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Bactrosaurus
''Bactrosaurus'' (; meaning "Club lizard," "baktron" = club + ''sauros'' = lizard) is a genus of herbivorous hadrosauroid dinosaur that lived in Asia during the Late Cretaceous, about 96-85 million years ago. The position ''Bactrosaurus'' occupies in the Cretaceous makes it one of the earliest known hadrosauroids, and although it is not known from a full skeleton, ''Bactrosaurus'' is one of the best known of these early hadrosauroids, making its discovery a significant finding. Discovery The first ''Bactrosaurus'' remains recovered from the Iren Dabasu Formation in the Gobi Desert of China were composed of partial skeletons of six individual ''B. johnsoni''. The specimens collected appear to come from a variety of age groups, from individuals that may be hatchlings to full-sized adults. The fossils were described in 1933 by Charles W. Gilmore, who named the new animal ''Bactrosaurus'', or "club lizard", in reference to the large club-shaped neural spines projecting from some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bactrosaurus Museum Of Ancient Life
''Bactrosaurus'' (; meaning "Club lizard," "baktron" = club + ''sauros'' = lizard) is a genus of herbivorous hadrosauroid dinosaur that lived in Asia during the Late Cretaceous, about 96-85 million years ago. The position ''Bactrosaurus'' occupies in the Cretaceous makes it one of the earliest known hadrosauroids, and although it is not known from a full skeleton, ''Bactrosaurus'' is one of the best known of these early hadrosauroids, making its discovery a significant finding. Discovery The first ''Bactrosaurus'' remains recovered from the Iren Dabasu Formation in the Gobi Desert of China were composed of partial skeletons of six individual ''B. johnsoni''. The specimens collected appear to come from a variety of age groups, from individuals that may be hatchlings to full-sized adults. The fossils were described in 1933 by Charles W. Gilmore, who named the new animal ''Bactrosaurus'', or "club lizard", in reference to the large club-shaped neural spines projecting from som ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bactrosaurus
''Bactrosaurus'' (; meaning "Club lizard," "baktron" = club + ''sauros'' = lizard) is a genus of herbivorous hadrosauroid dinosaur that lived in Asia during the Late Cretaceous, about 96-85 million years ago. The position ''Bactrosaurus'' occupies in the Cretaceous makes it one of the earliest known hadrosauroids, and although it is not known from a full skeleton, ''Bactrosaurus'' is one of the best known of these early hadrosauroids, making its discovery a significant finding. Discovery The first ''Bactrosaurus'' remains recovered from the Iren Dabasu Formation in the Gobi Desert of China were composed of partial skeletons of six individual ''B. johnsoni''. The specimens collected appear to come from a variety of age groups, from individuals that may be hatchlings to full-sized adults. The fossils were described in 1933 by Charles W. Gilmore, who named the new animal ''Bactrosaurus'', or "club lizard", in reference to the large club-shaped neural spines projecting from some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hadrosauromorph
Hadrosauromorpha is a clade of iguanodontian ornithopods, defined in 2014 by David B. Norman to divide Hadrosauroidea into the basal taxa with compressed manual bones and a pollex, and the derived taxa that lack them. The clade is defined as all the taxa closer to ''Edmontosaurus regalis'' than '' Probactrosaurus gobiensis''. This results in different taxon inclusion depending on the analysis. Classification Hadrosauromorpha was first used in literature by David B. Norman in 2014 in a discussion of phylogenetics of ''Hypselospinus''. In his 2014 paper Norman references another of his publications as the authority for Hadrosauromorpha, a chapter in the book ''Hadrosaurs''. However, the book was in fact published later, in 2015. Following Article 19.4 of the PhyloCode, the authorship of the clade is thus Norman (2015), while the authorship of the definition is Norman (2014). Definition Hadrosauromorpha was defined by Norman (2014 and 2015) as hadrosauroid taxa closer to ''Edmo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hadrosauroid
