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Westbury Formation
The Westbury Formation is a geological formation in England, one of the Penarth Group. It dates back to the Rhaetian.Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Triassic, Europe)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 521–525. . The formation is named after the village of Westbury-on-Severn in Gloucestershire. The remains of giant shastasaurids are known from the formation. Vertebrate fauna *''Avalonianus'' *'' Picrodon'' *Shastasauridae indet. See also * List of dinosaur-bearing rock formations This list of dinosaur-bearing rock formations is a list of geologic formations in which dinosaur fossils have been documented. Containing body fossils * List of stratigraphic units with dinosaur body fossils ** List of stratigraphic units with ... References {{Reflist Triassic System of Europe Rhaetian Stage Geologic formations of England ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Formation
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by Abraham Gottlob Wer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formation (geology)
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by Abraham Gottlob Wer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triassic System Of Europe
The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period of the Mesozoic Era. Both the start and end of the period are marked by major extinction events. The Triassic Period is subdivided into three epochs: Early Triassic, Middle Triassic and Late Triassic. The Triassic began in the wake of the Permian–Triassic extinction event, which left the Earth's biosphere impoverished; it was well into the middle of the Triassic before life recovered its former diversity. Three categories of organisms can be distinguished in the Triassic record: survivors from the extinction event, new groups that flourished briefly, and other new groups that went on to dominate the Mesozoic Era. Reptiles, especially archosaurs, were the chief terrestrial vertebrates during this time. A specialized subgroup of archo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Dinosaur-bearing Rock Formations
This list of dinosaur-bearing rock formations is a list of geologic formations in which dinosaur fossils have been documented. Containing body fossils * List of stratigraphic units with dinosaur body fossils ** List of stratigraphic units with few dinosaur genera ** List of stratigraphic units with indeterminate dinosaur fossils Containing trace fossils * List of stratigraphic units with dinosaur trace fossils ** List of stratigraphic units with dinosaur tracks *** List of stratigraphic units with ornithischian tracks *** List of stratigraphic units with sauropodomorph tracks *** List of stratigraphic units with theropod tracks See also * Lists of fossiliferous stratigraphic units * List of fossil sites * Mesozoic The Mesozoic Era ( ), also called the Age of Reptiles, the Age of Conifers, and colloquially as the Age of the Dinosaurs is the second-to-last era of Earth's geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceo ... {{DEFAULTSOR ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Camelotia
''Camelotia'' (meaning "from Camelot") is a genus of sauropodomorph dinosaur from the Late Triassic or Early Jurassic in what is now England. Paleontologists are divided on which family it may belong to; in the past, ''Camelotia'' has generally been assigned to the prosauropods, but this group of primitive dinosaurs is in constant flux. The genus is now considered a member of the family Melanorosauridae, which includes the first true giant herbivorous dinosaurs.Galton, P. M. (1985). Notes on the Melanorosauridae, a family of large prosauropod dinosaurs (Saurischia: Sauropodomorpha). Geobios, 18(5), 671-676. Discovery and species The type specimens, syntypes SAM 3449 and SAM 3450, were described and named in 1985 by Galton. They were collected from the Triassic-Jurassic Westbury Formation, dating to the latest Rhaetian-Lowermost Hettangian. The fossils includes the specimens "BMNH R2870-R2874", "R2876-R2878" (holotype), with vertebrae, ribs, and parts of the pubis, isch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vertebrate
Vertebrates () comprise all animal taxa within the subphylum Vertebrata () ( chordates with backbones), including all mammals, birds, reptiles, amphibians, and fish. Vertebrates represent the overwhelming majority of the phylum Chordata, with currently about 69,963 species described. Vertebrates comprise such groups as the following: * jawless fish, which include hagfish and lampreys * jawed vertebrates, which include: ** cartilaginous fish (sharks, rays, and ratfish) ** bony vertebrates, which include: *** ray-fins (the majority of living bony fish) *** lobe-fins, which include: **** coelacanths and lungfish **** tetrapods (limbed vertebrates) Extant vertebrates range in size from the frog species ''Paedophryne amauensis'', at as little as , to the blue whale, at up to . Vertebrates make up less than five percent of all described animal species; the rest are invertebrates, which lack vertebral columns. The vertebrates traditionally include the hagfish, which do no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Picrodon
