|
2013 In Paleomalacology
This list, 2013 in molluscan paleontology, is a list of new taxa of ammonites and other fossil cephalopods, as well as fossil gastropods, bivalves and other molluscs that have been binomial nomenclature, described during the year 2013. Ammonites Other cephalopods Gastropods Other molluscs References {{Reflist, 2 Paleomalacology Molluscs described in 2013, Paleontology 2013 in paleontology ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemihoplitidae
Hemihoplitidae is an extinct family of ammonoid cephalopods belonging to the superfamily Ancyloceratoidea. Fossils of species within this genus have been found in the Cretaceous rocks of southeastern France, Mexico, Slovakia, South Africa and Trinidad and Tobago. Genera * '' Gassendiceras'' Bert, Delanoy & Bersac, 2006 * ''Hemihoplites ''Hemihoplites'' is an extinct genus of ammonoid cephalopods belonging to the family Hemihoplitidae. with and (1996), ''Mollusca 4 Revised , Cretaceous Ammonoidea'', vol. 4, in ''Treatise on Invertebrate Paleontology'', Part L (Roger L. Kaes ...'' Spath, 1924 References Ancyloceratoidea Ammonitida families Cretaceous ammonites Valanginian first appearances Early Cretaceous extinctions {{Ammonitida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acrioceratidae
Acrioceratidae is a family of heteromorph ammonites included in the Ancyloceratoidea comprising ancyloceratid-like forms that start off with a coiled juvenile section, followed by a straight or curved shaft ending in a hook. Two described genera are included, ''Acrioceras'' and '' Dissimilites''. The Acrioceratidae form a link, or evolutionary transition, between the loosely coiled Crioceratidae and the commonly tuberculate and heavy hooked Ancyloceratidae. Although resembling ''Acrioceras'' in general form, '' Toxancyloceras'' is included in the Ancyloceratidae where it resides as a transitional form. The primary morphological distinction between the Acrioceratidae and Ancycloceratidae is that the Acrioceratidae generally lack the tubercles and spines characteristic of the ancyloceratids. They differ from the ancestral Crioceratidae in that, like the Ancyloceratidae, they are truly heteromorphic (crioceratids aren't) with distinct growth phases. The Treatise on Invertebr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Cretaceous
The Early Cretaceous (geochronological name) or the Lower Cretaceous ( chronostratigraphic name), is the earlier or lower of the two major divisions of the Cretaceous. It is usually considered to stretch from 145 Ma to 100.5 Ma. Geology Proposals for the exact age of the Barremian-Aptian boundary ranged from 126 to 117 Ma until recently (as of 2019), but based on drillholes in Svalbard the defining early Aptian Oceanic Anoxic Event 1a (OAE1a) was carbon isotope dated to 123.1±0.3 Ma, limiting the possible range for the boundary to c. 122–121 Ma. There is a possible link between this anoxic event and a series of Early Cretaceous large igneous provinces (LIP). The Ontong Java- Manihiki- Hikurangi large igneous province, emplaced in the South Pacific at c. 120 Ma, is by far the largest LIP in Earth's history. The Ontong Java Plateau today covers an area of 1,860,000 km2. In the Indian Ocean another LIP began to form at c. 120 Ma, the Kergue ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scaphitidae
Scaphitidae is a family of extinct cephalopods belonging to the family of heteromorph ammonites (suborder Ancyloceratina). There is a possible fossil record of them being the last ammonites with fossils dating to the Danian of the Paleocene in Denmark, The Netherlands, The US and Turkmenistan. Genera Scaphitidae Gill, 1871 *Subfamily Otoscaphitinae Wright, 1953 **''Yezoites'' Yabe, 1910 *Subfamily Scaphitinae Gill, 1871 **'' Acanthoscaphites'' Nowak, 1911 **''Clioscaphites ''Clioscaphites'' is an extinct genus of ammonite belonging to the family Scaphitidae. Species in this genus are important index fossils of the Western Interior Seaway of the Coniacian to Santonian Ages of the Cretaceous The Cretaceous ( ) is ...'' Cobban, 1951 **'' Discoscaphites'' Meek, 1870 **'' Eoscaphites'' Breistroffer, 1947 **'' Hoploscaphites'' Nowak, 1911 **'' Indoscaphites'' Spath, 1953 **'' Jeletzkytes'' Riccardi, 1983 **'' Ponteixites'' Warren, 1934 **'' Rhaeboceras'' Meek, 1876 **'' Scap ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emsian
The Emsian is one of three faunal stages in the Early Devonian Epoch. It lasted from 407.6 ± 2.6 million years ago to 393.3 ± 1.2 million years ago. It was preceded by the Pragian Stage and followed by the Eifelian Stage. It is named after the Ems river in Germany. The GSSP is located in the Zinzil'ban Gorge in the Kitab State Geological Reserve of Uzbekistan, above the contact with the Madmon Formation. In North America the Emsian Stage is represented by Sawkill or Sawkillian time. Biological events During this period, earliest known agoniatitid ammonoid fossils began appearing within this stage after first appearing in previous stage and began to evolutionarily radiate within this stage, in which a new ammonoid order Goniatitida rises in the end of Zlichovian stage (Siberian representation; corresponds to early Eifelian and after the end of Early Devonian, before 391.9 mya Mya may refer to: Brands and product names * Mya (program), an intelligent personal as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
