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Misikella
''Misikella'' is an extinct genus of conodonts. Two species were named as type species for the genus in separate publications by the same authors in the same year (1974). The first paper named ''Misikella longidentata'', while the second named ''Misikella posthernsteini''. Most species assigned to ''Misikella'' have a Norian-Rhaetian distribution and a bimembrate conodont apparatus, including ''M. posthernsteini''. On the other hand, ''M. longidentata'' has a Carnian-Norian distribution and a tetramembrate apparatus. Fåhræus & Ryley (1989) retained the name ''Misikella'' for only ''M. longidentata'', placing the rest of the species into the new genus ''Axiothea''. However, other conodont specialists utilize the name ''Misikella'' primarily in the context of ''M. posthernsteini'' and other bimembrate species, rather than ''M. longidentata''. Use in stratigraphy The top of the Norian (the base of the Rhaetian The Rhaetian is the latest age of the Triassic Period (in geoc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhaetian
The Rhaetian is the latest age of the Triassic Period (in geochronology) or the uppermost stage of the Triassic System (in chronostratigraphy). It was preceded by the Norian and succeeded by the Hettangian (the lowermost stage or earliest age of the Jurassic). The base of the Rhaetian lacks a formal GSSP, though candidate sections include Steinbergkogel in Austria (since 2007) and Pignola-Abriola in Italy (since 2016). The end of the Rhaetian (and the base of the overlying Hettangian Stage) is more well-defined. According to the current ICS (International Commission on Stratigraphy) system, the Rhaetian ended ± 0.2 Ma (million years ago). In 2010, the base of the Rhaetian (i.e. the Norian-Rhaetian boundary) was voted to be defined based on the first appearance of '' Misikella posthernsteini'', a marine conodont. However, there is still much debate over the age of this boundary, as well as the evolution of ''M. posthernsteini''. The most comprehensive source of precise age ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Norian First Appearances
The Norian is a division of the Triassic Period. It has the rank of an age (geochronology) or stage (chronostratigraphy). It lasted from ~227 to million years ago. It was preceded by the Carnian and succeeded by the Rhaetian. Stratigraphic definitions The Norian was named after the Noric Alps in Austria. The stage was introduced into scientific literature by Austrian geologist Edmund Mojsisovics von Mojsvar in 1869. The Norian Stage begins at the base of the ammonite biozones of '' Klamathites macrolobatus'' and '' Stikinoceras kerri'', and at the base of the conodont biozones of '' Metapolygnathus communisti'' and '' Metapolygnathus primitius''. A global reference profile for the base (a GSSP) had in 2009 not yet been appointed. The top of the Norian (the base of the Rhaetian) is at the first appearance of ammonite species '' Cochloceras amoenum''. The base of the Rheatian is also close to the first appearance of conodont species '' Misikella spp.'' and ''Epigondolella mosh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Norian
The Norian is a division of the Triassic Period. It has the rank of an age (geochronology) or stage (chronostratigraphy). It lasted from ~227 to million years ago. It was preceded by the Carnian and succeeded by the Rhaetian. Stratigraphic definitions The Norian was named after the Noric Alps in Austria. The stage was introduced into scientific literature by Austrian geologist Edmund Mojsisovics von Mojsvar in 1869. The Norian Stage begins at the base of the ammonite biozones of '' Klamathites macrolobatus'' and '' Stikinoceras kerri'', and at the base of the conodont biozones of '' Metapolygnathus communisti'' and '' Metapolygnathus primitius''. A global reference profile for the base (a GSSP) had in 2009 not yet been appointed. The top of the Norian (the base of the Rhaetian) is at the first appearance of ammonite species '' Cochloceras amoenum''. The base of the Rheatian is also close to the first appearance of conodont species '' Misikella spp.'' and '' Epigondolella mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Global Boundary Stratotype Sections And Points
