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Lulworth Formation
The Lulworth Formation is a Formation (geology), geologic formation in England. It dates from the late Tithonian to the mid Berriasian. It is a subunit of the Purbeck Group. In Dorset, it consists of three members, which are in ascending order, the Mupe Member, the Ridgway Member, and the Warbarrow Tout Member. The Mupe Member is typically 11 to 16 m thick and largely consists of marls and micrites with interbeds of calcareous mudstone. The Ridgeway Member is about 3 to 7 m thick and consists of in its western portion carbonaceous muds, marls and micrites, in the east the muds are replaced by micritic limestone. The Warbarrow Tout Member is 17 to 39 m thick and consists of limestone at the base and micrite and mudstone for the rest of the sequence, this member is the primary source of the vertebrate fossils within the formation. Elsewhere the unit is undifferentiated. Vertebrate paleobiota Amphibians Turtles Lepidosaurs Crocodyliformes Dinosaurs Mammals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lulworth Cove
Lulworth Cove is a cove near the village of West Lulworth, on the Jurassic Coast in Dorset, southern England. The cove is one of the world's finest examples of such a landform, and is a World Heritage Site and tourist location with approximately 500,000 visitors every year, of whom about 30 per cent visit in July and August. It is close to the rock arch of Durdle Door and other Jurassic Coast sites. Geology The cove has formed as a result of bands of rock of alternating geological resistance running parallel to the coastline (a concordant coastline). On the seaward side the clays and sands have been eroded. A narrow (less than ) band of Portland limestone rocks forms the shoreline. Behind this is a narrow (less than ) band of slightly less-resistant Purbeck limestone. Behind this are of much less-resistant clays and greensands; Weald Clays, Gault and Upper Greensand. Forming the back of the cove is a band of chalk, which is considerably more resistant than the cl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amphibian
Amphibians are tetrapod, four-limbed and ectothermic vertebrates of the Class (biology), class Amphibia. All living amphibians belong to the group Lissamphibia. They inhabit a wide variety of habitats, with most species living within terrestrial animal, terrestrial, fossorial, arboreal or freshwater aquatic ecosystems. Thus amphibians typically start out as larvae living in water, but some species have developed behavioural adaptations to bypass this. The young generally undergo metamorphosis from larva with gills to an adult air-breathing form with lungs. Amphibians use their skin as a secondary respiratory surface and some small terrestrial salamanders and frogs lack lungs and rely entirely on their skin. They are superficially similar to reptiles like lizards but, along with mammals and birds, reptiles are amniotes and do not require water bodies in which to breed. With their complex reproductive needs and permeable skins, amphibians are often ecological indicators; in re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleurosternon
''Pleurosternon'' is an extinct genus of freshwater pleurosternid turtle from the latest Jurassic to earliest Cretaceous of Europe. Its type species, ''P. bullocki'' was described by the paleontologist Richard Owen (noted for coining the word '' Dinosauria'') in 1853. Since then, and throughout the late 19th century, many fossil turtles were incorrectly assigned to this genus, though only two are currently considered valid. Taxonomy ''Pleurosternon bullocki'' fossils were first described by Richard Owen in 1841 from specimens found in the earliest Cretaceous (Berriasian) aged Purbeck Group of the Isle of Purbeck, of Dorset in southern England, under the living genus ''Platemys''. It was not until 1853 however, that it was published under the name ''Pleurosternon'' in a paper Owen presented to the Palaeontographical Society. ''P. portlandicum'' named by Richard Lydekker in 1889 from the latest Jurassic (Tithonian) aged Portland Stone of the Isle of Portland, Dorset, is now consi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hylaeochelys
