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Marnes A Belemnopsis Latesulcatus Formation
The Marnes a ''Belemnopsis latesulcatus'' Formation is a Jurassic geologic formation in France. It is so named because it exists within the '' Belemnopsis latesulcatus'' biostratigraphic zone. It predominantly consists of bioturbated variegated marl and lenticular concetionary wackestone Vertebrate fauna Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607. A referred specimen of '' Loricatosaurus priscus'' (MHBR 001) was found in this unit and is the source of the name ''Lexovisaurus'' when Hoffstetter (1957) coined that genus for the dubious species ''O. durobrivensis'' (to which he referred MNBR 001), because the area in which MHBR 001 was found used to be inhabited by the Lexovii, a tribe of the ancient Gauls.Hoffstetter, R., 1957, "Quelques observations sur les Stégosaurinés", Bulletin du Muséum National d’Histoire Naturelle, Paris, 2nde série ... [...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] |
Wackestone
Under the Dunham classification (Dunham, 1962Dunham, R.J., 1962. Classification of carbonate rocks according to depositional texture. In: W.E. Ham (Ed.), Classification of Carbonate Rocks. American Association of Petroleum Geologists Memoir. American Association of Petroleum Geologists, Tulsa, Oklahoma, pp. 108–121.) system of limestones, a wackestone is defined as a mud-supported carbonate rock that contains greater than 10% grains. Most recently, this definition has been clarified as ''a carbonate-dominated rock in which the carbonate mud (2 mm)''. The identification of wackestone A study of the adoption and use of carbonate classification systems by Lokier and Al Junaibi (2016) highlighted that the most common problem encountered when describing a wackestone is to incorrectly estimate the volume of 'grains' in the sample – in consequence, misidentifying wackestone as mudstone Mudstone, a type of mudrock, is a fine-grained sedimentary rock whose original constituents ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jurassic System Of Europe
The Jurassic ( ) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The Jurassic constitutes the middle period of the Mesozoic Era and is named after the Jura Mountains, where limestone strata from the period were first identified. The start of the Jurassic was marked by the major Triassic–Jurassic extinction event, associated with the eruption of the Central Atlantic Magmatic Province. The beginning of the Toarcian Stage started around 183 million years ago and is marked by an extinction event associated with widespread oceanic anoxia, ocean acidification, and elevated temperatures likely caused by the eruption of the Karoo-Ferrar large igneous provinces. The end of the Jurassic, however, has no clear boundary with the Cretaceous and is the only boundary between geological periods to remain formally undefined. By the beginning of the Jurassic, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Stratigraphic Units With Few Dinosaur Genera
This list of stratigraphic units with few non-avian dinosaur genera includes Mesozoic stratigraphic units of formation rank or higher that have produced dinosaur body fossils which have been referred to at most five genera. Since taxonomy frequently changes and can be somewhat subjective, the number of reported genera may not coincide exactly with the number of genera extant at the time of deposition. The list 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 ... Footnotes References * Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. . {{DEFAULTSORT:List Of Stratigraphic Units With Few Dinosaur Genera Few dinosaur genera ... [...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] |
Lexovii
The Lexovii (Gaulish: *''Lexsouioi'', 'the leaning, lame'), were a Gallic tribe dwelling immediately west of the mouth of the Seine, around present-day Lisieux, during the Iron Age and the Roman period. Name They are mentioned as ''Lexovii'' (var. ''Lexobii'') and ''Lexovios'' by Caesar (mid-1st c. BC), ''Lēxobíous'' (Ληξοβίους) and ''Lēxooúioi'' (Ληξοούιοι) by Strabo (early 1st c. AD), ''Lexovios'' (var. ''lexobios'', ''lixouios'') by Pliny (1st c. AD), and as ''Lēxoubíōn'' (Ληξουβίων; var. Λειξουβίων) and ''Lēxoúbioi'' (Ληξούβιοι; var. Λιξούβιοι) by Ptolemy (2nd c. AD)., s.v. ''Lexovii.'' The ethnic name ''Lexovii'' is a latinized form of the Gaulish ethnonym *''Lexsouioi'' (sing. ''Lexsouios''), which means 'leaning', possibly 'lame' (cf. Old Irish ''losc'', 'lame'). It is a derivative of the adjective *''leksu''- ('oblique'; cf. Greek λοξός). An exact parallel has been highlighted in the Welsh ''llechwedd'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lexovisaurus
