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Inoceramus
''Inoceramus'' (Greek: translation "strong pot") is an extinct genus of fossil marine pteriomorphian bivalves that superficially resembled the related winged pearly oysters of the extant genus '' Pteria''. They lived from the Early Jurassic to latest Cretaceous.''Inoceramus'' at .orgWard ''et al.'' "Ammonite and inoceramid bivalve extinction patterns in Cretaceous/Tertiary boundary sections of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inoceramus Steenstrup, World's Largest Fossil Mollusk
''Inoceramus'' (Greek: translation "strong pot") is an extinct genus of fossil marine pteriomorphian bivalves that superficially resembled the related winged pearly oysters of the extant genus '' Pteria''. They lived from the Early Jurassic to latest Cretaceous.''Inoceramus'' at .orgWard ''et al.'' "Ammonite and inoceramid bivalve extinction patterns in Cretaceous/Tertiary boundary sections of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inoceramus Cuvieri
''Inoceramus cuvieri'' is an extinct species of the extinct genus ''Inoceramus'' of Bivalve mollusks that serves as an index fossil of chalky rocks of Turonian age of the Cretaceous Period in Europe and North America. Description ''Inoceramus cuvieri'' are commonly found as brown shells, usually with some shine. Immature ''I. cuvieri'' are not as flat as other shells in the same rock, having a high hump for its umbo, and having much thinner growth lines. Immature thin shells appear as fragile as other bivalves found in the same rocks. Mature ''I. cuvieri'' are flat and can be around 1 meter in size, leaving much thicker shells. Environment ''Inoceramus cuvieri'' lived in shallow, temperate, normal-salinity inland seaways where the bottom was calcareous mud, corresponding to the maximum depth and width of the Greenhorn sequence of the Western Interior Seaway. The depths of as much as were far enough from shore for clear water and slow sedimentation, and the bottom deep enough ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Western Interior Seaway
The Western Interior Seaway (also called the Cretaceous Seaway, the Niobraran Sea, the North American Inland Sea, and the Western Interior Sea) was a large inland sea that split the continent of North America into two landmasses. The ancient sea, which existed from the early Late Cretaceous (100 million years ago) to the earliest Paleocene (66 Ma), connected the Gulf of Mexico, through the United States and Canada, to the Arctic Ocean. The two land masses it created were Laramidia to the west and Appalachia to the east. At its largest extent, it was deep, wide and over long. Origin and geology By Late-Cretaceous times, Eurasia and the Americas had separated along the south Atlantic, and subduction on the west coast of the Americas had commenced, resulting in the Laramide orogeny, the early phase of growth of the modern Rocky Mountains. The Western Interior Seaway may be seen as a downwarping of the continental crust ahead of the growing Laramide/Rockies mountain chain. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuussuaq Peninsula
Nuussuaq Peninsula (, old spelling: ''Nûgssuaq'') is a large (180x48 km) peninsula in western Greenland. Geography The waters around the peninsula are that of Baffin Bay. To the south and southwest the peninsula is bounded by Disko Bay, an inlet of Baffin Bay. It is separated from Qeqertarsuaq Island by Sullorsuaq Strait which connects Disko Bay with Baffin Bay. To the northeast, it is bounded by the Uummannaq Fjord system. The peninsula is mountainous, with the highest summit reaching 2,144 m.Nuussuaq, Saga Map, Tage Schjøtt, 1992 The spinal range splits in two to the northwest of the base of the peninsula, with the southern arm forming the coastal range, the central arm almost entirely glaciated, and continuing northwest the entire length of the peninsula. The two arms are dissected by a deep Kuussuaq Valley, partially filled in the center with Sarqap Tassersuaq, a glacial, emerald lake. History Archaeological excavations in Qilakitsoq on the southwestern shore ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology Of London