''Hylaeochelys'' is an extinct genus of plesiochelyid turtle that lived during the Late Jurassic-Early Cretaceous in Portugal, Spain, France, and southern England. The type species was originally named by Richard Owen as '' Pleurosternon latiscutatum'' in 1853, before being moved to the new genus ''Hylaeochelys'' by Richard Lydekker in 1889. Other species included in the genus are ''H. belli'', ''H. kappa''A. Pérez-García and F. Ortega. 2014. A new species of the turtle Hylaeochelys (Eucryptodira) outside its known geographic and stratigraphic ranges of distribution. Comptes Rendus Palevol 13(3):183-188 and ''H. lata'', originally named under different genera by Gideon Mantell and Owen, respectively. All species are represented by carapaces, primarily from the Lulworth Formation of the Purbeck Limestone Group that was deposited during the Berriasian In the geological timescale, the Berriasian is an age/stage of the Early/Lower Cretaceous. It is the oldest subdivision in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helochelydra
''Helochelydra'' is an extinct genus of extinct stem turtle known from the Early Cretaceous (Barremian) of the Isle of Wight, southern England. Phylogeny ''Helochelydra'' is a member of the stem turtle family Helochelydridae, which is known from Late Jurassic to Late Cretaceous deposits in North America and Europe. Cladistic analysis recovers Helochelydridae outside the clade leading to crown turtles (Testudines).W. G. Joyce, S. D. Chapman, R. T. J. Moody, C. A. Walker (2011) The skull of the solemydid turtle ''Helochelydra nopcsai'' from the Early Cretaceous of the Isle of Wight (UK) and a review of Solemydidae. ''Special Papers in Palaeontology'': 75-97. Taxonomy ''Helochelydra'' was named in 1928 by Franz Baron Nopcsa for a partial shell ( NHMUK R171) from the Early Cretaceous Wessex Formation of the Isle of Wight that Lydekker (1889) had referred to ''Tretosternon punctatum'', a turtle taxon from the Purbeck Group of Dorset, but no species name was provided. Lapparent de Bro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dorsetochelys
''Dorsetochelys'' is an extinct genus of turtle from the Early Cretaceous of southern England and northwestern Germany. Taxonomy The type species, ''Dorsetochelys delairi'', was described on the basis of DORCM G.23, a complete skull from the Early Cretaceous (Berriasian) Purbeck Group of Dorset, England. Later, a turtle skull from the vicinity of Como Bluff, Wyoming, was described as a new species, ''D. buzzops'', in honor of Buzz Pitman, a museum director of the Rock River Museum near Como Bluff. However, a cladistic analysis conducted in 2013 recovered that species as a member of Baenidae, sister to ''Uluops''. In 2012, pleurosternid remains were described from the Early Cretaceous (Berriasian) Bückeberg Formation of Lower Saxony, northwestern Germany, and this prompted a re-assessment of the problematic species ''"Pleurosternon" typocardium'', which had been tentatively referred to ''Glyptops ''Glyptops'' (Greek for "grooved face") is an extinct genus of pleurosternid fre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turtle
Turtles are an order of reptiles known as Testudines, characterized by a special shell developed mainly from their ribs. Modern turtles are divided into two major groups, the Pleurodira (side necked turtles) and Cryptodira (hidden necked turtles), which differ in the way the head retracts. There are 360 living and recently extinct species of turtles, including land-dwelling tortoises and freshwater terrapins. They are found on most continents, some islands and, in the case of sea turtles, much of the ocean. Like other amniotes (reptiles, birds, and mammals) they breathe air and do not lay eggs underwater, although many species live in or around water. Turtle shells are made mostly of bone; the upper part is the domed carapace, while the underside is the flatter plastron or belly-plate. Its outer surface is covered in scales made of keratin, the material of hair, horns, and claws. The carapace bones develop from ribs that grow sideways and develop into broad flat plates th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Batrachosauroididae
Batrachosauroididae is an extinct family of prehistoric salamanders with holarctic distribution. They were paedomorphic and presumably aquatic. They are possibly the sister taxon of Proteidae, an extant family of aquatic salamanders. They are definitively known from the Late Cretaceous to Miocene of North America and Europe. Remains from the earliest Cretaceous (Berriasian) Lulworth Formation of England have tenatively been attributed to this family. The following genera are included: *'' Batrachosauroides'' United States, Eocene-Miocene *''Opisthotriton'' North America, Late Cretaceous-Paleocene *'' Palaeoproteus'' Europe Paleocene-Miocene *'' Parrisia'' United States, Late Cretaceous *'' Peratosauroides'' United States, Miocene *'' Prodesmodon'' North America Late Cretaceous-Paleocene See also * Prehistoric amphibian * List of prehistoric amphibians This list of prehistoric amphibians is an attempt to create a comprehensive listing of all genera from the fossil record that ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Discoglossidae
