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Eigil Nielsen (paleontologist)
Eigil Hans Aage Nielsen (16 August 1910 – 8 December 1968) was a Danish paleontologist, who specialized in fossil vertebrate anatomy, particularly of Triassic bony fish. Life Eigil Nielsen was born in Copenhagen on 16 August 1910, to engineer Hans Peder Nielsen and his wife Ellen Nielsen (née Pedersen). He attended Sorø Akademi gymnasium. Already at young age, he collected fossils from different paleontological sites in Denmark. He later studied in Copenhagen, and received his Master's degree in 1935 and his doctorate degree in 1942. He studied especially fossil vertebrate faunas from Greenland, which were collected during multiple expeditions. In 1957, he became professor of paleontology in Copenhagen and curator at the Geological Museum in Copenhagen. He had been a member of the Royal Danish Academy of Sciences and Letters since 1965. He died in Gentofte on 8 December 1968 after a long illness. Research Nielsen is mostly known for his in-depth monographs on Triassic ray-fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monograph
A monograph is a specialist work of writing (in contrast to reference works) or exhibition on a single subject or an aspect of a subject, often by a single author or artist, and usually on a scholarly subject. In library cataloging, ''monograph'' has a broader meaning—that of a nonserial publication complete in one volume (book) or a definite number of volumes. Thus it differs from a serial or periodical publication such as a magazine, academic journal, or newspaper. In this context only, books such as novels are considered monographs.__FORCETOC__ Academia The English term "monograph" is derived from modern Latin "monographia", which has its root in Greek. In the English word, "mono-" means "single" and "-graph" means "something written". Unlike a textbook, which surveys the state of knowledge in a field, the main purpose of a monograph is to present primary research and original scholarship ascertaining reliable credibility to the required recipient. This research is prese ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devonian
The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, where rocks from this period were first studied. The first significant adaptive radiation of life on dry land occurred during the Devonian. Free-sporing vascular plants began to spread across dry land, forming extensive forests which covered the continents. By the middle of the Devonian, several groups of plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants appeared. The arthropod groups of myriapods, arachnids and hexapods also became well-established early in this period, after starting their expansion to land at least from the Ordovician period. Fish reached substantial diversity during this time, leading the Devonian to often be dubbed the Age of Fishes. The placoderms began dominating ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lauge Koch
Lauge Koch (5 July 1892 – 5 June 1964) was a Danish geologist and Arctic explorer. Biography Lauge Koch was born in 1892 to Karl and Elisabeth Koch. His development as a scientist was greatly influenced by his father's second cousin Johan Peter Koch - a polar explorer, a member of several Greenland expeditions, including Ludvig Mylius-Erichsen's and Alfred Wegener's (in the latter's expedition (1912-1913) to cross Greenland, he led a sledging party). He received his higher education at the University of Copenhagen, where he began his studies in 1911, in 1920 he received a master's degree, and in 1929 a doctor's degree, having defended a dissertation on the topic "Stratigraphy of Greenland". General He was the renowned leader of 24 Danish government expeditions to Greenland, and the central character in the ''Lauge Koch Controversy'', an international and intra-national conflict. Beginning in December 1935 a bitter conflict arose between Koch and eleven of the most prominent Da ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Popular Science
''Popular Science'' (also known as ''PopSci'') is an American digital magazine carrying popular science content, which refers to articles for the general reader on science and technology subjects. ''Popular Science'' has won over 58 awards, including the American Society of Magazine Editors awards for its journalistic excellence in 2003 (for General Excellence), 2004 (for Best Magazine Section), and 2019 (for Single-Topic Issue). With roots beginning in 1872, ''Popular Science'' has been translated into over 30 languages and is distributed to at least 45 countries. Early history ''The Popular Science Monthly'', as the publication was originally called, was founded in May 1872 by Edward L. Youmans to disseminate scientific knowledge to the educated layman. Youmans had previously worked as an editor for the weekly ''Appleton's Journal'' and persuaded them to publish his new journal. Early issues were mostly reprints of English periodicals. The journal became an outlet for writings ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eocene
