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Timeline Of Pachycephalosaur Research
This timeline of pachycephalosaur research is a chronological listing of events in the history of paleontology focused on the pachycephalosaurs, a group of dome-skulled herbivorous marginocephalian dinosaurs. One of the first major events related to the history of pachycephalosaur research actually regards the discovery of an unrelated dinosaur called ''Troodon'', reported from the western United States by Joseph Leidy in 1856. The type specimen of ''Troodon'' was simply an unusual tooth, but the close resemblance between ''Troodon'' teeth and pachycephalosaur teeth would cause taxonomic confusion for over a century. This was resolved by Phil Currie in 1987, who realized that ''Troodon'' belonged to a group of bird-like carnivores then known as saurornithoidids, but since renamed Troodontidae after ''Troodon'' itself. The first scientifically documented true pachycephalosaur remains were discovered in Early Cretaceous rocks from England and named ''Stenopelix'' not long after ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pachycephalosaurus In Japan
''Pachycephalosaurus'' (; meaning "thick-headed lizard", from Greek ''pachys-/'' "thick", ''kephale/'' "head" and ''sauros/'' "lizard") is a genus of pachycephalosaurid dinosaurs. The type species, ''P. wyomingensis'', is the only known species, but some researchers argue that there might be a second species, ''P. spinifer''. It lived during the Late Cretaceous Period (Maastrichtian stage) of what is now North America. Remains have been excavated in Montana, South Dakota, Wyoming, and Alberta. It was a herbivorous creature which is primarily known from a single skull and a few extremely thick skull roofs, at 22 centimetres (9 inches) thick. More complete fossils have been found in recent years. ''Pachycephalosaurus'' was among the last non-avian dinosaurs before the Cretaceous–Paleogene extinction event. The genus ''Tylosteus'' has been synonymized with ''Pachycephalosaurus'', as have the genera ''Stygimoloch'' and ''Dracorex'' in recent studies. Like other pachycephalosaurid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Cretaceous
The Early Cretaceous (geochronology, geochronological name) or the Lower Cretaceous (chronostratigraphy, chronostratigraphic name), is the earlier or lower of the two major divisions of the Cretaceous. It is usually considered to stretch from 145 Megaannum#SI prefix multipliers, Ma to 100.5 Ma. Geology Proposals for the exact age of the Barremian-Aptian boundary ranged from 126 to 117 Ma until recently (as of 2019), but based on drillholes in Svalbard the defining Anoxic event#Cretaceous, early Aptian Oceanic Anoxic Event 1a (OAE1a) was carbon isotope dated to 123.1±0.3 Ma, limiting the possible range for the boundary to c. 122–121 Ma. There is a possible link between this anoxic event and a series of Early Cretaceous large igneous provinces (LIP). The Ontong Java Plateau, Ontong Java-Manihiki Plateau, Manihiki-Hikurangi Plateau, Hikurangi large igneous province, emplaced in the South Pacific at c. 120 Ma, is by far the largest LIP in Earth's history. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Science Fiction
Science fiction (sometimes shortened to Sci-Fi or SF) is a genre of speculative fiction which typically deals with imaginative and futuristic concepts such as advanced science and technology, space exploration, time travel, parallel universes, extraterrestrial life, sentient artificial intelligence, cybernetics, certain forms of immortality (like mind uploading), and the singularity. Science fiction predicted several existing inventions, such as the atomic bomb, robots, and borazon, whose names entirely match their fictional predecessors. In addition, science fiction might serve as an outlet to facilitate future scientific and technological innovations. Science fiction can trace its roots to ancient mythology. It is also related to fantasy, horror, and superhero fiction and contains many subgenres. Its exact definition has long been disputed among authors, critics, scholars, and readers. Science fiction, in literature, film, television, and other media, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1955 In Paleontology
Plants Pteridophyta Dinosaurs * ''Massospondylus'' gastroliths are documented.Bond (1955). Sanders, Manley, and Carpenter (2001), "Table 12.1" page 167. Newly named dinosaurs Data courtesy of George Olshevsky's dinosaur genera list. Synapsids Theriodonts Eutherians Cetaceans References {{portal, Paleontology * Bond, G. 1955. A note on dinosaur remains from the Forest Sandstone (Upper Karoo). Occasional Papers of the National Museum of Rhodesia 2: 795–800. * Sanders F, Manley K, Carpenter K. Gastroliths from the Lower Cretaceous sauropod Cedarosaurus weiskopfae. In: Tanke D.H, Carpenter K, editors. Mesozoic vertebrate life: new research inspired by the paleontology of Philip J. Currie. Indiana University Press; Bloomington, IN: 2001. pp. 166–180. 1950s in paleontology Paleontology Paleontology (), also spelled palaeontology or palæontology, is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene epoch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Battering Ram