The Alytidae are a family of primitive frogs. Their common name is painted frogs or midwife toads. Most are endemic to Europe, but three species occur in northwest Africa, and a species formerly thought to be extinct is found in Israel. This family is also known as Discoglossidae, but the older name Alytidae has priority and is now recognized by major reference works. Some researchers, though, suggest that '' Alytes'' and ''Discoglossus'' are different enough to be treated as belonging to separate families, implying resurrection of the Discoglossidae. The term "discoglossid" has also been used to refer to many primitive fossil frogs that share plesiomorphic (ancestral) similities to alytids, but that are probably not closely related. Genera and species The family contains three extant genera, '' Alytes'', ''Discoglossus'', and '' Latonia''. The first is somewhat toad-like and can often be found on land. The second is smoother and more frog-like, preferring the water. The third ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frog
A frog is any member of a diverse and largely Carnivore, carnivorous group of short-bodied, tailless amphibians composing the order (biology), order Anura (ανοὐρά, literally ''without tail'' in Ancient Greek). The oldest fossil "proto-frog" ''Triadobatrachus'' is known from the Early Triassic of Madagascar, but molecular clock, molecular clock dating suggests their split from other amphibians may extend further back to the Permian, 265 Myr, million years ago. Frogs are widely distributed, ranging from the tropics to subarctic regions, but the greatest concentration of species diversity is in tropical rainforest. Frogs account for around 88% of extant amphibian species. They are also one of the five most diverse vertebrate orders. Warty frog species tend to be called toads, but the distinction between frogs and toads is informal, not from Taxonomy (biology), taxonomy or evolutionary history. An adult frog has a stout body, protruding eyes, anteriorly-attached tongue, limb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sunnybatrachus
''Sunnybatrachus'' is a genus of extinct frog that lived during the Berriasian epoch of the Early Cretaceous of England. The only known material, including the holotype ilium as well as bones of the skull, vertebral column, forelimb, pelvis, and hindlimb was named ''Sunnybatrachus purbeckensis'' by Susan E. Evans and Gerard J. McGowan in 2002. The species name describes the Purbeck Limestone Group, while the genus name is for the Sunnydown Farm locality of the Lulworth Formation, where the fossils were found. ''Sunnybatrachus purbeckensis'' is estimated to have a been mid-sized frog, measuring in snout–vent length Snout–vent length (SVL) is a morphometric measurement taken in herpetology from the tip of the snout to the most posterior opening of the cloacal slit (vent)."direct line distance from tip of snout to posterior margin of vent" It is the most c .... References Early Cretaceous frogs Early Cretaceous tetrapods of Europe Fossil taxa described in 2002 Ta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albanerpetontidae
The Albanerpetontidae are an extinct family of small amphibians, native to the Northern Hemisphere during the Mesozoic and Cenozoic. The only members of the order Allocaudata, they are thought to be allied with living amphibians belonging to Lissamphibia. Despite a superficially salamander-like bodyform, their anatomy is strongly divergent from modern amphibians in numerous aspects. The fossil record of albanerpetontids spans over 160 million years from the Middle Jurassic to the beginning of the Pleistocene, about 2.13-2 million years ago. History of Research The earliest specimen of an albanerpetontid to be discovered was that of '' Celtedens megacephalus'' from the Early Cretaceous (Albian) Pietraroja Plattenkalk of Italy, described by Oronzio Gabriele Costa in 1864, and originally placed in the genus ''Triton,'' a junior synonym of the salamander genus ''Triturus''. Jaw elements of albanerpetontids from the Cretaceous of North America were assigned to the salamander g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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