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Macrobaenidae
Macrobaenidae is an extinct family of turtles, known from the Early Cretaceous to Paleogene of Laurasia. Their relationships to other turtles and whether 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 *'' Changmachel ... [...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 Formation, 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, Yakemys multiporcata'' and Paleocene ''Judithemys, 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 Earth Sciences October 1993. * Vitek, Natasha S.; Danilov, Igor G.. Soft-shelled turtles (Trionychidae) from the Cenomanian of Uzbekistan. Cretaceous Research May 2014. Macrobaenidae Prehistoric turtle genera ... [...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, officially the Kyrgyz Republic, is a landlocked country in Central Asia lying in the Tian Shan and Pamir Mountains, Pamir mountain ranges. Bishkek is the Capital city, capital and List of cities in Kyrgyzstan, largest city. Kyrgyz .... 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. U ... [...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 (Latin: ''holotypus'') is a single physical example (or illustration) of an organism used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of s ...) 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 Late Cretaceous turtles Paleogene turtles Nomina dubia Fossil taxa described in 1868 Taxa named by Edward Drinker Cope {{Paleo-turtle-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bissekty Formation
The Bissekty Formation (sometimes referred to as Bissekt) is a formation (geology), geologic formation and Lagerstätte which outcrop, crops out in the Kyzyl Kum desert of Uzbekistan, and dates to the Late Cretaceous Period (geology), 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 (geology), 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 (ocean), marine, Brackish water, brackish, freshwater, and Terrestrial animal, 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 co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Murtoi Formation
The Murtoi Formation is a geologic formation in vicinity of Lake Gusinoye in Russia. The Murtoi Fm's sedimentation age (136–130 Ma). It was deposited in the late Valanginian to Early Hauterivian of the Early Cretaceous. Scientists were able to recreate the paleoenvironment at the time of the commencement of sedimentation in the Gusinoozersk Basin during the deposition of the Murtoi Fm based on fossils discovered at the Mogoito location. The greatest amount of vertebrate remains from the Gusinoozersk Basin were found there. The Mogoito locality exposes strata from the Murtoi Fm through a sequence of naturally occurring outcrops in shallow ravines and scours on the western edge of Lake Gusinoe. The area is a valuable resource for learning about Central Asia's vertebrate fauna from the Early Cretaceous. Petrified wood remnants and rare fragmented dinosaur fossils can be found in the lower alluvial-proluvial Murtoi section of the Mogoito locality. The area is composed of big and 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 o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryptodira
The Cryptodira (') are a suborder of Testudines that includes most living tortoises and turtles. Cryptodira is commonly called the "Hidden-Neck Turtles" or the "Inside-Neck 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 pleur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Appalachemys
''Appalachemys'' is an extinct genus of macrobaenid turtle that lived during the Late Cretaceous period.Gentry, A., Kierman, C. R., & Parham, J. F. (2023). A large non-marine turtle from the upper cretaceous of Alabama and a review of north American “macrobaenids”. The Anatomical Record, 306, 1411–1430. It is a monotypic genus known from a single species, ''A. ebersolei'', which was named after Jun Ebersole. History and Description Appalachemys is known from specimen ALMNH PV985.24 at the Alabama Museum of Natural History. The type locality is unknown. ''Appalachemys'' is over 80 cm long. Distribution and habitat ''Appalachemys'' lived in Alabama in the Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the .... References {{Taxonbar, from=Q131106504 Macrobaenida ... [...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 period, containing a single species, ''A. gaffneyi''. (Popular presentation of the above report) The type specimen is UR 06.085 at the University of Rochester The University of Rochester is a private university, private research university in Rochester, New York, United States. It was founded in 1850 and moved into its current campus, next to the Genesee River in 1930. With approximately 30,000 full .... References Late Cretaceous turtles of North America Macrobaenidae Fossil taxa described in 2009 Prehistoric turtle genera {{Paleo-turtle-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Campanian
The Campanian is the fifth of six ages of the Late Cretaceous epoch on the geologic timescale of the International Commission on Stratigraphy (ICS). In chronostratigraphy, it is the fifth of six stages in the Upper Cretaceous Series. Campanian spans the time from 83.6 (± 0.2) to 72.1 (± 0.2) million years ago. It is preceded by the Santonian and it is followed by the Maastrichtian. The Campanian was an age when a worldwide sea level rise covered many coastal areas. The morphology of some of these areas has been preserved: it is an unconformity beneath a cover of marine sedimentary rocks. Etymology The Campanian was introduced in scientific literature by Henri Coquand in 1857. It is named after the French village of Champagne in the department of Charente-Maritime. The original type locality was a series of outcrops near the village of Aubeterre-sur-Dronne in the same region. Definition The base of the Campanian Stage is defined as a place in the stratigraphic ... [...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. 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 an extensive record of shelf assembla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