A battering ram is a siege engine that originated in ancient times and was designed to break open the masonry walls of fortifications or splinter their wooden gates. In its simplest form, a battering ram is just a large, heavy log carried by several people and propelled with force against an obstacle; the ram would be sufficient to damage the target if the log were massive enough and/or it were moved quickly enough (that is, if it had enough momentum). Later rams encased the log in an arrow-proof, fire-resistant canopy mounted on wheels. Inside the canopy, the log was swung from suspensory chains or ropes. Rams proved effective weapons of war because at the time wall-building materials such as stone and brick were weak in tension, and therefore prone to cracking when impacted with force. With repeated blows, the cracks would grow steadily until a hole was created. Eventually, a breach would appear in the fabric of the wall, enabling armed attackers to force their way throu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edwin Colbert
Edwin Harris "Ned" Colbert (September 28, 1905 – November 15, 2001)O'Connor, Anahad ''The New York Times'', November 25, 2001. was a distinguished American vertebrate paleontologist and prolific researcher and author. Born in Clarinda, Iowa, he grew up in Maryville, Missouri and graduated from Maryville High School. His father was George H. Colbert who was head of the mathematics department at Northwest Missouri State University and had been at the college since its founding in 1906. He received his A.B. from the University of Nebraska, then his Masters and Ph.D. from Columbia University, finishing in 1935. He married Margaret Matthew, daughter of the eminent paleontologist William Diller Matthew, in 1933. She became a noted artist, illustrator, and sculptor who specialized in visualizing extinct species. The couple had five sons together. The young family moved to Leonia, New Jersey, in 1937 and lived there for decades. Among the positions Colbert held was Curator of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Mortram Sternberg
Charles Mortram Sternberg (1885–1981) was an American-Canadian fossil collector and paleontologist, son of Charles Hazelius Sternberg. Late in his career, he collected and described '' Pachyrhinosaurus'', '' Brachylophosaurus'', '' Parksosaurus'' and ''Edmontonia''. A contemporary author wrote, "No published study of Canadian dinosaurs is possible today without citing one or another of Sternberg's papers." Early life Charles Mortram Sternberg was born in Lawrence, Kansas, from a family of famous American fossil collectors. Sternberg's highest level of education was a Kansas high school degree. Career Sternberg moved with his father and two brothers, Levi and George, to Ottawa, Ontario, Canada in 1912. The four began working in Alberta collecting dinosaurs on behalf of the Geological Survey of Canada. This work was in competition with the American Museum of Natural History (New York) who were collecting many fossil skeletons and shipping them out of Canada. Following Lawre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1943 In Paleontology
Dinosaurs Newly named dinosaurs Data are courtesy of George Olshevky's dinosaur genera list. Plesiosaurs New taxa Synapsids Non-mammalian References {{portal, Paleontology 1940s in paleontology Paleontology Paleontology (), also spelled palaeontology or palæontology, is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene epoch (roughly 11,700 years before present). It includes the study of fossi ... Paleontology 3 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pachycephalosaurus
''Pachycephalosaurus'' (; meaning "thick-headed lizard", from Greek ''pachys-/'' "thick", ''kephale/'' "head" and ''sauros/'' "lizard") is a genus of pachycephalosaurid dinosaurs. The type species, ''P. wyomingensis'', is the only known species, but some researchers argue that there might be a second species, ''P. spinifer''. It lived during the Late Cretaceous Period (Maastrichtian stage) of what is now North America. Remains have been excavated in Montana, South Dakota, Wyoming, and Alberta. It was a herbivorous creature which is primarily known from a single skull and a few extremely thick skull roofs, at 22 centimetres (9 inches) thick. More complete fossils have been found in recent years. ''Pachycephalosaurus'' was among the last non-avian dinosaurs before the Cretaceous–Paleogene extinction event. The genus ''Tylosteus'' has been synonymized with ''Pachycephalosaurus'', as have the genera ''Stygimoloch'' and ''Dracorex'' in recent studies. Like other pachycephalosa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Whitney Gilmore
Charles Whitney Gilmore (March 11, 1874 – September 27, 1945) was an American paleontologist who gained renown in the early 20th century for his work on vertebrate fossils during his career at the United States National Museum (now the National Museum of Natural History). Gilmore named many dinosaurs in North America and Mongolia, including the Cretaceous sauropod ''Alamosaurus'', ''Alectrosaurus'', '' Archaeornithomimus'', '' Bactrosaurus'', ''Brachyceratops'', ''Chirostenotes'', '' Mongolosaurus'', '' Parrosaurus'', '' Pinacosaurus'', ''Styracosaurus ovatus'' (now ''Rubeosaurus'') and ''Thescelosaurus''. Career Gilmore was working as a paleontologist for the Carnegie Museum of Natural History in 1901 when he found the skeleton of a young sauropod, which was classified the following year as an ''Apatosaurus''. In 1903 Gilmore was hired by the United States National Museum (now the National Museum of Natural History), part of the Smithsonian Institution. His first assign ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1924 In Paleontology
Dinosaurs Newly named dinosaurs Data courtesy of George Olshevsky's dinosaur genera list. Plesiosaurs New taxa Synapsids Non-mammalian References {{portal, Paleontology 1920s in paleontology Paleontology Paleontology (), also spelled palaeontology or palæontology, is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene epoch (roughly 11,700 years before present). It includes the study of fossi ... Paleontology 4 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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