|
Thaleops
''Thaleops'' is an extinct genus of trilobite of the family Illaenidae. It lived from the Floian to the Katian of the Ordovician in what is now North America. ''Thaleops'' can be told apart from other illaenids because of the cheek spines that many species possess under their eyes. ''Thaleops'' had a large distribution range, With some species being found in parts of Canada to some U.S states including Oklahoma, Wisconsin, and New York. It is thought to have lived in shallow water, as a study published in Oklahoma found that deposits that contained ''Thaleops'' and the asaphid trilobite '' Bumastides'' contained 4 times as many trilobite genera, where associated with shallow water areas. Classification Classification of ''Thaleops'', ''Illaenus ''Illaenus'' is a genus of trilobites from Russia and Morocco, from the middle Ordovician The Ordovician ( ) is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million yea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Illaenidae
The Illaenidae are a family of trilobites in the order Corynexochida. 223 currently accepted species in 24 genera are known from the Ordovician. Some scholars include the Panderiidae in the Illaenidae, but this is not generally supported. Distribution ''Illaenus? priscus'' from Salair and ''Illaenus? berkutensis'' from the Malyi Karatau, Kazakhstan (both Lower Tremadocian), are both very poorly known and it remains uncertain to which family they could best be assigned. The first certain Illaenid is ''I. hinomotoensis'' from the Upper Tremadocian of North China and South Korea. The earliest species known from Laurentia (western Ireland) is ''I. weaveri'', probably latest Floian. These early occurrences are from the tropics, but during the Darriwilian the family spread over southern Gondwana, and became cosmopolitan for the remainder of the Ordovician, although most genera had limited distributions. The genus ''Stenopareia'' survived the Ordovician–Silurian extinction events an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Horeb, Wisconsin
Mount Horeb is a village in Dane County, Wisconsin,. The population was 7,754 at the time of the 2020 census. It is part of the Madison Metropolitan Statistical Area. History The Ho-Chunk nation The Village of Mount Horeb is part of the ancestral territory of the Ho-Chunk nation. Ho-Chunk translates into "People of the Sacred Language," or "People of the Big Voice," and belong to the Siouan linguistic family. Beginning in 1829, the Ho-Chunk, sometimes referred to by the exonym, Winnebago (which is derived from the French "Ouinipegouek," or "People of the Stinking Water") experienced massive amounts of pressure from European and American settlers as their land was opened for agriculture and lead mining. Their territory was ceded to the United States' Government through three treaties: 1829, 1832, and 1837. The treaty signed in 1829, encompassed territory that would be the future site of Mount Horeb. These treaties, accompanied by colonizing pressure and xenophobic fears rising from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deposition (geology)
Deposition is the geological process in which sediments, soil and rocks are added to a landform or landmass. Wind, ice, water, and gravity transport previously weathered surface material, which, at the loss of enough kinetic energy in the fluid, is deposited, building up layers of sediment. Deposition occurs when the forces responsible for sediment transportation are no longer sufficient to overcome the forces of gravity and friction, creating a resistance to motion; this is known as the null-point hypothesis. Deposition can also refer to the buildup of sediment from organically derived matter or chemical processes. For example, chalk is made up partly of the microscopic calcium carbonate skeletons of marine plankton, the deposition of which has induced chemical processes (diagenesis) to deposit further calcium carbonate. Similarly, the formation of coal begins with the deposition of organic material, mainly from plants, in anaerobic conditions. Null-point hypothesis The null ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trilobites Of North America
Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period () and they flourished throughout the lower Paleozoic before slipping into a long decline, when, during the Devonian, all trilobite orders except the Proetida died out. The last extant trilobites finally disappeared in the mass extinction at the end of the Permian about 252 million years ago. Trilobites were among the most successful of all early animals, existing in oceans for almost 270 million years, with over 22,000 species having been described. By the time trilobites first appeared in the fossil record, they were already highly diversified and geographically dispersed. Because trilobites had wide diversity and an easily fossilized exoskeleton, they left an extensive fossil record. The s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trilobite Genera
Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period () and they flourished throughout the lower Paleozoic before slipping into a long decline, when, during the Devonian, all trilobite orders except the Proetida died out. The last extant trilobites finally disappeared in the mass extinction at the end of the Permian about 252 million years ago. Trilobites were among the most successful of all early animals, existing in oceans for almost 270 million years, with over 22,000 species having been described. By the time trilobites first appeared in the fossil record, they were already highly diversified and geographically dispersed. Because trilobites had wide diversity and an easily fossilized exoskeleton, they left an extensive fossil record. The stud ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Illaenus Crassicauda
''Illaenus crassicauda'' is a species of trilobites belonging to the family Illaenidae. These trilobites lived in the middle Ordovician and in the Silurian age (443 - 418 million years ago). Fossils of this species have been found in the sediments of Sweden and Russia. Etymology The Latin species name ''crassicauda'' means "fat-tailed", with reference to the shape of the pygidium. Description ''Illaenus crassicauda'' can reach a length of about . These trilobites are without glabella and without articulation of the tail. The cephalon Cephalon, Inc. was an American biopharmaceutical company co-founded in 1987 by pharmacologist Frank Baldino, Jr., neuroscientist Michael Lewis, and organic chemist James C. Kauer—all three former scientists with the DuPont Company. Baldino s ... has a high profile. The large bulbous head are distant from the axis of the head, close to the margin. References * V. JaanussonZur Fauna und zur Korrelation der Kalksteine mit Illaenus crassic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raymondaspis
''Raymondaspis'' is a genus of trilobites in the family Styginidae. It was described by Pribyl in 1949, and contains the species ''R. reticulatus'' and ''R. turgidus'' from the Whiterockian of Canada, ''R. vespertina'' from the Ordovician and Whiterockian of the United States and Norway, and a new species, ''R. grandigena'', which existed during the Middle Ordovician of what is now Sweden. ''R. grandigena'' was described in 2012 by Martin Stein and Jan Bergström. References External links ''Raymondaspis''at the Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms. History The Paleobiology Database (PBDB) originated in the NCEAS-funded Phanerozoic Marine Pale ... Styginidae Corynexochida genera Fossil taxa described in 1949 Ordovician trilobites of North America Paleozoic life of Newfoundland and Labrador {{Corynexochida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Illaenus
''Illaenus'' is a genus of trilobites from Russia and Morocco, from the middle Ordovician. Species included in this genus can reach a length of about . They are without glabella and without articulation of the tail. The cephalon has a high profile and recurved genal spines. Eyes are distant from the axis of the head, situated nearer to the edge. Selected species This genus includes about 50 species: *''Illaenus alveatus'' Raymond 1925 *''Illaenus auriculatus'' Ross, Jr. & Barnes 1967 *''Illaenus bayfieldi'' Billings 1859 *''Illaenus bucculentus'' Whittington 1963 *'' Illaenus consimilis'' Billings 1865 *'' Illaenus consobrinus'' Billings 1865 *'' Illaenus crassicauda'' Wahlenberg 1826 *'' Illaenus fraternus'' Billings 1865 *''Illaenus gelasinus'' Whittington 1965 *''Illaenus lacertus'' Whittington 1954 *'' Illaenus marginalis'' Raymond 1925 *''Illaenus oscitatus'' Fortey 1980 *''Illaenus slancyensis'' Krylov 2016 *''Illaenus spiculatus'' Whittington 1963 *''Illaenus tauricornis' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bumastides
''Bumastides'' is an extinct genus from a well-known class of fossil marine arthropods, the trilobite Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the At ...s. It lived during the Arenig stage of the Ordovician Period, approximately 478 to 471 million years ago. References Asaphida genera Ordovician trilobites Trilobites of North America {{asaphida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asaphidae
Asaphidae is a family of asaphid trilobites. Although the first genera originate in Upper Cambrian marine strata, the family becomes the most widely distributed and most species-rich trilobite family during the Ordovician. 754 species assigned to 146 genera are included in Asaphidae. Distribution Most Asaphinae are characteristic of Baltica. Isotelinae genera are concentrated in Laurentia. The genera of Nobiliasaphinae are distributed in tropical Gondwana and South China. The genera of Ogygiocaridinae occur in Avalonia, Gondwana and Baltica. Asaphidae asaphids were already fairly common during the Upper-Cambrian, when 14 genera are known from Australia, North- and South-China. The last members of the family died-out at the end of the Ordovician. Assigned genera Asaphidae contains the following genera: *'' Anataphrus'' *'' Araiocaris'' *'' Asaphellus'' *''Asaphus'' *'' Atopasaphus'' *'' Aulacoparia'' *'' Aulacoparina'' *'' Australopyge'' *'' Baltiites'' *'' Banqiaoites'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Trilobites Of North America")