This is a list of Global Boundary Stratotype Sections and Points. Since 1977, Global Boundary Stratotype Sections and Points (abbreviated GSSPs) are internationally agreed upon reference points on stratigraphic sections of rock which define the lower boundaries of stages on the geologic time scale. They are selected by the International Commission on Stratigraphy based on multiple factors, but their accessibility and the degree to which they are representative of the same boundary on sections worldwide are among the most important. Since GSSPs require well-preserved sections of rock without interruptions in sedimentation, and since most are defined by different stages of animal life, defining them becomes progressively more difficult as one goes further back in time. Organization of this list This list is divided first into the geologic eras of the Phanerozoic (the Cenozoic, the Mesozoic, and the Paleozoic) and then into the geologic periods of each era. Each period is marked ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heinz Kozur
Heinz Walter Kozur (born 26 March 1942 in Hoyerswerda; died 20 December 2013 in Budapest) was a German paleontologist and stratigrapher. In 1974, with Mock, he described the conodont genus '' Misikella'', in 1975, with Merrill, the genus '' Diplognathodus'', in 1977, the genus '' Vjalovognathus'', in 1988, the genus '' Budurovignathus'', in 1989, the genus ''Mesogondolella'', in 1990, the genera ''Clarkina'' and ''Chiosella'' and in 2003, the genus ''Carnepigondolella''. In 2011, with RE Weems, he made additions to the uppermost Alaunian through Rhaetian (Triassic) conchostracan Clam shrimp are a group of bivalved branchiopod crustaceans that resemble the unrelated bivalved molluscs. They are extant and also known from the fossil record, from at least the Devonian period and perhaps before. They were originally classifi ... zonation of North America.Additions to the uppermost Alaunian through Rhaetian (Triassic) conchostracan zonation of North America: New Mexico Museu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epigondolella Mosheri
''Epigondolella'' is an extinct genus of conodonts in the family Gondolellidae. Synonyms '' Mazzaella'' is a new genus for ''Epigondolella carnica'' Krystyn (1975). Use in stratigraphy The top of the Norian (or the base of the Rhaetian, in the Late Triassic) is close to the first appearances of the conodonts ''Misikella ''Misikella'' is an extinct genus of conodonts. Two species were named as type species for the genus in separate publications by the same authors in the same year (1974). The first paper named ''Misikella longidentata'', while the second name ...'' spp. and ''Epigondolella mosheri''. References External links * * Ozarkodinida genera Late Triassic fish Triassic conodonts {{conodont-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conodont Genera
This is a list of conodonts genera, sorted in alphabetical order. A-C * †'' Acanthodus'' * †''Acodus'' * †'' Acuminatella'' * †'' Alternognathus'' * †'' Amorphognathus'' * †''Ancyrodella'' * †''Ancyrognathus'' * †'' Anticostiodus'' * †''Appalachignathus'' * †'' Arianagnathus'' * †'' Bactrognathus'' * †'' Baltoniodus'' * †'' Basselodus'' * †'' Belodina'' * †'' Budurovignathus'' * †''Carnepigondolella'' * †''Carniodus'' * †''Cavusgnathus'' * †''Chiosella'' * †'' Chirodella'' * †'' Chirognathus'' * †''Colaptoconus'' * †'' Complexodus'' * †''Cordylodus'' * †''Cornuodus'' * †''Clarkina'' * †''Clydagnathus'' * †''Cryptotaxis'' * †''Ctenognathodus'' * †''Culumbodina'' * †'' Curtognathus'' * †'' Cypridodella'' D-E * †'' Dapsilodus'' * †'' Declinognathodus'' * †'' Decoriconus'' * †'' Diaphorodus'' * †'' Diplognathodus'' * †'' Distomodus'' * †'' Doliognathus'' * †'' Dollymae'' * †'' Drepanodus'' * †'' Eo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
R Mock
R, or r, is the eighteenth letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''ar'' (pronounced ), plural ''ars'', or in Ireland ''or'' . The letter is the eighth most common letter in English and the fourth-most common consonant (after , , and ). The letter is used to form the ending "-re", which is used in certain words such as ''centre'' in some varieties of English spelling, such as British English. Canadian English also uses the "-re" ending, unlike American English, where the ending is usually replaced by "-er" (''center''). This does not affect pronunciation. Name The name of the letter in Latin was (), following the pattern of other letters representing continuants, such as F, L, M, N and S. This name is preserved in French and many other languages. In Middle English, the name of the letter changed from to , following a pattern exhibited in many ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1974 In Paleontology
