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Changhsingian Life
In the geologic time scale, the Changhsingian or Changxingian is the latest age or uppermost stage of the Permian. It is also the upper or latest of two subdivisions of the Lopingian Epoch or Series. The Changhsingian lasted from to 251.9 Ma ago. It is preceded by the Wuchiapingian age/stage and is followed by the Induan age/stage (Early Triassic epoch). The greatest mass extinction in the Phanerozoic eon, the Permian–Triassic extinction event, occurred around the end of this age. Stratigraphic definitions The Changhsingian is named after Changxing () in northern Zhejiang, China. The stage was named for the Changhsing Limestone. The name was first used for a stage in 1970 and was anchored in the international timescale in 1981.. The base of the Changhsingian Stage is at the first appearance of the conodont species '' Clarkina wangi''. The global reference profile is profile D at Meishan, in the type area in Changxing, just below the Changhsingian foraminifer index fossil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bellerophon Formation
Bellerophon or Bellerophontes (; ; lit. "slayer of Belleros") or Hipponous (; lit. "horse-knower"), was a divine Corinthian hero of Greek mythology, the son of Poseidon and Eurynome, and the foster son of Glaukos. He was "the greatest hero and slayer of monsters, alongside Cadmus and Perseus, before the days of Heracles". Among his greatest feats was killing the Chimera of the ''Iliad'', a monster that Homer depicted with a lion's head, a goat's body, and a serpent's tail: "her breath came out in terrible blasts of burning flame." Bellerophon was also known for capturing and taming the winged horse Pegasus with the help of Athena's charmed bridle, and earning the disfavour of the gods after attempting to ride Pegasus to Mount Olympus. Etymology One possible etymology that has been suggested is: Βελλεροφόντης (Bellerophóntēs) from Ancient Greek βέλεμνον (bélemnon), βελόνη (belóne) or βέλος (bélos, "projectile, dart, javelin, needle, arr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Induan
The Induan is the first age of the Early Triassic epoch in the geologic timescale, or the lowest stage of the Lower Triassic series in chronostratigraphy. It spans the time between 251.9 Ma and 249.9 Ma (million years ago). The Induan is sometimes divided into the Griesbachian and the Dienerian subages or substages. The Induan is preceded by the Changhsingian (latest Permian) and is followed by the Olenekian. The Induan is roughly coeval with the regional Feixianguanian Stage of China. Geology Stratigraphy The Triassic is the first period of the Mesozoic era. It is subdivided into the Lower, Middle, and Upper Triassic series, which are further subdivided into stages. The Induan is the first stage of the Lower Triassic, from 251.9 million to 249.9 million years ago, spanning the first 2 million years after the Permian–Triassic extinction event. Stages can be defined globally or regionally. For global stratigraphic correlation, the International Commission on Str ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonoid
Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family Nautilidae). The earliest ammonoids appeared during the Emsian stage of the Early Devonian (410.62 million years ago), with the last species vanishing during or soon after the Cretaceous–Paleogene extinction event (66 million years ago). They are often called ammonites, which is most frequently used for members of the order Ammonitida, the only remaining group of ammonoids from the Jurassic up until their extinction. Ammonoids exhibited considerable diversity over their evolutionary history, with over 10,000 species having been described. Ammonoids are excellent index fossils, and they have been frequently used to link rock layers in which a particular species or genus is found to specific geologic time periods. Their fossil shells usua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Foraminifer
Foraminifera ( ; Latin for "hole bearers"; informally called "forams") are single-celled organisms, members of a phylum or class of Rhizarian protists characterized by streaming granular ectoplasm for catching food and other uses; and commonly an external shell (called a "test") of diverse forms and materials. Tests of chitin (found in some simple genera, and ''Textularia'' in particular) are believed to be the most primitive type. Most foraminifera are marine, the majority of which live on or within the seafloor sediment (i.e., are benthic, with different sized species playing a role within the macrobenthos, meiobenthos, and microbenthos), while a smaller number float in the water column at various depths (i.e., are planktonic), which belong to the suborder Globigerinina. Fewer are known from freshwater or brackish conditions, and some very few (nonaquatic) soil species have been identified through molecular analysis of small subunit ribosomal DNA. Foraminifera typically produ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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] |