''Lexovisaurus'' is a genus of stegosaur from mid-to-Late Jurassic Europe, 165.7-164.7 mya. Fossils of limb bones and armor fragments have been found in middle to late Jurassic-aged strata of England. Discovery and taxonomy In the early 1880s collector Alfred Nicholson Leeds acquired a skeleton of a dinosaur excavated at a small brick pit at the hamlet of Tanholt, close to Eye, Cambridgeshire. In September 1885 the remains were shown to paleontologist Henry Woodward whose notes form the first documentation on the subject. Later it was mistakenly assumed the find had been made at the industrial brick pits at Fletton, the usual source of Leeds' specimens.Leslie F. Noè, Jeff J. Liston and Sandra D. Chapman, 2010, "‘Old bones, dry subject’: the dinosaurs and pterosaur collected by Alfred Nicholson Leeds of Peterborough, England", ''Geological Society, London, Special Publications'' 343: 49-77 In 1887 the fossil was described by John Whitaker Hulke and named as a new sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Loricatosaurus
''Loricatosaurus'' (meaning "armored lizard") is a Stegosaurid genus from Callovian-age ( Middle Jurassic) rocks of England and France. Discovery and naming ''Loricatosaurus'' is known from remains previously assigned to '' Lexovisaurus'' that were first discovered at the Fletton brick pit in the Oxford Clay Formation, Fletton, Peterborough, England, by Alfred Leeds during November 1901.J. W. Hulke. 1887. Note on some dinosaurian remains in the collection of A. Leeds, Esq. Part I. Ornithopsis leedsii. Part II. Omosaurus, sp. Geological Magazine, decade 3 4:375-376 Leeds collected a semi articulated skeleton consisting of two cervical, six dorsal, and 16 caudal vertebrae, a partial right forelimb, partial left hindlimb, partial pelves, and some fragmentary dermal armor. One piece of armor was described as a parascapular spine, but it is actually a fragmentary tail spine. In 1957, another specimen now referred to ''Loricatosaurus'' was briefly referred to ''Lexovisaurus'' un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus comes above species and below family (taxonomy), family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dinosaur
Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the evolution of dinosaurs is the subject of active research. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201.3 mya; their dominance continued throughout the Jurassic and Cretaceous periods. The fossil record shows that birds are feathered dinosaurs, having evolved from earlier theropods during the Late Jurassic epoch, and are the only dinosaur lineage known to have survived the Cretaceous–Paleogene extinction event approximately 66 mya. Dinosaurs can therefore be divided into avian dinosaurs—birds—and the extinct non-avian dinosaurs, which are all dinosaurs other than birds. Dinosaurs are varied from taxonomic, morphological and ecological standpoints. Birds, at over 10,700 living species, are among ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Concretion
A concretion is a hard, compact mass of matter formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. Concretions are often ovoid or spherical in shape, although irregular shapes also occur. The word 'concretion' is derived from the Latin "(act of) compacting, condensing, congealing, uniting", itself from ''con'' meaning 'together' and ''crescere'' meaning "to grow". Concretions form within layers of sedimentary strata that have already been deposited. They usually form early in the burial history of the sediment, before the rest of the sediment is hardened into rock. This concretionary cement often makes the concretion harder and more resistant to weathering than the host stratum. There is an important distinction to draw between concretions and nodules. Concretions are formed from mineral precipitation around some kind of nucleus while a nodule is a replacement body. Descriptions dating from the 18th ce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marl
Marl is an earthy material rich in carbonate minerals, clays, and silt. When hardened into rock, this becomes marlstone. It is formed in marine or freshwater environments, often through the activities of algae. Marl makes up the lower part of the cliffs of Dover, and the Channel Tunnel follows these marl layers between France and the United Kingdom. Marl is also a common sediment in post-glacial lakes, such as the marl ponds of the northeastern United States. Marl has been used as a soil conditioner and neutralizing agent for acid soil and in the manufacture of cement. Description Marl or marlstone is a carbonate-rich mud or mudstone which contains variable amounts of clays and silt. The term was originally loosely applied to a variety of materials, most of which occur as loose, earthy deposits consisting chiefly of an intimate mixture of clay and calcium carbonate, formed under freshwater conditions. These typically contain 35–65% clay and 65–35% carbonate. The te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