Hadrosauroidea is a clade or superfamily of ornithischian dinosaurs that includes the "duck-billed" dinosaurs, or hadrosaurids, and all dinosaurs more closely related to them than to ''Iguanodon''. Their remains have been recovered in Asia, Europe, Africa and the Americas. Many primitive hadrosauroids, such as the Asian '' Probactrosaurus'' and '' Altirhinus'', have traditionally been included in a paraphyletic (unnatural grouping) "Iguanodontidae". With cladistic analysis, the traditional Iguanodontidae has been largely disbanded, and probably includes only ''Iguanodon'' and perhaps its closest relatives. Classification The cladogram below follows an analysis by Andrew McDonald, 2012, and shows the position of Hadrosauroidea within Styracosterna. The cladogram below follows an analysis by Wu Wenhao and Pascal Godefroit (2012). Cladogram after Prieto-Marquez and Norell (2010). A phylogenetic analysis performed by Ramírez-Velasco ''et al.'' (2012) found a large polytom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iren Dabasu Formation
The Iren Dabasu Formation (also known as Erlian Formation) is a Late Cretaceous geologic formation in the Iren Nor region of Inner Mongolia. Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation. The formation was first described and defined by Henry Fairfield Osborn in 1922 and it is located in the Iren Nor region of China. Geology It comprises continental clastic sediments consisting of light grey fine sandstones, coarse sandstones and glutenites as well as mottled claystones and siltstones. The fine-grained floodplain sediments and the coarse-grained sediments of the point bar formed a series of repeated frequently binary sedimentary rhythms. The “binary structure” of the sedimentary rhythms strongly indicates meandering stream deposits rather than braided river deposits as previously thought. As indicated by the fluvial and lacustrine sedimentation, the Iren Dabasu Formation was a large floodplain terrain with br ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hadrosauroidea
Hadrosauroidea is a clade or superfamily of ornithischian dinosaurs that includes the "duck-billed" dinosaurs, or hadrosaurids, and all dinosaurs more closely related to them than to ''Iguanodon''. Their remains have been recovered in Asia, Europe, Africa and the Americas. Many primitive hadrosauroids, such as the Asian '' Probactrosaurus'' and '' Altirhinus'', have traditionally been included in a paraphyletic (unnatural grouping) " Iguanodontidae". With cladistic analysis, the traditional Iguanodontidae has been largely disbanded, and probably includes only ''Iguanodon'' and perhaps its closest relatives. Classification The cladogram below follows an analysis by Andrew McDonald, 2012, and shows the position of Hadrosauroidea within Styracosterna. The cladogram below follows an analysis by Wu Wenhao and Pascal Godefroit (2012). Cladogram after Prieto-Marquez and Norell (2010). A phylogenetic analysis performed by Ramírez-Velasco ''et al.'' (2012) found a large polytomy b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lambeosaurus
''Lambeosaurus'' ( , meaning " Lambe's lizard") is a genus of hadrosaurid dinosaur that lived about 75 million years ago, in the Late Cretaceous period (Campanian stage) of North America. This bipedal/quadrupedal, herbivorous dinosaur is known for its distinctive hollow cranial crest, which in the best-known species resembled a mitten. Several possible species have been named, from Canada, the United States, and Mexico, but only the two Canadian species are currently recognized as valid. Material relevant to the genus was first named by Lawrence Lambe in 1902. Over twenty years later, the modern name was coined in 1923 by William Parks, in honour of Lambe, based on better preserved specimens. The genus has a complicated taxonomic history, in part because small-bodied crested hadrosaurids now recognized as juveniles were once thought to belong to their own genera and species. Currently, the various skulls assigned to the type species ''L. lambei'' are interpreted as showi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cionodon
