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Gaudryceratidae
Gaudryceratidae is a family belonging to the extinct Ammonoidea, ammonoid suborder Lytoceratina that lived from the Barremian of the Lower Cretaceous to the Maastrichtian of the Upper Cretaceous. Gaudryceratids are lytocerins typically with rounded, oval, or depressed whorl sections that become higher with age; suture with more or less symmetrical, bifid saddles, internal Ammonitic suture, suture with a single saddle. References * Arkell ''et al.'', Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L. Geological Society of America, 1957. RC. Moore, ed.Gaudryceratidae-Paleobiology Database 9/24/07 Ammonitida families Lytoceratina Barremian first appearances Maastrichtian extinctions {{Ammonitida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kossmatella
''Kossmatella'' is an extinct genus of ammonoid cephalopods belonging to the family Lytoceratidae. These fast-moving nektonic carnivores lived in the Cretaceous period, from Albian age to Cenomanian age. Description Shells of ''Eulytoceras'' species are quite small, with rounded whorl section and deep constrictions on the external surface. Distribution Fossils of species within this genus have been found in the Cretaceous rocks of Dominican Republic, France, Italy, Madagascar, Mexico, South Africa, Suriname and United States. References GBIF* Arkell ''et al.'', Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and co ..., Part L. Geological Society of America, 1957. RC. Moore, ed. Cretaceous ammonites Ammonites of Europe Albi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gaudryceras
''Gaudryceras'' is an ammonite genus belonging to the family Gaudryceratidae. These cephalopods were fast-moving nektonic carnivores. They lived in the Cretaceous period, from Albian to Maastrichtian The Maastrichtian () is, in the ICS geologic timescale, the latest age (uppermost stage) of the Late Cretaceous Epoch or Upper Cretaceous Series, the Cretaceous Period or System, and of the Mesozoic Era or Erathem. It spanned the interval from ... stages (105.3 to 66.043 Ma).Sepkoski, JacSepkoski's Online Genus Database – Cephalopodes/ref> Subgenera and species Subg. ''Gaudryceras (Gaudryceras) '' de Grossouvre, 1894 :''Gaudryceras (Gaudryceras) alamedense'' (Smith, 1889) :''Gaudryceras (Gaudryceras) aureum'' (Anderson, 1958) :''Gaudryceras (Gaudryceras) cassisianum'' d'Orbigny, 1850 :''Gaudryceras (Gaudryceras) delvallense'' (Anderson, 1958) :''Gaudryceras (Gaudryceras) denmanense'' (Whiteaves, 1903) :''Gaudryceras (Gaudryceras) mitis'' Hauer, 1866 :''Gaudryceras (Gaudryc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anagaudryceras
''Anagaudryceras'' is an extinct genus of ammonite from the later Cretaceous belonging to the Ammonoidea family Gaudryceratidae Gaudryceratidae is a family belonging to the extinct Ammonoidea, ammonoid suborder Lytoceratina that lived from the Barremian of the Lower Cretaceous to the Maastrichtian of the Upper Cretaceous. Gaudryceratids are lytocerins typically with roun .... ''Anagaudryceras'' has a moderately involute shell with a deep umbilicus and strongly ribbed outer whorl. Ribs are thick and rounded and cross over the venter uninterrupted. References * * Wani, R. 2007. Differential preservation of the Upper Cretaceous ammonoid ''Anagaudryceras limatum'' with corrugated shell in central Hokkaido, Japan. Acta Palaeontologica Polonica 52 (1) 200The Paleobiology Datase ''Anagaudriceras'' entryaccessed 5 April 2012 Lytoceratina Ammonites of Europe Ammonites of Australia Cretaceous ammonites of North America Albian genus first appearances Cenomanian genera Turonia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eotetragonites
''Eotetragonites'' is an extinct genus of ammonite.Sepkoski, Jac Sepkoski's Online Genus Database/ref> ''Eotetragonites'' is considered by some authors a subgenus of ''Eogaudryceras''. Species Species within this genus include: *''Eotetragonites duvali'' (A.V.M.D. D'Orbigny ) † *''Eotetragonites raspaili'' Breistroffer, 1947 † *''Eotetragonites rossmatteliformis'' *''Eotetragonites umbilicostriatum'' Collignon 1949 Fossil record The fossil record of this genus dates back to the Cretaceous (age range: from 112.6 to 99.7million years ago). Fossils of species within this genus have been found in Egypt, France, Madagascar, South Africa and United States (California). These cephalopods were fast-moving nektonic carnivores. See also * List of ammonite genera This list of ammonites is a comprehensive listing of genera that are included in the subclass †Ammonoidea, excluding purely vernacular terms. The list includes genera that are commonly accepted as valid, as well those t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lytoceratina
Lytoceratina is a Suborder (biology), suborder of Jurassic and Cretaceous Ammonitida, ammonites that produced loosely coiled, evolute and gyroconic shells in which the sutural element are said to have complex moss-like endings. Morphologic characteristics Shells are generally evolute, with all whorls exposed and touching, some are gyroconic with whorls separated by a space. Whorl sections vary from subcircular to narrowly compressed. The venter, or outer rim, is generally broadly arched but in some is keeled. Sides are either smooth or ribbed. Sutural elements are typically complex, referred to in the literature as moss-like, with adventious and secondary subdivisions. Saddle endings tend to be rounded but usually not phylloid, lobes tend to be more jagged with thorn-like endings. Aptychi are single valved and concentrically striated (Anaptychus) Derivation and phylogeny The Lytoceratina, which constitute a suborder within the Ammonitida, are derived from the Triassic Ussuriti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maritime Alps
