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Bayan Shireh Formation
The Bayanshiree Formation (also known as Baynshiree/Baynshire, Baynshirenskaya Svita, Baysheen Shireh, or Bayan Shireh) is a geological formation in Mongolia, that dates to the Cretaceous period. It was first described and established by Vasiliev et al. 1959. Description The Bayanshiree Formation is primarily composed by varicoloured claystones and sandstones with calcareous concretions and characterized by grey mudstones and yellowish-brown medium grained sandstones. Up to thick, the most complete sections are found in the eastern Gobi Desert, consisting of fine-grained, often cross-stratified gray sandstone interbedded with claystone and concretionary, intraformational Conglomerate (geology), conglomerates with relatively thick units of red to brown mudstone in the upper part. The Baynshire and Burkhant localities are mainly composed by mudstone, siltstone, sandstone, and conglomerates, with most of their sedimentation being fluvial. The environments that were present on the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2016 In Paleontology
Flora Plants Fungi Cnidarians Research * ''Yunnanoascus haikouensis'', previously thought to be a member of Ctenophora, is reinterpreted as a Crown group, crown-group medusozoan by Han ''et al.'' (2016). * A study on the fossil corals from the Late Triassic (Norian) outcrops in Antalya Province (Turkey), indicating that the corals lived in symbiosis with Photosynthesis, photosynthesizing dinoflagellate algae, is published by Frankowiak ''et al.'' (2016). New taxa Arthropods Bryozoans Brachiopods Molluscs Echinoderms Conodonts Fishes Amphibians Research * A study on the histology and growth histories of the Humerus, humeri of the specimens of ''Acanthostega'' recovered from the mass-death deposit of Stensiö Bjerg (Greenland) is published by Sanchez ''et al.'' (2016), who argue that even the largest individuals from this deposit are juveniles. * Fossils of a tetrapod resembling ''Ichthyostega'' and a probable Whatcheeriidae, whatcheeriid-Evolutionary grade, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydralmosaurus Serpentinus
''Styxosaurus'' is a genus of plesiosaur of the family Elasmosauridae. ''Styxosaurus'' lived during the Campanian age of the Cretaceous period. Three species are known: ''S. snowii'', ''S. browni'', and ''S. rezaci''. Discovery The holotype specimen of ''Styxosaurus snowii'' a complete skull and 20 vertebrae and was first described by S.W. Williston ''Styxosaurus'' is named for the mythological River Styx ('), which separated the Greek underworld from the world of the living. The ''-saurus'' part comes from the Greek ' (), meaning "lizard" or "reptile." The type specimen was found on Hell Creek in Logan County, Kansas, which is the source of the genus name coined by Samuel Paul Welles, who described the genus in 1943. Another more complete specimen, SDSMT 451, was discovered near Iona, South Dakota, also in the US, in 1945. The specimen was originally described and named ''Alzadasaurus pembertoni'' by Welles and Bump (1949) and remained so until it was synonymized with ''S. sno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pierre Shale
The Pierre Shale is a geologic formation or series in the Upper Cretaceous which occurs east of the Rocky Mountains in the Great Plains, from Pembina Valley in Canada to New Mexico. The Pierre Shale was described by Fielding Bradford Meek, Meek and Ferdinand Vandeveer Hayden, Hayden in 1862 in the Proceedings of the Academy of Sciences (Philadelphia). They described it as a dark-gray shale, fossiliferous, with veins and seams of gypsum, and concretions of iron oxide. The Pierre Shale is about 3,138 feet (956m) thick at the type locality. It overlies the Niobrara Chalk, Niobrara division and underlies the Fox Hills beds. It was named for an occurrence near Fort Pierre, South Dakota, Fort Pierre on the Missouri River in South Dakota. The Pierre Shale is of marine origin and was deposited in the Western Interior Seaway. It is correlative with other marine shales that occur farther west, such as the Bearpaw Shale Formation, Bearpaw Shale, Mancos Shale and the Lewis Shale. It corre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Styxosaurus Browni
''Styxosaurus'' is a genus of plesiosaur of the family Elasmosauridae. ''Styxosaurus'' lived during the Campanian age of the Cretaceous period. Three species are known: ''S. snowii'', ''S. browni'', and ''S. rezaci''. Discovery The holotype specimen of ''Styxosaurus snowii'' a complete skull and 20 vertebrae and was first described by S.W. Williston ''Styxosaurus'' is named for the mythological River Styx ('), which separated the Greek underworld from the world of the living. The ''-saurus'' part comes from the Greek ' (), meaning "lizard" or "reptile." The type specimen was found on Hell Creek in Logan County, Kansas, which is the source of the genus name coined by Samuel Paul Welles, who described the genus in 1943. Another more complete specimen, SDSMT 451, was discovered near Iona, South Dakota, also in the US, in 1945. The specimen was originally described and named ''Alzadasaurus pembertoni'' by Welles and Bump (1949) and remained so until it was synonymized with ''S. sno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1999 In Paleontology