Canadian Society Of Petroleum Geologists
The Canadian Energy Geoscience Association (CEGA) is a professional geoscience society in Canada. CEGA works to advance the science of geology, foster professional development of members and promote community awareness of the profession. The organization was founded on December 17, 1927, as the ''Alberta Society of Petroleum Geologists'' in Calgary and was modelled after the American Association of Petroleum Geologists. It is based in Calgary, Alberta. History The society was founded in 1927 in Calgary, and was affiliated to the American Association of Petroleum Geologists in 1930. In the 1950s, the Saskatchewan Geological Society and the Edmonton Geological Society were affiliated to the ASPG. The organization was renamed to ''Canadian Petroleum Geology Society'' in 1969, when it merged with the Saskatchewan Geological Society and the Edmonton Geological Society. In 2022 the society was renamed to the Canadian Energy Geoscience Association. Publications The society published a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Survey Of China
The China Geological Survey (CGS) () is a government-owned, China, Chinese organization researching China's mineral resources under the State Council of the People's Republic of China. According to the national land and resources survey plan, it is now managed by the Ministry of Natural Resources. It is the largest Geoscience agency in China since being reinstated in 1999, and the headquarter is in Beijing, the capital of China. The CGS is the primary organization responsible for conducting geological surveys and research in China, and its work is focused on resource exploration, environmental protection, geological hazard prevention, and geological disaster reduction. The CGS conducts geological surveys across China's land, sea, and polar regions, with a particular focus on the exploration and development of mineral resources. It also conducts research on geology, mineral resources, and geological hazards. The CGS is responsible for publishing geological maps, reports, and other ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Changxing County
() is a county of the prefecture-level city of Huzhou, in the northwest of Zhejiang province, China. Situated on the southwest shore of Lake Tai, it borders the provinces of Jiangsu to the north and Anhui to the west. It has a total area of and a population of 620,000 inhabitants. Changxing, established in the third year of Taikang's reign (emperor Wu of Jin) (282 AD) during the Jin Dynasty, has an extensive history of over 1,700 years. It has rich resources, a long cultural heritage, and cherishes its fame as “the realm of fish and rice”, “the home of silk”, “the land of culture”, and “the distinguished county in the southeast China”. The Changhsingian Age of the Permian Period of geological time is named after Changxing. The stage was named for the Changhsing Limestone. Since 2004, Changxing has had a Twin City (County) relationship with Kalmar County in Sweden. Administrative divisions Towns: * Zhicheng, Changxing (雉城镇), Hongqiao, Changxing (洪 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Permian–Triassic Extinction Event
The Permian–Triassic extinction event (also known as the P–T extinction event, the Late Permian extinction event, the Latest Permian extinction event, the End-Permian extinction event, and colloquially as the Great Dying,) was an extinction event that occurred approximately 251.9 Million years ago, million years ago (mya), at the boundary between the Permian and Triassic geologic periods, and with them the Paleozoic and Mesozoic eras. It is Earth's most severe known extinction event, with the extinction of 57% of Family (biology), biological families, 62% of genera and 81% of marine biology, marine species, (previous estimates of 90–96% marine species extinction were due to historical conflation with the End-Capitanian mass extinction event, end-Capitanian mass extinction which occurred 7–10 million years earlier) and 70% of terrestrial vertebrate species. It is also the greatest known mass extinction of insects. It is the greatest of the "Big Five" mass extinctions of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eon (geology)
The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochronology (a scientific branch of geology that aims to determine the age of rocks). It is used primarily by Earth scientists (including geologists, paleontologists, geophysicists, geochemists, and paleoclimatologists) to describe the timing and relationships of events in geologic history. The time scale has been developed through the study of rock layers and the observation of their relationships and identifying features such as lithologies, paleomagnetic properties, and fossils. The definition of standardised international units of geological time is the responsibility of the International Commission on Stratigraphy (ICS), a constituent body of the International Union of Geological Sciences (IUGS), whose primary objective is to precisely de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
