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Macrobaenids
Macrobaenidae is an extinct family of turtles, known from the Early Cretaceous to Paleogene of Laurasia. Their relationships to other turtles and whether or not they form a monophlyletic group are controversial. They are typically interpreted as stem or crown group cryptodires, but some more recent analyses have found them to lie outside crown group Testudines. Macrobaenids can be distinguished from other testudinatans by the presence of a carotid fenestra, cruciform plastron with strap-like epiplastra, and a lack of extragulars. Genera *'' Anatolemys'' Central Asia, Late Cretaceous ( Khodzhakul Formation, Uzbekistan, Cenomanian, Bissekty Formation, Uzbekistan, Turonian, Bostobe Formation, Kazakhstan, Santonian Yalovach Formation, Tajikistan, Santonian) *'' Appalachemys'' Mooreville Chalk, Alabama, Late Cretaceous (Santonian– Campanian) *'' Asiachelys'' Khulsangol Formation, Mongolia, Early Cretaceous ( Albian) *''Aurorachelys'' Kanguk Formation, Canada,Turonian *'' Chan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anatolemys
''Anatolemys'' is an extinct turtle genus in the family Macrobaenidae. Two species are known, both of which lived in the Late Cretaceous. Fossils were discovered in the Yalovach Formation of Tajikistan, the Kulbikin Member and Khodzhakul and Bissekty Formations of Uzbekistan and the Bostobe Formation of Kazakhstan. With in carapace length, ''Anatolemys maximus'' was one of the three largest macrobaenids along with Early Cretaceous '' Yakemys multiporcata'' and Paleocene The Paleocene, ( ) or Palaeocene, is a geological epoch (geology), epoch that lasted from about 66 to 56 mya (unit), million years ago (mya). It is the first epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), E ... '' Judithemys backmani''. References Further reading * Brinkman, Donald B.; Nessov, L. A.; Peng, Jiang-Hua. Khunnuchelys gen.nov., a new trionychid (Testudines: Trionychidae) from the Late Cretaceous of Inner Mongolia and Uzbekistan. Canadian Journal of Ear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Osteopygis
''Osteopygis'' is a genus of extinct turtle. ''Osteopygis'', as traditionally seen, is a chimera: the postcrania (including the holotype A holotype is a single physical example (or illustration) of an organism, known to have been used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of several ...) belong to a non-marine stem-cryptodire, whilst the crania belong to sea turtles. In 2005 the referred material was split between two taxa: the postcrania remained in ''Osteopygis'', while the crania were reassigned to '' Euclastes wielandi''. References Macrobaenidae Nomina dubia Fossil taxa described in 1868 Taxa named by Edward Drinker Cope Extinct turtles {{turtle-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ilek Formation
The Ilek Formation is a Lower Cretaceous geologic formation in Western Siberia. Many different fossils have been recovered from the formation. It overlies the Late Jurassic Tyazhin Formation and underlies the Albian Kiya Formation. The formation was described by L. A. Ragozin in 1935. It consists of sands with sandstone concretions, layers of silts, clays and marl Marl is an earthy material rich in carbonate minerals, clays, and silt. When hardened into rock, this becomes marlstone. It is formed in marine or freshwater environments, often through the activities of algae. Marl makes up the lower part o ...s. Age of the formation, according to a crude 1962 estimate, is Valanginian(?) - Hauterivian - Barremian. Its thickness varies greatly, reaching 746 m in Teguldet borehole. Fauna A fragmentary wing metatarsal nearly identical to the pterosaur '' Lonchognathosaurus'' is also known. See also * List of pterosaur-bearing stratigraphic units Refere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Khilok Formation
The Khilok Formation is an Early Cretaceous geologic formation in Buryatia, Russia. While the lower portion of the formation consists of sandstone and conglomerates, the upper portion of the formation largely consists of trachybasalt, these deposits have been dated to the Aptian. A thin 20 cm bed is known from the formation containing the remains of numerous indeterminate vertebrates, including dinosaur and pterosaurs and an indeterminate species of ''Kirgizemys''. Fossil content The following fossils were reported from the formation: ;Reptiles * '' Kirgizemys sp.'' * '' Prodeinodon sp.'' * Choristodera indet. * Dromaeosauridae indet. * Hypsilophodontidae indet. * Ornithopoda indet. * Ornithocheiridae indet. * Scincomorpha indet. * Testudines indet. * Titanosauriformes indet. ;Amphibians * Discoglossidae indet. ;Fish * '' Hybodus sp.'' * Amiiformes indet. * Palaeonisciformes indet. * Teleostei indet. See also * List of pterosaur-bearing stratigraphic un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Murtoi Formation
