|
Macrobaenidae
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 *'' Cha ... [...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] |
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] |
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] |
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] |
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] |
Cryptodira
The Cryptodira ('' el, hidden neck'') are a suborder of Testudines that includes most living tortoises and turtles. Cryptodira differ from Pleurodira (side-necked turtles) in that they lower their necks and pull the heads straight back into the shells, instead of folding their necks sideways along the body under the shells' marginals. They include among their species freshwater turtles, snapping turtles, tortoises, softshell turtles, and sea turtles. Neck retraction The Cryptodira are characterized by retraction of the head in the vertical plane, which permits for primarily vertical movements and restricted lateral movements outside of the shell. These motions are largely due to the morphology and arrangement of cervical vertebrae. In all recent turtles, the cervical column consists of nine joints and eight vertebrae. Compared to the narrow vertebrae and the closely positioned zygapophyses of the pleurodires, the cryptodires’ vertebrae take on the opposite shape. Their ce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bissekty Formation
The Bissekty Formation (sometimes referred to as Bissekt) is a geologic formation and Lagerstätte which crops out in the Kyzyl Kum desert of Uzbekistan, and dates to the Late Cretaceous Period. Laid down in the mid to late Turonian, it is dated to about 92 to 90 Ma (million years ago). Description The lithology of the sediment largely consists of cross bedded sandstones with interbeds of massive sandstone, well cemented intraformational conglomerate, siltstones and mudstones. Most of the fossils are found as clasts within the conglomerates. Fossil content The Bissekty Formation is characterised by a mix of marine, brackish, freshwater, and terrestrial animal fossils. This stands in contrast the strictly marine fossils found in the underlying Dzheirantui Formation, and indicates that the Bissekty was formed during the regression of a saltwater sea. The coastline expanded inland again in the upper portion of the Bissekty, represented by a proportional increase of fully aquat ... [...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] |
