Barun Goyot Formation
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Barun Goyot Formation
The Baruungoyot Formation (also known as Barun Goyot) is a geological formation dating to the Late Cretaceous Period. It is located within and is widely represented in the Gobi Desert Basin, in the Ömnögovi Province of Mongolia. Description It was previously known as the Lower Nemegt Beds occurring beneath the Nemegt Formation and above the Djadokhta Formation. It has been suggested that the Djadokhta and Baruungoyot Formations are lower and upper parts, respectively, of the same lithological unit and the boundary between the two does not exist. The stratotype of the Baruungoyot Formation is the Khulsan locality, east of Nemegt. At Nemegt, only the uppermost barungoyotian beds are visible. The ''Red Beds of Khermeen Tsav'' are also considered part of the Baruungoyot Formation. It is approximately in thickness,Gradzinski, R.; & Jerzykiewicz, T. (1974). Sedimentation of the Barun Goyot formation. Palaeontologica Polonica, 30, 111-146. and was laid down roughly 72-71  ...
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Stratotype
In geology, a stratotype or type section is the physical location or outcrop of a particular reference exposure of a stratigraphic sequence or stratigraphic boundary. If the stratigraphic unit is layered, it is called a stratotype, whereas the standard of reference for unlayered rocks is the type locality. Also it can be defined as "The particular sequence of strata chosen as standard of reference of a layered stratigraphic unit." When a stratigraphic unit is nowhere fully exposed, the original type section may be supplemented with reference sections covering the full thickness of the unit. A reference section may also be defined when the original type section is poorly exposed, or for historical units which were designated without specifying a type section according to more modern standards. See also * Global Boundary Stratotype Section and Point A Global Boundary Stratotype Section and Point (GSSP), sometimes referred to as a golden spike, is an internationally agre ...
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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 ...
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Estesia
''Estesia'' (in honour of Richard Estes) is an extinct genus of Late Cretaceous anguimorph lizard found in the Gobi Desert in Mongolia. Discovery It was discovered in June 1990 by a joint expedition made up of Mongolian and American palaeontologists, and described in 1992 by Mark Norell, Malcolm McKenna and Michael Novacek. This animal is of interest to palaeontologists, not only because it is close to the lineage of modern Gila monsters (''Heloderma''), but also because its dentition shows evidence that it was venomous. The type species is ''E. mongoliensis'', after Mongolia, where it was found. Material for ''Estesia'' has been collected in various localities in the Gobi Desert, including the Barun Goyot Formation, the Djadochta Formation and Ukhaa Tolgod. *IGM M3/14 (holotype): A well-preserved skull with mandible, from Lizard Hill, Khulsan (Barun Goyot Formation) *IGM 3/15: Partial skeleton with associated braincase, from Khermeen Tsav (Barun Goyot Formation), disc ...
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Multituberculate
Multituberculata (commonly known as multituberculates, named for the multiple tubercles of their teeth) is an extinct order of rodent-like mammals with a fossil record spanning over 130 million years. They first appeared in the Middle Jurassic, and reached a peak diversity during the Late Cretaceous and Paleocene. They eventually declined from the mid-Paleocene onwards, disappearing from the known fossil record in the late Eocene. They are the most diverse order of Mesozoic mammals with more than 200 species known, ranging from mouse-sized to beaver-sized. These species occupied a diversity of ecological niches, ranging from burrow-dwelling to squirrel-like arborealism to jerboa-like hoppers. Multituberculates are usually placed as crown mammals outside either of the two main groups of living mammals, Theria — placentals and marsupials — and Monotremata,Agustí-Antón 2002, pp 3-4 but usually as closer to Theria than to monotremes. They are considered to be closely re ...
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Chulsanbaatar
''Chulsanbaatar'' is an extinct genus of mammal from the Cretaceous of Mongolia. It was a member of the order of Multituberculata and is within the suborder Cimolodonta. The genus ''Chulsanbaatar'' was named by Zofia Kielan-Jaworowska in 1974 , after the locality of Khulsan near the dig sites where these organisms were found, and Ulan Bator, the capital of Mongolia. Fossil remains of the species ''Chulsanbaatar vulgaris'' have been found in multiple localities in the Gobi Desert, including the Red Beds of Hermiin Tsav (also known as Khermeen Tsav, part of the Barun Goyot Formation) in Mongolia. They range in the fossil record from 84 to 71 million years ago, from the late Santonian, through the Campanian and early Maastrichtian ages. This small multituberculate had a long skull. Remarkably, it has been possible to study the ear bones, which shows how well some of the fossils are preserved. With several intact skulls having been found, it can be determined that ''C.vulgaris' ...
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Djadochtatheriid
Djadochtatheriidae is a family of fossil mammals within the extinct order Multituberculata. Remains are known from the Upper Cretaceous of Central Asia. These animals lived during the Mesozoic, also known as the "age of the dinosaurs". This family is part of the suborder of Cimolodonta. The taxon Djadochtatheriidae was named by Zofia Kielan-Jaworowska and Jørn Hurum in 1997. Multituberculates are a rather diverse group in terms of locomotion and diet. Forms like ''Kryptobaatar'' and ''Catopsbaatar'' were hopping, jerboa-like omnivores (and this is probably the ancestral condition for the group, given that ''Nemegtbaatar ''Nemegtbaatar'' is an extinct genus of mammal from the Upper Cretaceous Period of what is now Central Asia. It belonged to the order Multituberculata. ''Nemegtbaatar'' is within the suborder Cimolodonta and is a member of the superfamily Dja ...'' also had this lifestyle), while '' Mangasbaatar'' was a robust, digging herbivore.Rougier et al, 2016 Notes ...
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Catopsbaatar
''Catopsbaatar'' is a genus of multituberculate, an extinct Order (biology), order of rodent-like mammals. It lived in what is now Mongolia during the late Campanian age of the Late Cretaceous epoch (geology), epoch, about 72 million years ago. The first fossils were collected in the early 1970s, and the animal was named as a new species of the genus ''Djadochtatherium'' in 1974, ''D. catopsaloides''. The Specific name (zoology), specific name refers to the animal's similarity to the genus ''Catopsalis''. The species was moved to the genus ''Catopsalis'' in 1979, and received its own genus (''Catopsbaatar'', Greek and Mongolian for 'visible hero') in 1994. Five skulls, one molar, and one skeleton with a skull are known; the last is the genus' most complete specimen. ''Catopsbaatar'' was a member of the family Djadochtatheriidae. The skull of ''Catopsbaatar'' was up to long and, as in other multituberculates, proportionally large. The external appearance of these animals' h ...
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Eutheria
Eutheria (from Greek , 'good, right' and , 'beast'; ), also called Pan-Placentalia, is the clade consisting of Placentalia, placental mammals and all therian mammals that are more closely related to placentals than to marsupials. Eutherians are distinguished from non-eutherians by various phenotypic traits of the feet, ankles, jaws and teeth. All extant eutherians lack epipubic bones, which are present in all other living mammals (marsupials and monotremes). This allows for expansion of the abdomen during pregnancy, though epipubic bones are present in many primitive eutherians. Eutheria was named in 1872 by Theodore Gill; in 1880, Thomas Henry Huxley defined it to encompass a more broadly defined group than Placentalia. The earliest unambiguous eutherians are known from the Early Cretaceous Yixian Formation of China, dating around 120 million years ago. Two tribosphenic mammals, ''Durlstodon'' and ''Durlstotherium'' from the Berriasian age (~145–140 million years ago) of t ...
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