The Eocene ( ) Epoch is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes from the Ancient Greek (''ēṓs'', "dawn") and (''kainós'', "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch. The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isotope Carbon-13, 13C in the atmosphere was exceptionally low in comparison with the more common isotope Carbon-12, 12C. The end is set at a major extinction event called the ''Grande Coupure'' (the "Great Break" in continuity) or the Eocene–Oligocene extinction event, which may be related to the impact of one or more large bolides in Popigai impact structure, Siberia and in what is now ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chondrichthyes
Chondrichthyes (; ) is a class that contains the cartilaginous fishes that have skeletons primarily composed of cartilage. They can be contrasted with the Osteichthyes or ''bony fishes'', which have skeletons primarily composed of bone tissue. Chondrichthyes are jawed vertebrates with paired fins, paired nares, scales, and a heart with its chambers in series. Extant chondrichthyes range in size from the 10 cm (3.9 in) finless sleeper ray to the 10 m (32 ft) whale shark. The class is divided into two subclasses: Elasmobranchii (sharks, rays, skates, and sawfish) and Holocephali ( chimaeras, sometimes called ghost sharks, which are sometimes separated into their own class). Within the infraphylum Gnathostomata, cartilaginous fishes are distinct from all other jawed vertebrates. Anatomy Skeleton The skeleton is cartilaginous. The notochord is gradually replaced by a vertebral column during development, except in Holocephali, where the notochord stays intact. In some deepwat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bobasatrania
''Bobasatrania'' is an extinct genus of prehistoric bony 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 in northeast Madagascar, from where the type species was described. The genus originated during the late Permian, survived the Permian-Triassic extinction event, and underwent a speciation event during the Triassic (approx 240M years BP) in the shallow coastal waters off the Pangaean supercontinent. Their fossils are therefore found throughout the world, with some of the best examples coming from the Wapiti Lake region of British Columbia, Canada. Past Lives: Chronicles of Canadian Paleontology They have a distinctive diamond-shaped body, forked tail and long thin pectoral fins. The larger species are up to in length, though there are also smaller sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wordie Creek Formation
The Wordie Creek Formation is a geologic formation in Greenland. The Triassic Sediments from the region were first discovered in 1926 and preserve fossils dating back to the Triassic period. The temnospondyl '' Selenocara'' is from this formation. See also * List of fossiliferous stratigraphic units in Greenland This is a list of fossiliferous stratigraphic units in Greenland. List of fossiliferous stratigraphic units See also * List of fossiliferous stratigraphic units in Antarctica * Lists of fossiliferous stratigraphic units in North America * ... References * Triassic Greenland {{Triassic-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pteronisculus
''Pteronisculus'' is an extinct genus of prehistoric ray-finned fish that lived during the Early Triassic and Middle Triassic epochs of the Triassic period. It was first described under the name "''Glaucolepis''" by Erik Stensiö in 1921 and was later shown to be a synonym of ''Pteronisculus'' described by Errol White in 1933. However, because the name "''Glaucolepis''" is preoccupied (it had already been given to the extant lepidopteran '' Glaucolepis'' Braun, 1917), ''Pteronisculus'' became the valid genus name for the Triassic fish.White, E. I. and Moy-Thomas, J. A. (1940): VII.—Notes on the nomenclature of fossil fishes. Part II. Homonyms D–L: Journal of Natural History 11:98–103 Appearance and distribution Like many other early ray-finned fishes, ''Pteronisculus'' had a bullet-shaped skull with large eyes near the front end, and a large gape armed with small to large, conical teeth. Its body was covered with small rhombic scales that show peg-and-socket articulatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boreosomus
''Boreosomus'' (meaning: "boreal body") is an extinct genus of Triassic ray-finned fish. It was first described from the Arctic island of Spitsbergen (Svalbard, Norway), but was later also discovered in other parts of the world. ''Boreosomus'' belongs to the family Ptycholepidae (= Boreosomidae/Chungkingichthyidae). Other genera of this family are '' Acrorhabdus'' (Spitsbergen), ''Ardoreosomus'' (Nevada, United States), '' Chungkingichthys'' (China), '' Ptycholepis'' (global) and ''Yuchoulepis'' (China). Description The type species is ''Boreosomus arcticus'' (= ''Acrolepis arctica'' Woodward, 1912). A characteristic feature of this family is the dorsal fin, which inserts at the level of the pelvic fins in the middle portion of the body. Most contemporary ray-fins have their dorsal fin in a more posterior position, often opposite to the anal fin. Also typical for ptycholepids are the somewhat rectangular, horizontally arranged suborbital bones. Fossil record ''Boreosomus'' h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
