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Oshih Formation
The Khuren Dukh Formation, also known as the Khukhtyk Formation, Khukhteeg Formation, or Hühteeg Svita, (, ), is a geological Formation (geology), formation in Mongolia whose strata date back to the Aptian–Albian ages of the Early Cretaceous.Nichols et al., 2006 Dinosaur remains are among the fossils that have been recovered from the formation.Weishampel et al., 2004, pp.563-570 Vertebrate paleofauna Dinosaurs The earliest record of Pachycephalosauridae, Pachycephalosauria.https://vertpaleo.org/wp-content/uploads/2023/10/2023_SVP_Program-Final-10032023.pdf Choristoderes See also * List of dinosaur-bearing rock formations References Bibliography * * * * {{DEFAULTSORT:Huhteeg Svita Geologic formations of Mongolia Lower Cretaceous Series of Asia Cretaceous Mongolia Albian Stage Sandstone formations Mudstone formations Lacustrine deposits Paleontology in Mongolia Dornogovi Province, Formations ... [...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] |
Dinosaur
Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic Geological period, period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the #Evolutionary history, evolution of dinosaurs is a subject of active research. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201.3 mya and their dominance continued throughout the Jurassic and Cretaceous periods. The fossil record shows that birds are feathered dinosaurs, Evolution of birds, having evolved from earlier Theropoda, theropods during the Late Jurassic epoch, and are the only dinosaur lineage known to have survived the Cretaceous–Paleogene extinction event approximately 66 mya. Dinosaurs can therefore be divided into avian dinosaurs—birds—and the extinct non-avian dinosaurs, which are all dinosaurs other than birds. Dinosaurs are varied from taxonomy (biology), taxonomic, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tchoiria
''Tchoiria'' ('')'' is a genus of neochoristoderan reptile from the Cretaceous, Early Cretaceous of Mongolia. The name ''Tchoiria'' comes from the city of Choir, Mongolia, Choir which is nearby to where the holotype was found. ''Tchoiria'' is thought to have a similar diet to another neochoristoderan reptile, ''Champsosaurus'', due to morphology of the skull. It would hunt in freshwater environments, like the living gharials, where it would prey on many different types of fish and turtles. History of research ''Tchoiria'' remains were first recovered as a part of the Joint Soviet-Mongolian Expeditions which took place in the Gobi Desert. They were described by Mikhail B. Efimov in 1975; basing his description on a partial cranium and some parts of the postaxial skeleton found at the Huhteeg formation, Hühteeg Formation. He would make the type species ''T. namsari''. Efimov would name two other ''Tchoiria'' species in the latter 20th century, ''T. magnus'' in 1979 and ''T. eglo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Khurendukhosaurus
''Khurendukhosaurus'' is a genus of choristodere, a type of amphibious reptile. It is known from Lower Cretaceous rocks of Mongolia and Russia. Two species have been named. The type species, ''K. orlovi'', was named in 1984 by Sigogneau–Russell and Efimov for the fragmentary postcranial skeleton PIN 3386/3. This specimen was discovered in the Albian-age Lower Cretaceous Khuren Dukh Formation Formation at Hüren Dukh, central Mongolia. The lake deposits at this site also contain fossils of the choristoderes '' Irenosaurus'' and ''Tchoiria''. Other postcranial bones of ''K. orlovi'' have been found at this site as well. Second species ''K. bajkalensis'' was named by Efimov in 1996 for PIN 2234/201, consisting of a scapulocoracoid and a rib. These bones were found in the Lower Cretaceous Murtoi Formation at Lake Gusinoye, Buryatia, Russia. The first Russian choristodere, Efimov and Storrs (2000) found it difficult to distinguish from ''K. orlovi'' based on the sma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Choristodera
Choristodera (from the Greek χωριστός ''chōristos'' + δέρη ''dérē'', 'separated neck') is an extinct order of semiaquatic diapsid reptiles that ranged from the Middle Jurassic, or possibly Triassic, to the Miocene (168 to 20 or possibly 11.6 million years ago). Choristoderes are morphologically diverse, with the best known members being the crocodile-like neochoristoderes such as '' Champsosaurus''. Other choristoderans had lizard-like or long necked morphologies. Choristoderes appear to have been confined to the Northern Hemisphere, having been found in North America, Asia, and Europe, and possibly also North Africa. Choristoderes are generally thought to be derived neodiapsids that are close relatives or members of Sauria. History of discovery Choristodera was erected in 1876, originally as a suborder of Rhynchocephalia by Edward Drinker Cope to contain '' Champsosaurus,'' which was described from Late Cretaceous strata of Montana by Cope in the same paper ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harpymimus Steveoc (flipped)
