|
Bobasatrania
''Bobasatrania'' is an extinct genus of prehistoric marine Actinopterygii, ray-finned fish that survived the Permian-Triassic extinction event. Fossils of ''Bobasatrania'' were found in beds of Changhsingian (Lopingian, late Permian) to Ladinian (Middle Triassic) age. It was most speciose during the Early Triassic. The genus was named after the locality Bobasatrana (near Ambilobe) in northeast Madagascar, from where the type species, ''Bobasatrania mahavavica'', was described. The name of this species refers to the Mahavavy River. Taxonomy The following species are known: * †''B. antiqua'' (Accordi, 1955) - Latest Permian of Italy * †''B. canadensis'' (Lawrence Lambe, Lambe, 1914) - Early Triassic (Olenekian) of British Columbia * †''B. ceresiensis'' Bürgin, 1992 - Middle Triassic (Ladinian) of Switzerland * †''B. groenlandica'' Erik Stensiö, Stensiö, 1932 - Earliest Triassic of Greenland * †''B. ladina'' (Accordi, 1955) - Latest Permian or earliest Triassic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bobasatrania Canadensis AMNH 6210
''Bobasatrania'' is an extinct genus of prehistoric marine ray-finned fish that survived the Permian-Triassic extinction event. Fossils of ''Bobasatrania'' were found in beds of Changhsingian (late Permian) to Ladinian (Middle Triassic) age. It was most speciose during the Early Triassic. The genus was named after the locality Bobasatrana (near Ambilobe) in northeast Madagascar, from where the type species, ''Bobasatrania mahavavica'', was described. The name of this species refers to the Mahavavy River. Taxonomy The following species are known: * †''B. antiqua'' (Accordi, 1955) - Latest Permian of Italy * †''B. canadensis'' ( Lambe, 1914) - Early Triassic (Olenekian) of British Columbia * †''B. ceresiensis'' Bürgin, 1992 - Middle Triassic (Ladinian) of Switzerland * †''B. groenlandica'' Stensiö, 1932 - Earliest Triassic of Greenland * †''B. ladina'' (Accordi, 1955) - Latest Permian or earliest Triassic of Italy * †''B. mahavica'' White, 1932 - Early Tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Actinopterygii
Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class (biology), class of Osteichthyes, bony fish that comprise over 50% of living vertebrate species. They are so called because of their lightly built fish fin, fins made of webbings of skin supported by radially extended thin bony spine (zoology), spines called ''lepidotrichia'', as opposed to the bulkier, fleshy lobed fins of the sister taxon, sister clade Sarcopterygii (lobe-finned fish). Resembling folding fans, the actinopterygian fins can easily change shape and wetted area, providing superior thrust-to-weight ratios per movement compared to sarcopterygian and chondrichthyian fins. The fin rays attach directly to the proximal or basal skeletal elements, the radials, which represent the articulation (anatomy), articulation between these fins and the internal skeleton (e.g., pelvic and pectoral girdles). The vast majority of actinopterygians are teleosts. By species count, they domi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Triassic
The Early Triassic is the first of three epochs of the Triassic Period of the geologic timescale. It spans the time between 251.9 Ma and Ma (million years ago). Rocks from this epoch are collectively known as the Lower Triassic Series, which is a unit in chronostratigraphy. The Early Triassic is the oldest epoch of the Mesozoic Era. It is preceded by the Lopingian Epoch (late Permian, Paleozoic Era) and followed by the Middle Triassic Epoch. The Early Triassic is divided into the Induan and Olenekian ages. The Induan is subdivided into the Griesbachian and Dienerian subages and the Olenekian is subdivided into the Smithian and Spathian subages. The Lower Triassic series is coeval with the Scythian Stage, which is today not included in the official timescales but can be found in older literature. In Europe, most of the Lower Triassic is composed of Buntsandstein, a lithostratigraphic unit of continental red beds. The Early Triassic and partly also the Middle Trias ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jean-Pierre Lehman
Jean-Pierre Lehman (10 August 1914 – 26 February 1981) was a French paleontologist who specialized on tetrapods and actinopterygians. He followed early ideas comparative anatomy to study evolution through cladistic ideas and making use of biogeographical affinities. Lehman was born in Caen to Madeleine Auvray and civil engineer Gaston Lehman. Educated at Lycée Carnot, and the Sorbonne he also went to Grenoble where he met and married Ingegärd Eneström, daughter of Swedish physician Erik Hjalmar Eneström. Visits to Sweden brought him into contact with Erik Stensiö at the Museum of Natural History of Stockholm where he worked on the vertebrates of the Upper Devonian of Scania in 1936–37. His thesis on the scales of thelodonts and acanthodians was criticized and led to a restudy of the material by J.M.J. Vergoossen. He worked as a high school teacher in Nice from 1940 to 1945 and made visits to Stockholm between 1945 and 1949. In 1950 he moved to the geology laborato ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Olenekian
