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Liparoceratidae
Liparoceratidae is a family of eoderoceratoidean ammonites from the Lower Jurassic that combines genera with a variety of forms including dimorphs that change from one form to another during ontogeny. Three genera and six subgenera are included in the Liparoceridae according to D.T. Donovan in Donovan ''et al.'' 1981; '' Liparoceras'' including ''L''. (''Liparoceras''), ''L''. (''Becheiceras''), and ''L''. (''Vicininodiceras''); '' Aegoceras'' including ''A''. (''Aegoceras''), ''A''. (''Beaniceras''), and ''A''. (''Oistoceras''); and '' Androgynoceras''. Arkell, ''et al.'' (1957) in the Treatise on Invertebrate Paleontology, Part L list ''Liparoceras'' with ''Becheiceras'' and ''Vincininodiceras'' along with '' Parinodiceras'' separately as subgenera; ''Beaniceras'', '' Metacymbites'', ''Oistoceras'', and '' Platynoticeras'' but leave out ''Aegoceras''. ''Parinodiceras'' and its equivalent, '' Platynoticeras'' are removed (Donovan 1981) to the Polymorphitidae. ''Metacymbites'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eoderoceratoidea
Eoderoceratoidea is a superfamily of true ammonites (suborder Ammonitina) from the Lower Jurassic, comprising seven phylogenetically related families, characterized in general by having ribbed evolute shells that commonly bear spines or tubercles. Adult shell size ranges from 2 or 3 cm to giants reaching 50 cm in such genera as ''Apoderoceras'', ''Epideroceras'', and ''Liparoceras''.Donovan,D.T., Callomon and Howarth 1981. Classification of the Jurassic Ammonitina; Systematics Association. Arkell ''et al.'', 1957. Mesozoic Ammonoidea, in Treatise on Invertebrate Paleontology, (Part L); Geological Soc. of America and University of Kansas press The earliest known eodoceroceratoidean is the eoderoceratid genus ''Microderoceras''. Although its origin is uncertain, it is likely that it is derived from the Psiloceratoidea. It has also been proposed, with some imagination, that ''Microderoceas'' has its origin some earlier Jurassic Lytoceratina, lytoceratid such as ''Analy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aegoceras
''Aegoceras'' is an evolutionary wound ammonite, with wide spaced ribs, from the Early Jurassic (England) included in the Liparoceratidae and superfamily Eoderoceratidae Eoderoceratidae is the ancestral and most primitive family of the Eoderoceratoidea; lower Jurassic ammonite cephalopods, characterized by evolute, commonly serpenticonic, shells that had long body chambers and would have had no stable floating .... Related genera are '' Leparoceras'' and '' Beaniceras''. References ;Notes ;WeblinksAegoceras* Donovan, Callomon and Howarth 1981. Classification of the Jurassic Ammonitina ;Bibliography * M. K. Howarth. 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea. Treatise Online 57:1-139 Early Jurassic ammonites of Europe Hasle Formation Liparoceratidae Ammonitida genera {{Ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Androgynoceras
''Androgynoceras'' is an extinct genus of cephalopod belonging to the ammonite Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family N ... subclass. The Green Ammonite Beds of the Dorset Coast are named after ''Androgynoceras lataecosta'' which has chambers filled with green calcite.Davies, G. M. 1964. ''The Dorset Coast: A Geological Guide''. Northampton: John Dickens and co. Ltd. Distribution Jurassic of Austria, France, Germany, Serbia and Montenegro, Spain, Switzerland and the United Kingdom References External links GBIF Jurassic ammonites of Europe Liparoceratidae Ammonitida genera Fossils of Serbia {{ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liparoceras
''Liparoceras'' is an extinct fossil ammonite genus from the Early Jurassic period of England, and is found in lower Lias deposits. Its name means 'fat head' and this is due to its broad shell. The venter is wide and finely ribbed with no keel and it has two rows of tubercules on each whorl A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs). In nature File:Photograph and axial plane floral diagra .... Distribution Jurassic deposits of Argentina, Europe, British Columbia and North Africa. References *Arkell ''et al.'', 1957. Mesozoic Ammonoidea, in Treatise on Invertebrate Paleontology, (Part L); Geological Soc. of America and University of Kansas press. External links ''Liparoceras'' at fossilmuseum.net Ammonitida genera Liparoceratidae Jurassic ammonites Fossils of Great Britain Pliensbachian life {{Ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amaltheidae
Amaltheidae is a family of eoderoceratoidean ammonitids from the Lower Jurassic consisting of genera characterised by stigated discoidal oxycones—narrow involute shells with narrowly rounded to angular venters that bear a series of grooves, or ridges, along broad flanks, which according to the Treatise on Invertebrate Paleontology, Treatise L, 1957, evolved into strongly ribbed planulates (discoidal evolute shells) with quadrate whorls, typically with crenulated keels; involving all together four genera. Donovan in Donovan ''et al.'' (1981) retains the Amaltheidae in the sense of Arkell, ''et al.'' 1957, as shown in the Treatise on Invertebrate Paleontology, Treatise but synonymizes ''Pseudoamaltheus'' with ''Amaltheus'', (a subgenus in the Treatise), reducing the number of valid genera to three. These are ''Amaltheus'', ''Amauroceras'', and ''Pleuroceras (ammonite), Pleuroceras''. ''Amaltheus'' is oxyconic, keeled, strigated, and ribbed on the outer flanks. ''Amauroceras'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lyme Regis