''Harpymimus'' is a basal ornithomimosaurian theropod dinosaur from the Early Cretaceous Period of what is now Mongolia. Unlike later, more derived ornithomimosaurs, ''Harpymimus'' still possessed teeth, although they appear to have been restricted to the dentary of the lower jaw. Discovery and naming In 1981, a Soviet-Mongolian expedition uncovered a theropod skeleton in the Gobi Desert. In 1984 this was named and shortly described by Rinchen Barsbold and Altangerel Perle as the type and only species of the new genus ''Harpymimus'': ''Harpymimus okladnikovi''. The generic name ''Harpymimus'' is a reference to the fearsome Harpy of Greek mythology and derived from Greek ἅρπυια (''harpyia''), "Harpy", and μῖμος (''mimos''), "mimic". The specific name honours the late Soviet archeologist Alexey Pavlovich Okladnikov. The holotype specimen IGM 100/29 (Mongolian Academy of Sciences, Ulaanbaatar, Mongolia) consists of an almost complete and articulated but compressed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ornithomimosauria
Ornithomimosauria ("bird-mimic lizards") are theropod dinosaurs which bore a superficial resemblance to the modern-day ostrich. They were fast, omnivorous or herbivorous dinosaurs from the Cretaceous Period of Laurasia (now Asia, Europe and North America), as well as possibly Africa. The group first appeared in the Early Cretaceous and persisted until the Late Cretaceous. Primitive members of the group include '' Nqwebasaurus'', '' Pelecanimimus'', '' Shenzhousaurus'', '' Hexing'' and '' Deinocheirus'', the arms of which reached 2.4 m (8 feet) in length. More advanced species, members of the family Ornithomimidae, include '' Gallimimus'', '' Struthiomimus'', and '' Ornithomimus''. Some paleontologists, like Paul Sereno, consider the enigmatic alvarezsaurids to be close relatives of the ornithomimosaurs and place them together in the superfamily Ornithomimoidea (see classification below). Description The skulls of ornithomimosaurs were small, with large eyes, above ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harpymimus
''Harpymimus'' is a basal ornithomimosaurian theropod dinosaur from the Early Cretaceous Period (geology), Period of what is now Mongolia. Unlike later, more derived ornithomimosaurs, ''Harpymimus'' still possessed teeth, although they appear to have been restricted to the dentary of the lower jaw. Discovery and naming In 1981, a Soviet-Mongolian expedition uncovered a theropod skeleton in the Gobi Desert. In 1984 this was named and shortly described by Rinchen Barsbold and Altangerel Perle as the Type species, type and only species of the new genus ''Harpymimus'': ''Harpymimus okladnikovi''. The generic name ''Harpymimus'' is a reference to the fearsome Harpy of Greek mythology and derived from Greek ἅρπυια (''harpyia''), "Harpy", and μῖμος (''mimos''), "mimic". The specific name (zoology), specific name honours the late Soviet archeologist Alexey Pavlovich Okladnikov. The holotype specimen IGM 100/29 (Mongolian Academy of Sciences, Ulaanbaatar, Mongolia) consists ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iguanodont
Ornithopoda () is a clade of ornithischian dinosaurs, called ornithopods (). They represent one of the most successful groups of herbivore, herbivorous dinosaurs during the Cretaceous. The most primitive members of the group were bipedal and relatively small-sized, while advanced members of the subgroup Iguanodontia became quadrupedal and developed large body size. 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 Hadrosauridae, hadrosaurids (colloquially known as 'duck-bills'), before they were wiped out by the Cretaceous–Paleogene extinction event along with all other non-aves, avian dinosaurs. Members are known worldwide. History of research In 1870, Thomas Henry Huxley listed Iguanodontidae (coined by Edward Drinker Cope a year earlier) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iguanodon
''Iguanodon'' ( ; meaning 'iguana-tooth'), named in 1825, is a genus of iguanodontian dinosaur. While many species found worldwide have been classified in the genus ''Iguanodon'', dating from the Late Jurassic to Early Cretaceous, Taxonomy (biology), taxonomic revision in the early 21st century has defined ''Iguanodon'' to be based on one well-substantiated species: ''I. bernissartensis'', which lived during the Barremian to early Aptian ages of the Early Cretaceous in Belgium, Germany, England, and Spain, between about 126 and 122 million years ago. ''Iguanodon'' was a large, bulky herbivory, herbivore, measuring up to in length and in body mass. Distinctive features include large thumb spikes, which were possibly used for defense against predation, predators, combined with long prehensile fifth fingers able to forage for food. The genus was named in 1825 by English geologist Gideon Mantell, based on fossil specimens found in England and was given the species name ''I. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Choyrodon Skull
''Choyrodon'' is a genus of hadrosauroid dinosaur from the Early Cretaceous Albian-age Khuren Dukh Formation of Mongolia. The type and only species is ''Choyrodon barsboldi''. The generic name is derived from the city of Choyr, and ''-odon'', from Latin for tooth; the specific name ''barsboldi'' honours paleontologist Rinchen Barsbold. The material consists of a holotype partial skull and cervical ribs, with two other partial skulls both with associated postcranial material. It was found to be the sister taxon of ''Eolambia''. History and naming Three specimens of a new iguanodontian were discovered in the Khuren Dukh Formation of Mongolia by an expedition led by Mongolian paleontologist Rinchen Barsbold. These three specimens, stored in the Mongolian Natural History Museum, were found within the same sediments that had yielded the iguanodontian ''Altirhinus'', but comparisons showed that they represented different taxa and so in 2018 American paleontologist Terry Gates and coll ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