The Maritime Alps (french: Alpes Maritimes ; it, Alpi Marittime ) are a mountain range in the southwestern part of the Alps. They form the border between the regions of France, French region of Provence-Alpes-Côte d'Azur and the regions of Italy, Italian regions of Piedmont and Liguria. They are the southernmost part of the Alps. Geography Administratively the range is divided between the Provinces of Italy, Italian provinces of Province of Cuneo, Cuneo and Province of Imperia, Imperia (eastern slopes) and the Departments of France, French department of Alpes-Maritimes (western slopes). The Maritime Alps are drained by the rivers Roya (river), Roya, Var River, Var and Verdon River, Verdon and their tributaries on the French side; by the Stura di Demonte and other tributaries of the Tanaro River, Tanaro and Po River, Po on the Italian side. There are many attractive perched villages, such as Belvédère at the entrance to the spectacular Gordolasque valley, some concealing unex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maastrichtian
The Maastrichtian () is, in the ICS geologic timescale, the latest age (uppermost stage) of the Late Cretaceous Epoch or Upper Cretaceous Series, the Cretaceous Period or System, and of the Mesozoic Era or Erathem. It spanned the interval from . The Maastrichtian was preceded by the Campanian and succeeded by the Danian (part of the Paleogene and Paleocene). The Cretaceous–Paleogene extinction event (formerly known as the Cretaceous–Tertiary extinction event) occurred at the end of this age. In this mass extinction, many commonly recognized groups such as non-avian dinosaurs, plesiosaurs and mosasaurs, as well as many other lesser-known groups, died out. The cause of the extinction is most commonly linked to an asteroid about wide colliding with Earth, ending the Cretaceous. Stratigraphic definitions Definition The Maastrichtian was introduced into scientific literature by Belgian geologist André Hubert Dumont in 1849, after studying rock strata of the Chalk Group c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonitida Families
Ammonitida is an order of Ammonoidea, 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 Perisphinctoidea are found ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Treatise On Invertebrate Paleontology
The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and covering every phylum, class, order, family, and genus of fossil and extant (still living) invertebrate animals. The prehistoric invertebrates are described as to their taxonomy, morphology, paleoecology, stratigraphic and paleogeographic range. However, taxa with no fossil record whatsoever have just a very brief listing. Publication of the decades-long ''Treatise on Invertebrate Paleontology'' is a work-in-progress; and therefore it is not yet complete: For example, there is no volume yet published regarding the post-Paleozoic era caenogastropods (a molluscan group including the whelk and Common periwinkle, periwinkle). Furthermore, every so often, previously published volumes of the ''Treatise'' are revised. Evolution of the proje ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonitic Suture
Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) than they are to shelled nautiloids such as the living ''Nautilus'' species. The earliest ammonites appeared during the Devonian, with the last species vanishing during the Cretaceous–Paleogene extinction event. Ammonites are excellent index fossils, and linking the rock layer in which a particular species or genus is found to specific geologic time periods is often possible. Their fossil shells usually take the form of planispirals, although some helically spiraled and nonspiraled forms (known as heteromorphs) have been found. The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams' horns. Pliny the Elder ( 79 AD near Pompe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Upper Cretaceous
The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', the Latin word for the white limestone known as chalk. The chalk of northern France and the white cliffs of south-eastern England date from the Cretaceous Period. Climate During the Late Cretaceous, the climate was warmer than present, although throughout the period a cooling trend is evident. The tropics became restricted to equatorial regions and northern latitudes experienced markedly more seasonal climatic conditions. Geography Due to plate tectonics, the Americas were gradually moving westward, causing the Atlantic Ocean to expand. The Western Interior Seaway divided North America into eastern and western halves; Appalachia and Laramidia. India maintained a northward course towards Asia. In the Southern Hemisphere, Australia and Anta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonoidea
Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) than they are to shelled nautiloids such as the living ''Nautilus'' species. The earliest ammonites appeared during the Devonian, with the last species vanishing during the Cretaceous–Paleogene extinction event. Ammonites are excellent index fossils, and linking the rock layer in which a particular species or genus is found to specific geologic time periods is often possible. Their fossil shells usually take the form of planispirals, although some helically spiraled and nonspiraled forms (known as heteromorphs) have been found. The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams' horns. Pliny the Elder ( 79 AD nea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
