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Asaphus Tyrannus
''Asaphus'' () is a genus of trilobites that is known from the Lower (upper Arenig) and Middle Ordovician of northwestern Europe (Sweden, Estonia, Saint Petersburg Area). Etymology The generic name is derived from the Greek word ''asaphes'', meaning "indistinct." Description The headshield (or cephalon) and tailshield (or pygidium) are semicircular and without a border (defined by a furrow or a change in convexity parallel to its margin). The cephalon is of approximately equal size as the pygidium (or isopygous). The central raised area of the cephalon (or glabella) is long, reaching the frontal margin. It may have faint lateral glabellar furrows or be smooth, and sometimes an inconspicuous tubercle is present just in front of the hardly discernible occipital ring. The natural fracture lines (sutures) of the head run along the top edges of the compound eye. From the back of the eye these cut to the back of the head (or is said to be opisthoparian) and not to the side. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Floian
The Floian is the second stage of the Ordovician Period. It succeeds the Tremadocian with which it forms the Lower Ordovician epoch. It precedes the Dapingian Stage of the Middle Ordovician. The Floian extended from to million years ago. The lower boundary is defined as the first appearance of the graptolite species '' Tetragraptus approximatus''. Naming and history The Floian Stage is named after Flo, a village in Västergötland, southern Sweden. The name "Floan" was proposed in 2004, but the International Commission on Stratigraphy adapted Floian as the official name of the stage. GSSP The GSSP A Global Boundary Stratotype Section and Point (GSSP) is an internationally agreed upon reference point on a stratigraphic section which defines the lower boundary of a stage on the geologic time scale. The effort to define GSSPs is conducted ... of the Floian is the Diabasbrottet Quarry () which is an outcrop of a shale-dominated stratigraphic succession. The lower bou ... [...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 periwinkle). Furthermore, every so often, previously published volumes of the ''Treatise'' are revised. Evolution of the project Raymond C. Moor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coronura
''Coronura'' is a trilobite in the order Phacopida, that existed during the Middle Devonian in what is now New York, U.S.A. It was described by Hall and Clarke in 1888, and the type species is ''Coronura aspectans'', which was originally described under the genus '' Asaphus'' by Conrad in 1841. The species was described from the Onondaga Formation. P.A. Jell and J.M. Adrain. Fossils of ''Coronura'' have also been found in Indiana,''Coronura'' at the |
Asaphus Expansus Ventral
''Asaphus'' () is a genus of trilobites that is known from the Lower (upper Arenig) and Middle Ordovician of northwestern Europe (Sweden, Estonia, Saint Petersburg Area). Etymology The generic name is derived from the Greek word ''asaphes'', meaning "indistinct." Description The headshield (or cephalon) and tailshield (or pygidium) are semicircular and without a border (defined by a furrow or a change in convexity parallel to its margin). The cephalon is of approximately equal size as the pygidium (or isopygous). The central raised area of the cephalon (or glabella) is long, reaching the frontal margin. It may have faint lateral glabellar furrows or be smooth, and sometimes an inconspicuous tubercle is present just in front of the hardly discernible occipital ring. The natural fracture lines (sutures) of the head run along the top edges of the compound eye. From the back of the eye these cut to the back of the head (or is said to be opisthoparian) and not to the side. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Geological Survey
The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization's work spans the disciplines of biology, geography, geology, and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility. The agency was founded on March 3, 1879. The USGS is a bureau of the United States Department of the Interior; it is that department's sole scientific agency. The USGS employs approximately 8,670 people and is headquartered in Reston, Virginia. The USGS also has major offices near Lakewood, Colorado, at the Denver Federal Center, and Menlo Park, California. The current motto of the USGS, in use since August 1997, is "science for a changing world". The agency's previous slogan, adopted on the occasion of its hundredth an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Stokes (collector)
