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Geoncheonri Formation
The Geoncheonri Formation () is an Early Cretaceous (Aptian-Albian) geologic Formation (geology), formation of the Hayang Group in the Gyeongsang Basin of southeast South Korea.Geoncheonri Formation in the Paleobiology Database Fossil ornithopod tracks,Weishampel et al., 2004, pp.517-607 as well as fossils of ''Kirgizemys'' have been reported from the lacustrine siltstones and mudstones of the formation. Description The Geoncheonri Formation (ca. thick) is the uppermost formation of the Hayang Group, belonging to the Gyeongsang Supergroup. The Gyeongsang Supergroup is widely distributed in the southeastern part of the Korean Peninsula, mainly within the Gyeongsang Basin, whi ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Formation
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 (geology), 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ornithopod
Ornithopoda () is a clade of ornithischian dinosaurs, called ornithopods (), that started out as small, bipedal running grazers and grew in size and numbers until they became one of the most successful groups of herbivores in the Cretaceous world, dominating the North American land. Their major evolutionary advantage was the progressive development of a chewing apparatus that became the most sophisticated ever developed by a non-avian dinosaur, rivaling that of modern mammals such as the domestic cow. They reached their apex of diversity and ecological dominance in the hadrosaurids (colloquially known as 'duck-bills'), before they were wiped out by the Cretaceous–Paleogene extinction event along with all other non- avian dinosaurs. Members are known from all seven continents, though they are generally rare in the Southern Hemisphere. History of research In 1870, Thomas Henry Huxley listed Iguanodontidae (coined by Cope a year earlier) as one of his three families of dinosa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haman Formation
The Haman Formation () is an Early Cretaceous geological formation in South Korea. It has been dated to the Albian, with an estimated maximum depositional age of 105.4 ± 0.4 Ma. The deposit is known for its tracks, including those of dinosaurs, pterosaurs and birds. It overlies the Silla Conglomerate which overlies the Chilgok Formation. It is laterally equivalent to the Sagog Formation. Vertebrate paleofauna Fossil pterosaur, theropod, sauropod and ornithopod tracks have been recovered from this formation. Some dinosaur tracks show signs of display behavior. Dinosaur skin impressions have also been found in this formation. Ichnofossils See also * * List of fossil sites * Geoncheonri Formation * Gugyedong Formation * Hasandong Formation * Jinju Formation The Jinju Formation () is an Early Cretaceous geologic formation in South Korea. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silla Conglomerate
Silla or Shilla (57 BCE – 935 CE) ( , Old Korean: Syera, Old Japanese: Siraki2) was a Korean kingdom located on the southern and central parts of the Korean Peninsula. Silla, along with Baekje and Goguryeo, formed the Three Kingdoms of Korea. Founded by Hyeokgeose of Silla, of the Park family, the Korean dynasty was ruled by the Gyeongju Gim (Kim) (김, 金) clan for 586 years, the Miryang Bak (Park) (박, 朴) clan for 232 years and the Wolseong Seok (석, 昔) clan for 172 years. It began as a chiefdom in the Samhan confederacies, once allied with Sui China and then Tang China, until it eventually conquered the other two kingdoms, Baekje in 660 and Goguryeo in 668. Thereafter, Unified Silla occupied most of the Korean Peninsula, while the northern part re-emerged as Balhae, a successor-state of Goguryeo. After nearly 1,000 years of rule, Silla fragmented into the brief Later Three Kingdoms of Silla, Later Baekje, and Taebong, handing over power to Goryeo in 935. Ety ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chilgog Formation
The Chilgog Formation (), also known as the Chilgok Formation, is an Early Cretaceous geologic formation in South Korea.Chilgog Formation in the Formerly dated to the to , later dating has established an Albian age.Lee et al., 2018 |
Fluvial
In geography and geology, fluvial processes are associated with rivers and streams and the deposits and landforms created by them. When the stream or rivers are associated with glaciers, ice sheets, or ice caps, the term glaciofluvial or fluvioglacial is used. Fluvial processes Fluvial processes include the motion of sediment and erosion or deposition on the river bed. The movement of water across the stream bed exerts a shear stress directly onto the bed. If the cohesive strength of the substrate is lower than the shear exerted, or the bed is composed of loose sediment which can be mobilized by such stresses, then the bed will be lowered purely by clearwater flow. In addition, if the river carries significant quantities of sediment, this material can act as tools to enhance wear of the bed ( abrasion). At the same time the fragments themselves are ground down, becoming smaller and more rounded ( attrition). Sediment in rivers is transported as either bedload (the coar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alluvial
Alluvium (from Latin ''alluvius'', from ''alluere'' 'to wash against') is loose clay, silt, sand, or gravel that has been deposited by running water in a stream bed, on a floodplain, in an alluvial fan or beach, or in similar settings. Alluvium is also sometimes called alluvial deposit. Alluvium is typically geologically young and is not consolidated into solid rock. Sediments deposited underwater, in seas, estuaries, lakes, or ponds, are not described as alluvium. Floodplain alluvium can be highly fertile, and supported some of the earliest human civilizations. Definitions The present consensus is that "alluvium" refers to loose sediments of all types deposited by running water in floodplains or in alluvial fans or related landforms. However, the meaning of the term has varied considerably since it was first defined in the French dictionary of Antoine Furetière, posthumously published in 1690. Drawing upon concepts from Roman law, Furetière defined '' alluvion'' ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gyeongsang Supergroup
Gyeongsang ( ko, 경상도, ''Gyeongsang-do''; ) was one of the eight provinces of Korea during the Joseon dynasty. Gyeongsang was located in the southeast of Korea. The provincial capital was Daegu. The region was the birthplace of the Kingdom of Silla. The region also has a significant role in modern Korean history, since seven previous South Korean presidents (Park Chung-hee, Roh Tae-woo, Chun Doo-hwan, Kim Young-sam, Roh Moo-hyun, Park Geun-hye, and Moon Jae-in) were born in the Gyeongsang region. Today, the region is divided into 5 administrative divisions: the three independent cities of Busan, Daegu and Ulsan, and the two provinces of Gyeongsangbuk-do and Gyeongsangnam-do. The largest city in the region is Busan, followed by Daegu. Sub-regionally, the region is also divided into Gyeongbuk and Gyeongnam. Gyeongbuk consists of Daegu and Gyeongsangbuk-do, while Gyeongnam consists of Busan, Ulsan and Gyeongsangnam-do. History The predecessor to Gyeongsang Province ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mudstone
Mudstone, a type of mudrock, is a fine-grained sedimentary rock whose original constituents were clays or muds. Mudstone is distinguished from ''shale'' by its lack of fissility (parallel layering).Blatt, H., and R.J. Tracy, 1996, ''Petrology.'' New York, New York, W. H. Freeman, 2nd ed, 529 pp. The term ''mudstone'' is also used to describe carbonate rocks ( limestone or dolomite) that are composed predominantly of carbonate mud. However, in most contexts, the term refers to siliciclastic mudstone, composed mostly of silicate minerals. The NASA Curiosity rover has found deposits of mudstone on Mars that contain organic substances such as propane, benzene and toluene. Definition There is not a single definition of mudstone that has gained general acceptance,Boggs 2006, p.143 though there is wide agreement that mudstones are fine-grained sedimentary rocks, composed mostly of silicate grains with a grain size less than . Individual grains this size are too small to be distin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