In the geologic timescale, the Olenekian is an age (geology), age in the Early Triassic epoch (geology), epoch; in chronostratigraphy, it is a stage (stratigraphy), stage in the Lower Triassic series (stratigraphy), series. It spans the time between annum, Ma and Ma (million years ago). The Olenekian is sometimes divided into the Smithian and the Spathian subages or substages. The Olenekian follows the Induan and is followed by the Anisian (Middle Triassic). The Olenekian saw the deposition of a large part of the Buntsandstein in Europe. The Olenekian is roughly coeval with the regional Yongningzhenian Stage used in China. Stratigraphic definitions The Olenekian Stage was introduced into scientific literature by Russian stratigraphers in 1956. The stage is named after Olenëk in Siberia. Before the subdivision in Olenekian and Induan became established, both stages formed the Scythian Stage, which has since disappeared from the official timescale. The base of the Olenekian is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Changhsingian
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 fossi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pakistan
Pakistan, officially the Islamic Republic of Pakistan, is a country in South Asia. It is the List of countries and dependencies by population, fifth-most populous country, with a population of over 241.5 million, having the Islam by country#Countries, second-largest Muslim population as of 2023. Islamabad is the nation's capital, while Karachi is List of cities in Pakistan by population, its largest city and financial centre. Pakistan is the List of countries and dependencies by area, 33rd-largest country by area. Bounded by the Arabian Sea on the south, the Gulf of Oman on the southwest, and the Sir Creek on the southeast, it shares land borders with India to the east; Afghanistan to the west; Iran to the southwest; and China to the northeast. It shares a maritime border with Oman in the Gulf of Oman, and is separated from Tajikistan in the northwest by Afghanistan's narrow Wakhan Corridor. Pakistan is the site of History of Pakistan, several ancient cultures, including the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salt Range
The Salt Range ( and Namkistan نمکستان) is a mountain range in the north of Punjab province of Pakistan, deriving its name from its extensive deposits of rock salt. The range extends along the south of the Potohar Plateau and the north of the Jhelum River. The Salt Range contains the great mines of Khewra, Kalabagh and Warcha which yield vast supplies of salt. Coal Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other Chemical element, elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal i ... of a medium quality is also found here. The Salt Range starts from the Bakralla and Tilla Jogian ridges in the east and extends to the west of River Jhelum. In the Himalayan and Salt Range, rock containing fossil of marine life go back to the Ediacaran period (up to 570 million years ago), which shows these rocks have developed out of sea sediments, and t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Svalbard
Svalbard ( , ), previously known as Spitsbergen or Spitzbergen, is a Norway, Norwegian archipelago that lies at the convergence of the Arctic Ocean with the Atlantic Ocean. North of continental Europe, mainland Europe, it lies about midway between the northern coast of Norway and the North Pole. The islands of the group range from 74th parallel north, 74° to 81st parallel north, 81° north latitude, and from 10th meridian east, 10° to 35th meridian east, 35° east longitude. The largest island is Spitsbergen (37,673 km2), followed in size by Nordaustlandet (14,443 km2), (5,073 km2), and Barentsøya (1,288 km2). Bear Island (Norway), Bjørnøya or Bear Island (178 km2) is the most southerly island in the territory, situated some 147 km south of Spitsbergen. Other small islands in the group include Hopen (Svalbard), Hopen to the southeast of Edgeøya, Kongsøya and Svenskøya in the east, and Kvitøya to the northeast. The largest settlement is Longyearbyen, situated in Isfjor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nevada
Nevada ( ; ) is a landlocked state in the Western United States. It borders Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. Nevada is the seventh-most extensive, the 32nd-most populous, and the ninth-least densely populated U.S. state. Nearly three-quarters of Nevada's population live in Clark County, which contains the Las Vegas–Paradise metropolitan area, including three of the state's four largest incorporated cities. Nevada's capital is Carson City. Las Vegas is the largest city in the state. Nevada is officially known as the "Silver State" because of the importance of silver to its history and economy. It is also known as the "Battle Born State" because it achieved statehood during the Civil War (the words "Battle Born" also appear on its state flag); due to the presidency of Abraham Lincoln, the Union benefited immensely from the support of newly awarded statehood by the infusion of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
