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Allgäu Formation
The Allgäu Formation is a Formation (geology), geologic formation in Austria. It preserves fossils dating back to the Hettangian to Sinemurian stages of the Early Jurassic Period (geology), period, or Raricostatum to Obtusum in the regional stratigraphy. Initially and formally defined by Jacobshagen (1965).Jacobshagen, 1965 The Allgäu Formation is formerly known as spotted marls (Lias-Fleckenmergel) and spotted marly limestones (Fleckenkalk). The formation is represented by dark-grey bioturbated limestones and marlstone interbeds. It represents basinal hemipelagic faciesGawlick et al., 2009 common in Alpine Tethys Ocean, Tethys regions of Alps, Carpathians and other mountain ranges. Several horizons of the formation are particularly rich in ammonite fauna. Fossil content ;Fish * ''Agkistracanthus, Agkistracanthus sp.''Duffin & Furrer, 1981 ;AmmonitesBlau, 1998 * ''Echioceras, Echioceras raricostatoides'' * ''Epophioceras, Epophioceras landrioti'' * ''Leptechioceras, Leptechio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formation (stratigraphy)
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics (lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness (geology), thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marlstone
Marl is an earthy material rich in carbonate minerals, clays, and silt. When hardened into rock, this becomes marlstone. It is formed in marine or freshwater environments, often through the activities of algae. Marl makes up the lower part of the cliffs of Dover, and the Channel Tunnel follows these marl layers between France and the United Kingdom. Marl is also a common sediment in post- glacial lakes, such as the marl ponds of the northeastern United States. Marl has been used as a soil conditioner and neutralizing agent for acid soil and in the manufacture of cement. Description Marl or marlstone is a carbonate-rich mud or mudstone which contains variable amounts of clays and silt. The term was originally loosely applied to a variety of materials, most of which occur as loose, earthy deposits consisting chiefly of an intimate mixture of clay and calcium carbonate, formed under freshwater conditions. These typically contain 35–65% clay and 65–35% carbonate. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Juraphyllites
Juraphyllites is a genus of ammonites belonging to the family Juraphyllitidae. Fossil record These ammonites lived in the Jurassic from Sinemurian to Toarcian (age range: 196.5 to 182.0 million years ago). Fossils of this genus can be found in , , , , |
Asteroceras
''Asteroceras'' is an extinct genus of cephalopod belonging to the Ammonite subclass. These fast-moving nektonic carnivores lived during the Triassic and Jurassic periods (from 205.6 to 189.6 Ma). Species *''Asteroceras blakei'' Spath, 1925 *''Asteroceras confusum'' Spath, 1925 *''Asteroceras obtusum'' (Sowerby, 1817) *''Asteroceras reynesi'' Fucini, 1903 *''Asteroceras saltriensis'' Parona, 1896 *''Asteroceras smithii'' (Sowerby, 1814) *''Asteroceras stellare'' (Sowerby 1815) *''Asteroceras turneri'' (Sowerby, 1814) Paleobiology Database - Asteroceras 2014-05-29. Distribution ''Asteroceras'' fossils may be found in the Jurassic marine strata of Canada, China, Germany, Hong Kong, Hungary, Peru, and Turkey, in the Triassic of United States an ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echioceras
''Echioceras'' is an extinct genus of ammonites from the Early Jurassic of Europe and North America. Description Shell of ''Echioceras'' species can reach a diameter of about .. The narrow and broad evolute shell is reinforced by fine ribs on inner whorls, progressively becoming stronger, straight and distinct. Distribution Fossils of species within this genus have been found in the Jurassic rocks of Canada, Hong Kong, Turkey and United Kingdom, CarpathiansRakús, M., 1962: Amonity v liase Západných Karpát (Ammonites in Liassic of Western Carpathians). Geologické práce, Zošit 62, pp. 267 - 271 and Alps. References ;Notes ;Bibliography *Cyril Walker & David Ward (1993) - Fossielen: Sesam Natuur Handboeken, Bosch & Keuning, Baarn. Psiloceratoidea Ammonitida genera Early Jurassic ammonites of Europe Early Jurassic ammonites of North America Early Jurassic ammonites of Asia Sinemurian life {{ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agkistracanthus
''Agkistracanthus'' is an extinct genus of Chimaera from the Mesozoic era. It currently contains a single species, ''A. mitgelensis''. It is known from the Rhaetian to Hettangian epochs, spanning the transition from the Triassic to Jurassic period. Fossils from this genus are known from Switzerland, Austria, and Britain Britain most often refers to: * The United Kingdom, a sovereign state in Europe comprising the island of Great Britain, the north-eastern part of the island of Ireland and many smaller islands * Great Britain, the largest island in the United King .... It is known mostly from isolated and fragmentary material, including fin spines as well as palantine, symphyseal, and mandibular structures.Duffin, C. J., & Milan, J. (2017). A new myriacanthid holocephalian from the Early Jurassic of Denmark. ''Bulletin of the Geological Society of Denmark'', ''65'', 161-170. References {{Taxonbar, from=Q99775221 Chimaeriformes Fossils of Austria Prehistoric cartilagino ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonite
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 Pomp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