''Picrodon'' is the name given to a genus of archosaur, possibly a sauropodomorph dinosaur, from the Rhaetian of England which was possibly synonymous with the dubious archosaur ''Avalonianus''. The type, and only species, ''P. herveyi'', was named in 1898.H. G. Seeley. 1898. On large terrestrial saurians from the Rhaetic Beds of Wedmore Hill, described as '' Avalonia sanfordi'' and ''Picrodon herveyi''. Geological Magazine, decade 4 5:1-6 Discovery and naming In 1894, W. A. Sanford described the fossil remains of what he considered to be two large reptiles discovered near Westbury-on-Severn, Glastonbury (Westbury Formation) by Eev. Sydenham H. A. Hervey and Sanford himself.''Proceedings of the Somerset Archaeological Society'' - vol. xl, 1894, p. 234 Harry Govier Seeley described the fossils and named two genera: ''Avalonia'' (preoccupied; now ''Avalonianus'') and ''Picrodon''; both are based solely on teeth. Only a single tooth, holotype BMNH R2875, belonging to ''P. herveyi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Avalonianus
''Avalonianus'' is a highly dubious and possibly invalid genus of archosaur from the Late Triassic of England. It was first described in 1898 by Harry Seeley with the name ''Avalonia'',H. G. Seeley. 1898. On large terrestrial saurians from the Rhaetic Beds of Wedmore Hill, described as ''Avalonia sanfordi'' and '' Picrodon herveyi''. Geological Magazine, decade 4 5:1-6 but that name was preoccupied (Walcott, 1889), so Oskar Kuhn renamed it in 1961, albeit with no epithet (although Seeley added the epithet ''sanfordi'' in 1898). It was thought to be a prosauropod, but later analysis revealed it was actually a chimera, with the original teeth coming from a non-dinosaurian ornithosuchian (or possibly an early theropod Theropoda (; ), whose members are known as theropods, is a dinosaur clade that is characterized by hollow bones and three toes and claws on each limb. Theropods are generally classed as a group of saurischian dinosaurs. They were ancestrally c ...), and later-refe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shastasauridae
Shastasauridae is an extinct family of Triassic ichthyosaurs that includes the genera '' Shastasaurus'', ''Shonisaurus'' and ''Himalayasaurus''. Many other Triassic ichthyosaurs have been assigned to Shastasauridae in the past, but recent phylogenetic analyses suggest that these species form an evolutionary grade of early ichthyosaurs rather than a true clade or evolutionary grouping that can be called Shastasauridae. Shastasauridae was named by American paleontologist John Campbell Merriam in 1895 along with the newly described genus ''Shastasaurus''. In 1999, Ryosuke Motani erected the clade Shastasauria to include ''Shastasaurus'', ''Shonisaurus'', and several other traditional shastasaurids, defining it as a stem-based taxon including "all merriamosaurians more closely related to '' Shastasaurus pacificus'' than to ''Ichthyosaurus communis''." He also redefined Shastasauridae as a node-based taxon including "the last common ancestor of ''Shastasaurus pacificus'' and '' Besan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gloucestershire
Gloucestershire ( abbreviated Glos) is a county in South West England. The county comprises part of the Cotswold Hills, part of the flat fertile valley of the River Severn and the entire Forest of Dean. The county town is the city of Gloucester and other principal towns and villages include Cheltenham, Cirencester, Kingswood, Bradley Stoke, Stroud, Thornbury, Yate, Tewkesbury, Bishop's Cleeve, Churchdown, Brockworth, Winchcombe, Dursley, Cam, Berkeley, Wotton-under-Edge, Tetbury, Moreton-in-Marsh, Fairford, Lechlade, Northleach, Stow-on-the-Wold, Chipping Campden, Bourton-on-the-Water, Stonehouse, Nailsworth, Minchinhampton, Painswick, Winterbourne, Frampton Cotterell, Coleford, Cinderford, Lydney and Rodborough and Cainscross that are within Stroud's urban area. Gloucestershire borders Herefordshire to the north-west, Worcestershire to the north, Warwickshire to the north-east, Oxfordshire to the east, Wiltshire to the south, Bristol and Somerset ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blue Anchor Formation
The Mercia Mudstone Group is an early Triassic lithostratigraphic group (a sequence of rock strata) which is widespread in Britain, especially in the English Midlands – the name is derived from the ancient kingdom of Mercia which corresponds to that area. It is frequently encountered in older literature as the Keuper Marl or Keuper Marl Series. The Mercia Mudstone Group is now divided into five formations recognised and mappable across its entire outcrop and subcrop. The formations are a mix of mudstones, siltstones, sandstones and halites. Historically this sequence of rocks has been subdivided in different ways with different names in each of the basinal areas in which it is found. Increasing knowledge of the sequences and the more recent development of seamless electronic mapping by the British Geological Survey (BGS) necessitated a reappraisal of these divisions. A report published by BGS in 2008 recommended the abandonment of previous divisions and naming schemes in favour o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhaetian
The Rhaetian is the latest age of the Triassic Period (in geochronology) or the uppermost stage of the Triassic System (in chronostratigraphy). It was preceded by the Norian and succeeded by the Hettangian (the lowermost stage or earliest age of the Jurassic). The base of the Rhaetian lacks a formal GSSP, though candidate sections include Steinbergkogel in Austria (since 2007) and Pignola-Abriola in Italy (since 2016). The end of the Rhaetian (and the base of the overlying Hettangian Stage) is more well-defined. According to the current ICS (International Commission on Stratigraphy) system, the Rhaetian ended ± 0.2 Ma (million years ago). In 2010, the base of the Rhaetian (i.e. the Norian-Rhaetian boundary) was voted to be defined based on the first appearance of '' Misikella posthernsteini'', a marine conodont. However, there is still much debate over the age of this boundary, as well as the evolution of ''M. posthernsteini''. The most comprehensive source of precise age ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