Bryophytes Plants Angiosperms Archosauromorphs General research * ''Massospondylus'' gastroliths are documented.Raath (1974). Sanders, Manley, and Carpenter (2001), "Table 12.1" page 167. Newly named dinosaurs Data courtesy of George Olshevsky's dinosaur genera list. Newly named birds Newly named pterosaurs References {{Reflist * Raath, M.A. (1974). Fossil vertebrate studies in Rhodesia: further evidence of gastroliths in Prosauropod dinosaurs. Arnoldia Rhodesia. 7 (5): 1–7. * Sanders F, Manley K, Carpenter K. Gastroliths from the Lower Cretaceous sauropod Cedarosaurus weiskopfae. In: Tanke D.H, Carpenter K, editors. Mesozoic vertebrate life: new research inspired by the paleontology of Philip J. Currie. Indiana University Press; Bloomington, IN: 2001. pp. 166–180. Paleontology Paleontology (), also spelled palaeontology or palæontology, is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene ep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conodont
Conodonts (Greek ''kōnos'', "cone", + ''odont'', "tooth") are an extinct group of agnathan (jawless) vertebrates resembling eels, classified in the class Conodonta. For many years, they were known only from their tooth-like oral elements, which are usually found in isolation and are now called conodont elements. Knowledge about soft tissues remains limited. They existed in the world's oceans for over 300 million years, from the Cambrian to the beginning of the Jurassic. Conodont elements are widely used as index fossils, fossils used to define and identify geological periods. The animals are also called Conodontophora (conodont bearers) to avoid ambiguity. Discovery and understanding of conodonts The teeth-like fossils of the conodont were first discovered by Heinz Christian Pander and the results published in Saint Petersburg, Russia, in 1856. The name ''pander'' is commonly used in scientific names of conodonts. It was only in the early 1980s that the first fossil evidence of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carnian
The Carnian (less commonly, Karnian) is the lowermost stage of the Upper Triassic Series (or earliest age of the Late Triassic Epoch). It lasted from 237 to 227 million years ago (Ma). The Carnian is preceded by the Ladinian and is followed by the Norian. Its boundaries are not characterized by major extinctions or biotic turnovers, but a climatic event (known as the Carnian pluvial episode characterized by substantial rainfall) occurred during the Carnian and seems to be associated with important extinctions or biotic radiations. Stratigraphic definitions The Carnian was named in 1869 by Mojsisovics. It is unclear if it was named after the Carnic Alps or after the Austrian region of Carinthia (''Kärnten'' in German) or after the Carnia historical region in northwestern Italy. The name, however, was first used referring to a part of the Hallstatt Limestone cropping out in Austria. The base of the Carnian Stage is defined as the place in the stratigraphic record where t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chordata
A chordate () is an animal of the phylum Chordata (). All chordates possess, at some point during their larval or adult stages, five synapomorphies, or primary physical characteristics, that distinguish them from all the other taxa. These five synapomorphies include a notochord, dorsal hollow nerve cord, endostyle or thyroid, pharyngeal slits, and a post-anal tail. The name “chordate” comes from the first of these synapomorphies, the notochord, which plays a significant role in chordate structure and movement. Chordates are also Bilateral symmetry, bilaterally symmetric, have a coelom, possess a circulatory system, and exhibit Metameric, metameric segmentation. In addition to the morphological characteristics used to define chordates, analysis of genome sequences has identified two conserved signature indels (CSIs) in their proteins: cyclophilin-like protein and mitochondrial inner membrane protease ATP23, which are exclusively shared by all vertebrates, tunicates and cep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
