernmost departments of Colombia, department of La Guajira Department, La Guajira. The formation consists of conglomerate (geology), conglomerates and limestones. The Siamaná Formation dates to the Paleogene period; Oligocene, Middle to Late Oligocene epoch, corresponding to the Deseadan in the South American land mammal age, SALMA classification. Etymology The formation was defined by Renz in 1960 and named after the village of Siamaná.Moreno et al., 2015, p.7 Description Lithologies The Siamaná Formation consists of Conglomerate (geology), conglomerates and thick carbonates.Hendy et al., 2015, p.47 Stratigraphy and depositional environment The Siamaná Formation, with a maximum thickness of , overlies the Macarao Formation and is overlain by the Uitpa Formation. The age has been estimated t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oligocene
The Oligocene ( ) is a geologic epoch (geology), epoch of the Paleogene Geologic time scale, Period that extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that define the epoch are well identified but the exact dates of the start and end of the epoch are slightly uncertain. The name Oligocene was coined in 1854 by the German paleontologist Heinrich Ernst Beyrich from his studies of marine beds in Belgium and Germany. The name comes from Ancient Greek (''olígos'') 'few' and (''kainós'') 'new', and refers to the sparsity of Neontology, extant forms of Mollusca, molluscs. The Oligocene is preceded by the Eocene Epoch and is followed by the Miocene Epoch. The Oligocene is the third and final epoch of the Paleogene Period. The Oligocene is often considered an important time of transition, a link between the archaic world of the tropical Eocene and the more modern ecosystems of the Miocene. Major chang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleogene
The Paleogene Period ( ; also spelled Palaeogene or Palæogene) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period Ma (million years ago) to the beginning of the Neogene Period Ma. It is the first period of the Cenozoic Era, the tenth period of the Phanerozoic and is divided into the Paleocene, Eocene, and Oligocene epochs. The earlier term Tertiary Period was used to define the time now covered by the Paleogene Period and subsequent Neogene Period; despite no longer being recognized as a formal stratigraphic term, "Tertiary" still sometimes remains in informal use. Paleogene is often abbreviated "Pg", although the United States Geological Survey uses the abbreviation "" for the Paleogene on the Survey's geologic maps. Much of the world's modern vertebrate diversity originated in a rapid surge of diversification in the early Paleogene, as survivors of the Cretaceous–Paleogene extinction event took advantage of empty ecolo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honda Group, Colombia
The Honda Group (, Tsh, Ngh) is a group (geology), geological group of the Upper Magdalena Basin, Upper and Middle Magdalena Basins and the adjacent Cordillera Central (Colombia), Central and Cordillera Oriental (Colombia), Eastern Ranges of the Colombian Andes. The group, in older literature also defined as formation, is in its present-day type section in the Tatacoa Desert in the departments of Colombia, department of Huila Department, Huila subdivided into two main formations; La Victoria and Villavieja. The group was originally defined in and named after Honda, Tolima, Honda, Tolima, but has been redefined based on the many fossil finds in the Tatacoa Desert, to the south. In the original type section of its occurrence, the thick group is subdivided into three formations, from old to young; Cambrás, San Antonio and Los Limones. The group dates to the Neogene period; in its broadest definition from the Oligocene, Late Oligocene to Miocene, Late Miocene, and in the redefine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cesar-Ranchería Basin
The Cesar-Ranchería Basin () is a sedimentary basin in northeastern Colombia. It is located in the southern part of the departments of Colombia, department of La Guajira Department, La Guajira and northeastern portion of Cesar Department, Cesar. The basin is bound by the Oca-Ancón Fault System, Oca Fault in the northeast and the Bucaramanga-Santa Marta Fault in the west. The mountain ranges Sierra Nevada de Santa Marta and the Serranía del Perijá enclose the narrow triangular intermontane basin, that covers an area of . The Cesar River, Cesar and Ranchería Rivers flow through the basin, bearing their names. The basin is of importance for hosting the worldwide tenth biggest and largest coal mine of Latin America, Cerrejón. The coals are mined from the Paleocene Cerrejón Formation, that also has provided several important List of fossiliferous stratigraphic units in Colombia, paleontological finds, among others ''Titanoboa, Titanoboa cerrejonensis'', with an estimated length ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eastern Hills, Bogotá
Eastern or Easterns may refer to: Transportation Airlines *China Eastern Airlines, a current Chinese airline based in Shanghai * Eastern Air, former name of Zambia Skyways *Eastern Air Lines, a defunct American airline that operated from 1926 to 1991 * Eastern Air Lines (2015), an American airline that began operations in 2015 *Eastern Airlines, LLC, previously Dynamic International Airways, a U.S. airline founded in 2010 * Eastern Airways, an English/British regional airline *Eastern Provincial Airways, a defunct Canadian airline that operated from 1949 to 1986 Roads * Eastern Avenue (other), various roads *Eastern Parkway (other), various parkways * Eastern Freeway, Melbourne, Australia * Eastern Freeway Mumbai, Mumbai, India Other *Eastern Railway (other), various railroads *, a cargo liner in service 1946-65 Education * Eastern University (other) *Eastern College (other) Sports * Easterns (cricket team), South Afric ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ostrea