The Murtoi Formation is a geologic formation in vicinity of Lake Gusinoye in Russia. It was deposited in the late Barremian to the mid Aptian of the Early Cretaceous. Paleofauna *'' Kirgizemys dmitrievi'' *'' Tengrisaurus starkovi'' *'' Khurendukhosaurus bajkalensis'' *'' Murtoilestes abramovi'' *'' Stichopterus sp.'' *'' Psittacosaurus.sp'' See also * List of dinosaur-bearing rock formations ** List of stratigraphic units with few dinosaur genera * List of fossiliferous stratigraphic units in Russia References * {{DEFAULTSORT:Fossiliferous stratigraphic units in Russia Geologic formations of Russia, . Paleontology in Russia, . Fossiliferous stratigraphic units of Asia, Russia Fossiliferous stratigraphic units of Europe, Russia R ... References Bibliography * {{ISBN, 0-520-24209-2 Further reading * I. G. Danilov, A. O. Averianov, P. P. Skutschas and A. S. Rezvyi. 2006. ''Kirgizemys'' (Testudines, 'Macrobaenidae'): new material from the Lower Cretaceous o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kirgizemys
''Kirgizemys'' is an extinct genus of turtle from Early Cretaceous of China, South Korea, Mongolia, Russia and Kyrgyzstan Kyrgyzstan,, pronounced or the Kyrgyz Republic, is a landlocked country in Central Asia. Kyrgyzstan is bordered by Kazakhstan to the north, Uzbekistan to the west, Tajikistan to the south, and the People's Republic of China to the east. .... References * Danilov, I. G.; Averianov, A.O.; Skutchas, P.P. & Rezvyi, A.S. 2006. ''Kirgizemys'' (Testudines: Macrobaenidae): New material from the Lower Cretaceous of Buryatia (Russia) and taxonomic revision. pp. 46–62 in I. G. Danilov & J. F. Parham (eds.), Fossil Turtle Research, Vol. 1. * Parham, J.F. & Hutchison, J.H. 2003. A new eucryptodiran turtle from the Late Cretaceous of North America (Dinosaur Provincial Park, Alberta, Canada). J. Vertebr. Paleontol. 23 (4): 783–798. * Shukanov, V.B. 2000Mesozoic turtles of Middle and Central Asia pp. 309–367 in M. J. Benton, M. A. Shishkin, D. M. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xiagou Formation
The Xiagou Formation is the middle strata of the Xinminbao Group. It is named for its type site in Xiagou, in the Changma Basin of Gansu Province, northwestern China and is considered Early Cretaceous in age. It is known outside the specialized world of Chinese geology as the site of a Lagerstätte in which the fossils were preserved of ''Gansus yumenensis'', the earliest true modern bird. Description The laminated yellowish mudstones of the Xiagou Formation are the lithified remnants of varves that were laid down as extremely fine silt settled to the bottom of a tranquil freshwater lake. The result was dense anoxic bottom sediment, where the lack of bacteria slowed the processes of decay, preserving uncompressed fossils in details that include feather impressions and remnants of the webbing between the bird's toes. The age of the formation has not yet been confidently determined. The underlying Chijinpu Formation is likely the same age as the Jehol Group due to the presence ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kanguk Formation
The Kanguk Formation is a geological formation in the Northwest Territories and Nunavut, Canada whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 574-588. . It was first described in the Kanguk Peninsula of the Axel Heiberg Island, along the shore of the Stand Fiord by Souther in 1963.Geological Survey of Canada Map 36-1959 The formation occurs throughout the Sverdrup Basin and the southern Queen Elizabeth Islands. Lithology The Kanguk Formation is composed of dark shale and siltstone with interbeds of sandstone, bentonite and tuff. Thicker sandstone and conglomerate beds occur in the western reaches in Eglinton Island. Fossil content The Kanguk Formation preserves a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aurorachelys
''Aurorachelys'' is an extinct genus of turtle which existed in Canada (Nunavut) during the late Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of th ... period, containing a single species, ''A. gaffneyi''. (Popular presentation of the above report) References {{Testudines Late Cretaceous turtles of North America Macrobaenidae Fossil taxa described in 2009 Prehistoric turtle genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albian
The Albian is both an age of the geologic timescale and a stage in the stratigraphic column. It is the youngest or uppermost subdivision of the Early/Lower Cretaceous Epoch/Series. Its approximate time range is 113.0 ± 1.0 Ma to 100.5 ± 0.9 Ma (million years ago). The Albian is preceded by the Aptian and followed by the Cenomanian. Stratigraphic definitions The Albian Stage was first proposed in 1842 by Alcide d'Orbigny. It was named after Alba, the Latin name for River Aube in France. A Global Boundary Stratotype Section and Point (GSSP), ratified by the IUGS in 2016, defines the base of the Albian as the first occurrence of the planktonic foraminiferan '' Microhedbergella renilaevis'' at the Col de Pré-Guittard section, Arnayon, Drôme, France. The top of the Albian Stage (the base of the Cenomanian Stage and Upper Cretaceous Series) is defined as the place where the foram species '' Rotalipora globotruncanoides'' first appears in the stratigraphic column. The Albia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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