The geology of London comprises various differing layers of sedimentary rock upon which London, England is built. Oldest rocks The oldest rocks proved through boreholes to exist below London are the old, hard rocks of the Palaeozoic. These consist of Silurian mudstones and sandstones, generally overlain by Devonian strata which are largely of Old Red Sandstone. The Devonian rocks are absent in parts of South London. The Palaeozoic rocks dip southwards and are more than 1,000 metres below the English Channel. Above this is a 60-metre thick layer of impermeable Gault clays. These clays are relatively young, only going back to the early Cretaceous which began around 144 million years ago. On top of these clays is a non-contiguous layer of Upper Greensand above which lies a rolling bed of white chalk about 200 metres thick. In the Lower Chalk and in the lower region of the Middle Chalk there are abundant fossilized shell fragments, especially ''Inoceramus'' clams. In places these form ... [...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 700 feet (210m) 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 correla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Platyceramus
''Platyceramus'' was a genus of Cretaceous bivalve molluscs belonging to the extinct inoceramid lineage. It is sometimes classified as a subgenus of ''Inoceramus''. Size The largest and best known species is ''P. platinus''. Individuals of this species typically reached or more in axial length, but some exceptional specimens long have been found,Journal of Paleontology , Jan., 2007, Vol. 81, No. 1 (Jan., 2007), pp. 64-81 making it the largest known bivalve. Its huge but very thin shell often provided shelter for schools of small fish, some of which became trapped and fossilised themselves. The outer shell often provided habitat for its own juveniles, also for oysters such as the epizoic oyster ''Pseudoperna congesta'', and barnacle A barnacle is a type of arthropod constituting the subclass Cirripedia in the subphylum Crustacea, and is hence related to crabs and lobsters. Barnacles are exclusively marine, and tend to live in shallow and tidal waters, typically in eros ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ogallala Opaline Sandstone With Cremnoceramus Deformis Fragments 20201115 143032
Ogallala may refer to: *Ogallala, Nebraska *Ogallala Aquifer * Ogallala Commons * Ogallala Formation *Oglala Lakota The Oglala (pronounced , meaning "to scatter one's own" in Lakota language) are one of the seven subtribes of the Lakota people who, along with the Dakota, make up the Očhéthi Šakówiŋ (Seven Council Fires). A majority of the Oglala live o ... (Sioux) {{geodis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gault Clay
The Gault Formation is a geological formation of stiff blue clay deposited in a calm, fairly deep-water marine environment during the Lower Cretaceous Period (Upper and Middle Albian). It is well exposed in the coastal cliffs at Copt Point in Folkestone, Kent, England, where it overlays the Lower Greensand formation, and underlies the Upper Greensand Formation. These represent different facies, with the sandier parts probably being deposited close to the shore and the clay in quieter water further from the source of sediment; both are believed to be shallow-water deposits. The etymology of the name is uncertain and probably of local origin. Distribution It is found in exposure on the south side of the North Downs and the north side of the South Downs. It is also to be found beneath the scarp of the Berkshire Downs, in the Vale of White Horse, in Oxfordshire, England, and on the Isle of Wight where it is known as Blue Slipper. Gault underlies the chalk beneath the Londo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jurassic
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 Juras ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Map Of North America With The Western Interior Seaway During The Campanian (Upper Cretaceous)
A map is a symbolic depiction emphasizing relationships between elements of some space, such as objects, regions, or themes. Many maps are static, fixed to paper or some other durable medium, while others are dynamic or interactive. Although most commonly used to depict geography, maps may represent any space, real or fictional, without regard to context or scale, such as in brain mapping, DNA mapping, or computer network topology mapping. The space being mapped may be two dimensional, such as the surface of the earth, three dimensional, such as the interior of the earth, or even more abstract spaces of any dimension, such as arise in modeling phenomena having many independent variables. Although the earliest maps known are of the heavens, geographic maps of territory have a very long tradition and exist from ancient times. The word "map" comes from the , wherein ''mappa'' meant 'napkin' or 'cloth' and ''mundi'' 'the world'. Thus, "map" became a shortened term referrin ... [...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 outcrop 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 colu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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