Charles Stokes ( – 28 December 1853) was a London stockbroker who gained a reputation both as an amateur scientist and as an art collector. Biography According to the 1851 England Census, Stokes was born in the City of London, Middlesex around 1784. A baptism was recorded at St Andrew's in Holborn, City of London on 9 June 1783 for Charles Stokes, son of John Stokes and Agnes Partridge Stokes of Shoe Lane (off Fleet Street) in the City of London). Upon his death in December 1853, Stokes was widely reported to be in his 70th year (typically meaning aged 69). Stokes was also listed as age 69 when his death was recorded.''London, England, Church of England Deaths and Burials, 1813-2003'' He seems never to have married. He is recorded as being a partner in the stockbroking firm of Hodges & Stokes, Threadneedle Street. Between 1835 and 1851, he is recorded as living in Gray's Inn Road, at Verulam Buildings, a housing development which had been designed for the professional ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asaphus Kowalewskii
''Asaphus kowalewskii'' () is one of the 35 species of trilobites of the genus ''Asaphus'' (this particular species is sometimes placed in its own genus, ''Neoasaphus''). Fossils of this species are popular among collectors because of their prominent stalked eyes In anatomy, an eyestalk (sometimes spelled eye stalk and also known as an ommatophore) is a protrusion that extends an eye away from the body, giving the eye a better field of view. It is a common feature in nature and frequently appears in fict ... (termed "peduncles"), many an inch or more in length. In the Ordovician period, an inland sea formed in what is now Eastern Europe. The sea contained a remarkably diverse trilobite fauna. Over a dozen species of ''Asaphus'' developed in this sea, with many species, including unrelated species, developing long eyestalks in various lengths. That so many species of trilobite developed eyestalks suggests that they were trying to overcome increased turbidity, or there was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valdar Jaanusson
Valdar Jaanusson (1923–1999) was an Estonian-Swedish geologist. In 1960 he introduced the concept of topostratigraphy into Swedish stratigraphy. A recognized expert on the geology of the Ordovician period, he was member of the Estonian Academy of Sciences Founded in 1938, the Estonian Academy of Sciences ( et, Eesti Teaduste Akadeemia) is Estonia's national academy of science in Tallinn. As with other national academies, it is an independent group of well-known scientists whose stated aim is to .... Dagens Nyheter. References 1923 births 1999 deaths[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Entomolithus
''Entomolithus'' (petrified insect) is an obsolete scientific name for several trilobites, first published by Linnaeus in 1753, before the starting point of zoological nomenclature in a list under the heading "Paradoxus: 3. Entomolithus Monoculi". This is why this first name has no formal status. After the starting point of the zoological nomenclature, the name was published again in 1759, but with a different description. Because scholars incorrectly considered ''Entomolithus'' Linnaeus, 1759 a junior homonym, it was later replaced by ''Entomostracites'' Wahlenberg, 1818. Although the name as published in 1759 was in fact valid, the International Commission on Zoological Nomenclature decided to suppress ''Entomolithus'' Linnaeus, 1759, because this name had gone out of use for a very long time. Species originally assigned to ''Entomolithus'' have been renamed. * ''E. paradoxus'' = '' Paradoxides paradoxissimus'' * ''E. paradoxus α expansus'' = ''Asaphus expansus ''Asaphus ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Entomostracites
''Entomostracites'' is a scientific name for several trilobites, now assigned to various other genera. * ''E. bucephalus'' = '' Paradoxides paradoxissimus'' * ''E. crassicauda'' = ''Illaenus crassicauda'' * ''E. expansus'' = ''Asaphus expansus ''Asaphus expansus'' () is the type species of the asaphid 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 fir ...'' * ''E. gibbosus'' = '' Olenus gibbosus'' * ''E. granulatus'' = '' Nankinolithus granulatus'' * ''E. laciniatus'' = '' Lichas laciniatus'' * ''E. laticauda'' = '' Eobronteus laticauda'' * ''E. paradoxissimus'' = '' Paradoxides paradoxissimus'' * ''E. pisiformis'' = '' Agnostus pisiformis'' * ''E. punctatus'' = '' Encrinurus punctatus'' * ''E. scarabaeoides'' = '' Peltura scarabaeoides'' * ''E. spinulosus'' = '' Parabolina spinulosa'' References {{Set index article, animals Disused trilo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