Lyme Regis ( ) is a town in west Dorset, England, west of Dorchester, Dorset, Dorchester and east of Exeter. Sometimes dubbed the "Pearl of Dorset", it lies by the English Channel at the Dorset–Devon border. It has noted fossils in cliffs and beaches on the Jurassic Coast, a World Heritage Site and heritage coast. The harbour wall, known as The Cobb, appears in Jane Austen's novel Persuasion (novel), ''Persuasion'', the John Fowles novel ''The French Lieutenant's Woman'' and the 1981 The French Lieutenant's Woman (film), film of that name, partly shot in the town. A former mayor and MP was Admiral Sir George Somers, who founded the English colonial settlement of Somers Isles, now Bermuda, where Lyme Regis is twinned with St. George's, Bermuda, St George's. In July 2015, Lyme Regis joined Jamestown, Virginia in a Historic Atlantic Triangle with St George's. The 2011 United Kingdom census, 2011 census gave the urban area a population of 4,712, estimated at 4,805 in 2019. Histor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coeloceratidae
Coeloceratidae is a family of ammonites belonging to the Eoderoceratoidea that lived during the Early Jurassic. Shells are evolute, tending to be broadly discoidal with depressed whorls bearing primary and secondary ribs that branch from outer lateral tubercles. Most of the included species have coronate inner whorls and outer tubercles only. In general, Coeloceratids resemble the Middle Jurassic '' Stephanoceras''. Once regarded as the subfamily Coeloceratinae in the Eoderoceratidae, these ammonites are now given familial rank. Genera included in the Coeloceratidae are '' Coeloceras'', ''Apoderoceras'' '' Coeloderoceras'', '' Hyperderoceras'', '' Pimalites'', '' Praesphaeroceras'', and '' Tetraspidoceras''. ''Tetraspidoceras'', which is bituberculate, is a possible ancestral member of the family. The Coeloceratidae give rise to the Dactylioceratidae References * Arkell ''et al.'', 1957. Mesozoic Ammonoidea, in Treatise on Invertebrate Paleontology The ''Treatise on In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonitida Families
Ammonitida, or true ammonites, are an order of ammonoid cephalopods that lived from the Jurassic through Paleocene time periods, commonly with intricate ammonitic sutures. Ammonitida is divided into four suborders, the Phylloceratina, Lytoceratina, Ancyloceratina, and Ammonitina. The Phylloceratina is the ancestral stock, derived from the Ceratitida near the end of the Triassic. The Phylloceratina gave rise to the Lytoceratina near the beginning of the Jurassic which in turn gave rise to the highly specialized Ancyloceratina near the end of the Jurassic. Both the Phylloceratina and Lytoceratina gave rise to various stocks combined in the Ammonitina. These four suborders are further divided into different stocks, comprising various families combined into superfamilies. Some like the Hildoceratoidea and Stephanoceratoidea are restricted to the Jurassic. Others like the Hoplitoidea and Acanthoceratoidea are known only from the Cretaceous. Still others like the Perisphincto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pliensbachian
The Pliensbachian is an age of the geologic timescale and stage in the stratigraphic column. It is part of the Early or Lower Jurassic Epoch or Series and spans the time between 192.9 ±0.3 Ma and 184.2 ±0.3 Ma (million years ago). The Pliensbachian is preceded by the Sinemurian and followed by the Toarcian. The Pliensbachian ended with the extinction event called the Toarcian turnover. During the Pliensbachian, the middle part of the Lias was deposited in Europe. The Pliensbachian is roughly coeval with the Charmouthian regional stage of North America. Stratigraphic definitions The Pliensbachian takes its name from the hamlet of Pliensbach in the community of Zell unter Aichelberg in the Swabian Alb, some 30 km east of Stuttgart in Germany. The name was introduced into scientific literature by German palaeontologist Albert Oppel in 1858. The base of the Pliensbachian is at the first appearances of the ammonite species '' Bifericeras donovani'' and genera '' Apo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sinemurian
In the geologic timescale, the Sinemurian is an age (geology), age and stage (stratigraphy), stage in the Early Jurassic, Early or Lower Jurassic epoch (geology), Epoch or series (stratigraphy), Series. It spans the time between 199.5 ±0.3 annum, Ma and 192.9 ±0.3 Ma (million years ago). The Sinemurian is preceded by the Hettangian and is followed by the Pliensbachian. In Europe the Sinemurian age, together with the Hettangian age, saw the deposition of the lower Lias Group, Lias, in Great Britain known as the Blue Lias. Stratigraphic definitions The Sinemurian Stage was defined and introduced into scientific literature by French palaeontologist Alcide d'Orbigny in 1842. It takes its name from the French town of Semur-en-Auxois, near Dijon. The calcareous soil formed from the Jurassic limestone of the region is in part responsible for the character of the classic Sancerre (wine), Sancerre wines. The base of the Sinemurian Stage is at the first appearance of the ammonite genu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