Flora Ferns and fern allies Cycads Angiosperms Arthropods Insects Mollusca Newly named bivalves Fish Newly named actinopterygii ("ray-finned fish") Reptiles Archosauromorphs * Ornithomimid gastroliths documented.Kobayashi et al. (1999). Sanders, Manley, and Carpenter (2001), "Table 12.1" page 167. Newly named dinosauriforms Newly named dinosaurs Data courtesy of George Olshevsky's dinosaur genera list. Newly named birds Newly named pterosaurs Lepidosauromorphs Newly named plesiosaurs Newly named scincomorphans Other Animals References {{commons category 1999 in paleontology, 1990s in paleontology 1999 in science, Paleontology ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Styxosaurus Snowii
''Styxosaurus'' is a genus of plesiosaur of the family Elasmosauridae. ''Styxosaurus'' lived during the Campanian age of the Cretaceous period. Three species are known: ''S. snowii'', ''S. browni'', and ''S. rezaci''. Discovery The holotype specimen of ''Styxosaurus snowii'' a complete skull and 20 vertebrae and was first described by S.W. Williston ''Styxosaurus'' is named for the mythological River Styx ('), which separated the Greek underworld from the world of the living. The ''-saurus'' part comes from the Greek ' (), meaning "lizard" or "reptile." The type specimen was found on Hell Creek in Logan County, Kansas, which is the source of the genus name coined by Samuel Paul Welles, who described the genus in 1943. Another more complete specimen, SDSMT 451, was discovered near Iona, South Dakota, also in the US, in 1945. The specimen was originally described and named ''Alzadasaurus pembertoni'' by Welles and Bump (1949) and remained so until it was synonymized with ''S. sno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Niobrara Formation
The Niobrara Formation , also called the Niobrara Chalk, is a geologic formation in North America that was deposited between 87 and 82 million years ago during the Coniacian, Santonian, and Campanian stages of the Late Cretaceous. It is composed of two structural units, the Smoky Hill Chalk Member overlying the Fort Hays Limestone Member. The chalk formed from the accumulation of coccoliths from microorganisms living in what was once the Western Interior Seaway, an inland sea that divided the continent of North America during much of the Cretaceous. It underlies much of the Great Plains of the US and Canada. Evidence of vertebrate life is common throughout the formation and includes specimens of plesiosaurs, mosasaurs, pterosaurs, and several primitive aquatic birds. The type locality for the Niobrara Chalk is the Niobrara River in Knox County in northeastern Nebraska. The formation gives its name to the Niobrara cycle of the Western Interior Seaway. History of expl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Late Cretaceous
The Late Cretaceous (100.5–66 Ma) is the more recent of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', the Latin word for the white limestone known as chalk. The chalk of northern France and the white cliffs of south-eastern England date from the Cretaceous Period. Climate During the Late Cretaceous, the climate was warmer than present, although throughout the period a cooling trend is evident. The tropics became restricted to equatorial regions and northern latitudes experienced markedly more seasonal climatic conditions. Geography Due to plate tectonics, the Americas were gradually moving westward, causing the Atlantic Ocean to expand. The Western Interior Seaway divided North America into eastern and western halves; Appalachia and Laramidia. India maintained a northward course towards Asia. In the Southern Hemisphere, Aus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alzadasaurus Kansasensis
''Thalassomedon'' (from Greek, ''thalassa'', "sea" and Greek, ''medon'', "lord" or "ruler", meaning "sea lord") is a genus of plesiosaur, named by Welles in 1943. Description ''Thalassomedon'' is among the largest elasmosaurids, with the holotype measuring long and weighing more than . There is a larger skull, however, suggesting a much larger animal, potentially up to .Smith, Elliott Armour. (2020). "Revision of the Genus Styxosaurus and Relationships of the Late Cretaceous Elasmosaurids (Sauropterygia: Plesiosauria) of the Western Interior Seaway". Theses, Dissertations and Capstones. 1335. https://mds.marshall.edu/etd/1335 The neck is also very long; it comprises 62 vertebraeCarpenter, K. (1999). "Revision of North American elasmosaurs from the Cretaceous western interior." ''Paludicola'', 2(2): 148-173. and is about - over half of the total length. The skull is long, with long teeth. The flippers were about long. Stones have been found in its stomach area leading some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