''Ostrea'' is a genus of edible oysters, marine bivalve mollusks in the family Ostreidae, the oysters. Fossil records Although molecular studies suggest that ''Ostrea'' first appeared around the Eocene and originated no earlier than the Cretaceous, paleontologists have historically applied the genus to almost all fossil oysters from the Permian onward, many of which are only superficially similar to extant ''Ostrea''. As a result, the genus ''Ostrea'' includes about 150 extinct species. History At least one species within this genus, '' Ostrea lurida'', has been recovered in archaeological excavations along the Central California coast of the Pacific Ocean, demonstrating it was a marine taxon exploited by the Native American Chumash people as a food source. Species Species in the genus ''Ostrea'' include: * † '' Ostrea albertensis'' Russell & Landes, 1937 * '' Ostrea algoensis'' G. B. Sowerby II, 1871 *'' Ostrea angasi'' G.B. Sowerby II, 1871 * '' Ostrea angelica'' R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mimachlamys
''Mimachlamys'' is a genus of scallops, marine bivalve molluscs in the taxonomic family Pectinidae. There are at least 11 living species, including the glory scallop '' Mimachlamys gloriosa'', and the '' Mimachlamys asperrima''. Shell description In this genus, the valves are both convex Convex or convexity may refer to: Science and technology * Convex lens, in optics Mathematics * Convex set, containing the whole line segment that joins points ** Convex polygon, a polygon which encloses a convex set of points ** Convex polytop ..., though the left valve is more convex than the right. The auricles, ear-like projections on either side of the hinge, are inequal in size, with the anterior always being much larger than the posterior. The byssal notch is deep, and the valves are generally similar in sculpture. Distribution and habitat The habitat for this genus is temperate oceans down to a depth of several hundred meters, from southern Australia to Indonesia and north to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guajira Basin
Guajira may refer to: * Guajira Peninsula, a peninsula in the northernmost part of South America shared by Colombia and Venezuela * Guajiro people (Wayuu), a South American ethnic group inhabiting northeastern Colombia and northwestern Venezuela * guajiro bean (also known as the kapeshuna bean), a set of heirloom cultivars of the cowpea grown mainly in northeastern Colombia * La Guajira Department, a department of Colombia which includes most of the Guajira Peninsula * La Guajira Desert, a desert which covers most of the Guajira Peninsula * Guajira (music) Guajira is a music genre derived from the punto cubano. According to some specialists, the punto cubano was known in Spain since the 18th century, where it was called "punto de La Habana", and by the second half of the 19th century it was adop ..., a style of Cuban music, song or dance * ''Guajira'' (TV series), a Colombian telenovela * Guajira (slang), is also another way to denote a woman who works and lives in a rural ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seal Rock
A petroleum reservoir or oil and gas reservoir is a subsurface accumulation of hydrocarbons contained in porous or fractured rock formations. Such reservoirs form when kerogen (ancient plant matter) is created in surrounding rock by the presence of high heat and pressure in the Earth's crust. Reservoirs are broadly classified as ''conventional'' and '' unconventional'' reservoirs. In conventional reservoirs, the naturally occurring hydrocarbons, such as crude oil (petroleum) or natural gas, are trapped by overlying rock formations with lower permeability, while in unconventional reservoirs the rocks have high porosity and low permeability, which keeps the hydrocarbons trapped in place, therefore not requiring a cap rock. Reservoirs are found using hydrocarbon exploration methods. Oil field An oil field is an area of accumulated liquid petroleum underground in multiple (potentially linked) reservoirs, trapped as it rises to impermeable rock formations. In industrial term ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shallow Marine
Shallow water marine environment refers to the neritic marine environment between the shore and the shelf break. This environment is characterized by oceanic, geological and biological conditions, as described below, and water in this environment is shallow and clear, allowing the formation of different sedimentary structures, carbonate rocks, coral reefs, and allowing certain organisms to survive and become fossils. Sediment The sediment itself is often composed of limestone, which forms readily in shallow, warm, calm waters. While siliciclastic and carbonaceous sediments can coexist, shallow marine environments can also contain only one or the other. Shallow water marine sediment primarily features larger grain sizes because smaller grains have washed out to deeper water. Within carbonaceous sedimentary rock, evaporite minerals such as gypsum, anhydrite, and halite may be present. The most common evaporite minerals found within modern and ancient deposits are gypsum, anhydrit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Depositional Environment
In geology, depositional environment or sedimentary environment describes the combination of physical, chemical, and biological processes associated with the deposition of a particular type of sediment and, therefore, the rock types that will be formed after lithification, if the sediment is preserved in the rock record. In most cases, the environments associated with particular rock types or associations of rock types can be matched to existing analogues. However, the further back in geological time sediments were deposited, the more likely that direct modern analogues are not available (e.g. banded iron formations). Types of depositional environments Continental * – type of Fluvial deposit. Caused by moving water in a fan shape (Alluvial Fan) and containing mostly impermeable and nonporous sediments well sorted. * . Often in deserts and coastal regions and well sorted, large scale cross-beds * – processes due to moving water, mainly streams. Common sediments are g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