''Cionodon'' (meaning 'column tooth') is a dubious genus of hadrosauridJ. R. Horner, D. B. Weishampel, and C. A. Forster. 2004. Hadrosauridae. In D. B. Weishampel, H. Osmolska, and P. Dodson (eds.), ''The Dinosauria'' (2nd edition). ''University of California Press, Berkeley'' 438-463 dinosaur from the Late Cretaceous. The type species, ''C. arctatus'', was found in the Denver Formation of Lodge Pole Creek, Colorado and was formally described by Edward Drinker Cope in 1874 based on the holotype AMNH 3951, collected in 1873. It is a '' nomen dubium'' because it is based on very fragmentary remains. Two other species have since been described: ''Cionodon kysylkumensis'' ( Riabinin, 1931), based on the holotype CCMGE 1/3760 (a set of vertebrae) from Uzbekistan,A. N. Riabinin. 1931. Ostatki dinozavrov iz verkhnego mela nizov'ev r. Amu-Dar'i Amu-Daria River">Amu_Darya.html" ;"title="n the dinosaurian remains from the Upper Cretaceous of the lower parts of the Amu Darya">Amu-Daria ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Majiacun Formation
The Majiacun Formation is a Santonian to Coniacian geologic Formation (geology), formation in China. * ''Zhanghenglong, Zhanghenglong yangchengensis''Xing et al., 2014 * Baryonychinae, Baryonychinae indet.? (possibly an indeterminate theropod due to no shared synapomorphies present)Hone et al., 2010 ;Fossil eggs * ''Dendroolithus, Dendroolithus sanlimiaoensis''Zhou & Feng, 2002 * ''Prismatoolithus gebiensis''Liang et al., 2009 * ''Ovaloolithus, Ovaloolithus sp.'' * ''Spheroolithus, Spheroolithus sp.''Zhao, 1979 * ''Nanyangosaurus, Nanyangosaurus zhugeii'' * ''Youngoolithus, Youngoolithus xiaguanensis'' ;Ichnofossils * ''Scoyenia, Scoyenia sp.'' See also * List of dinosaur-bearing rock formations ** List of stratigraphic units with few dinosaur genera References Bibliography * * * * * * * * * {{cite LSA , last=Zhao , first=Z , year=1979 , title=Discovery of the dinosaurian eggs and footprint from Neixiang county, Henan province , journ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lambeosaurine
Lambeosaurinae is a group of crested hadrosaurid dinosaurs. Classification Lambeosaurines have been traditionally split into the tribes or clades Parasaurolophini ('' Parasaurolophus'', ''Charonosaurus'', others (?).) and Lambeosaurini (''Corythosaurus'', ''Hypacrosaurus'', ''Lambeosaurus'', others.). Corythosaurini (synonym of Lambeosaurini, see below) and Parasaurolophini as terms entered the formal literature in Evans and Reisz's 2007 redescription of ''Lambeosaurus magnicristatus''. Corythosaurini was defined as all taxa more closely related to ''Corythosaurus casuarius'' than to ''Parasaurolophus walkeri'', and Parasaurolophini as all those taxa closer to ''P. walkeri'' than to ''C. casuarius''. In this study, ''Charonosaurus'' and ''Parasaurolophus'' are parasaurolophins, and ''Corythosaurus'', ''Hypacrosaurus'', ''Lambeosaurus'', ''Nipponosaurus'', and ''Olorotitan'' are corythosaurins. However, later researchers pointed out that due to the rules of priority set forth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iguanodont
Iguanodontia (the iguanodonts) is a clade of herbivorous dinosaurs that lived from the Middle Jurassic to Late Cretaceous. Some members include ''Camptosaurus'', ''Dryosaurus'', ''Iguanodon'', '' Tenontosaurus'', and the hadrosaurids or "duck-billed dinosaurs". Iguanodontians were one of the first groups of dinosaurs to be found. They are among the best known of the dinosaurs, and were among the most diverse and widespread herbivorous dinosaur groups of the Cretaceous period. Classification Iguanodontia is often listed as an infraorder within a suborder Ornithopoda, though Benton (2004) lists Ornithopoda as an infraorder and does not rank Iguanodontia. Traditionally, iguanodontians were grouped into the superfamily Iguanodontoidea and family Iguanodontidae. However, phylogenetic studies show that the traditional "iguanodontids" are a paraphyletic grade leading up to the hadrosaurs (duck-billed dinosaurs). Groups like Iguanodontoidea are sometimes still used as unranked clades ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Late Cretaceous
The Late Cretaceous (100.5–66 Ma) is the younger 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, Australia an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
