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Agraulos
''Agraulos'' Hawle & Corda 1847, is a genus of trilobites that lived during the Middle Cambrian in North America and Europe, particularly the Czech Republic. Etymology ''Agraulos'' is derived from the Greek , "country woman", wife of Kekrops. Type species Type species (designated by Miller 1889). ''Arion ceticephalus'' Barrande, 1846 from the Cambrian ''Eccaparadoxides pusillus'' Zone in the Skryje Member of the Buchava Formation, within the Skryje–Tyrovice Basin, Bohemia. Familial status Family SOLENOPLEURIDAE (Angelin, 1854). Subfamily AGRAULINAE Fletcher, 2017 emend. ''nom. transl. ex'' AGRAULIDAE Raymond. 1913. Diagnosis Agraulinae with cephala generally domed; glabella isosceles-trapezoidal, i.e. with truncate front and base angles of the forward-converging lateral margins/flanks more than 15°; occipital ring mesially swollen backwards, with or without a medial node or spine; preglabellar field relatively long (sag.); posterolateral projection of fixigena ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arionellus
''Arionellus'' Joachim Barrande, Barrande, 1850, is a disused name for a genus of trilobite. The name ''Arionellus'' was a replacement for ''Arionides'' Barrande, 1847, itself a replacement for ''Arion'' Barrande, 1846, which was preoccupied because André Étienne d'Audebert de Férussac, Férussac had already used it in 1819 for a genus of Arion (gastropod), slugs. ''Agraulos'' had already been proposed as replacement for ''Arion'' by Hawle and Corda in 1847, but Barrande unjustly considered it a homonym of Gulf Fritillary, ''Agraulis'', a butterfly named by Jean Baptiste Boisduval, Boisduval in 1836. The species of ''Arionellus'' have now been reassigned to the following genera. * ''A. bipunctatus'' Synonym (taxonomy), = ''Croixana, Croixana bipunctata'' * ''A. ceticephalus'' Synonym (taxonomy), = ''Agraulos, Agraulos ceticephalus'' * ''A. convexus'' Synonym (taxonomy), = ''Camaraspis, Camaraspis convexa'' * ''A. cylindricus'' Synonym (taxonomy), = ''Keithiella, Keithiella cyli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Middle Cambrian
Middle or The Middle may refer to: * Centre (geometry), the point equally distant from the outer limits. Places * Middle (sheading), a subdivision of the Isle of Man * Middle Bay (other) * Middle Brook (other) * Middle Creek (other) * Middle Island (other) * Middle Lake (other) * Middle Mountain, California * Middle Peninsula, Chesapeake Bay, Virginia * Middle Range, a former name of the Xueshan Range on Taiwan Island * Middle River (other) * Middle Rocks, two rocks at the eastern opening of the Straits of Singapore * Middle Sound, a bay in North Carolina * Middle Township (other) * Middle East Music * "Middle" (song), 2015 * "The Middle" (Jimmy Eat World song), 2001 * "The Middle" (Zedd, Maren Morris and Grey song), 2018 *"Middle", a song by Rocket from the Crypt from their 1995 album ''Scream, Dracula, Scream!'' *"The Middle", a song by Demi Lovato from their debut album ''Don't Forget'' *"The Middle", a son ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chamberlain's Brook Formation
The Chamberlain's Brook Formation is a thin but distinctive Formation (stratigraphy), geologic formation of dark red calcareous mudstonesNormore, L. S. 2012: GEOLOGY OF THE RANDOM ISLAND MAP AREA (Nts 2C/04), Newfoundland. Current Research (2012) Newfoundland and Labrador Department of Natural Resources Geological Survey Report 12-:121–145. that crops out from Rhode Island to Massachusetts and, Nova Scotia, New Brunswick and Newfoundland. It preserves fossils, including trilobites, dating back to the lower mid-Cambrian Period (geology), period. Its lowermost member is the Braintree Member (lowest Middle Cambrian) and the uppermost member is the Fossil Brook Member. See also * List of fossiliferous stratigraphic units in Massachusetts * Paleontology in Massachusetts References * Geologic formations of Rhode Island Geologic formations of Massachusetts Geology of Nova Scotia Geologic formations of New Brunswick Geology of Newfoundland and Labrador Cambrian System of Nor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleozoic Life Of British Columbia
The Paleozoic (or Palaeozoic) Era is the earliest of three geologic eras of the Phanerozoic Eon. The name ''Paleozoic'' ( ;) was coined by the British geologist Adam Sedgwick in 1838 by combining the Greek words ''palaiós'' (, "old") and ''zōḗ'' (), "life", meaning "ancient life" ). It is the longest of the Phanerozoic eras, lasting from , and is subdivided into six geologic periods (from oldest to youngest): # Cambrian # Ordovician # Silurian # Devonian # Carboniferous # Permian The Paleozoic comes after the Neoproterozoic Era of the Proterozoic Eon and is followed by the Mesozoic Era. The Paleozoic was a time of dramatic geological, climatic, and evolutionary change. The Cambrian witnessed the most rapid and widespread diversification of life in Earth's history, known as the Cambrian explosion, in which most modern phyla first appeared. Arthropods, molluscs, fish, amphibians, reptiles, and synapsids all evolved during the Paleozoic. Life began in the ocean but ev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambrian Trilobites Of North America
The Cambrian Period ( ; sometimes symbolized Ꞓ) was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million years ago (mya) to the beginning of the Ordovician Period mya. Its subdivisions, and its base, are somewhat in flux. The period was established as "Cambrian series" by Adam Sedgwick, who named it after Cambria, the Latin name for 'Cymru' (Wales), where Britain's Cambrian rocks are best exposed. Sedgwick identified the layer as part of his task, along with Roderick Murchison, to subdivide the large "Transition Series", although the two geologists disagreed for a while on the appropriate categorization. The Cambrian is unique in its unusually high proportion of sedimentary deposits, sites of exceptional preservation where "soft" parts of organisms are preserved as well as their more resistant shells. As a result, our understanding of the Cambrian biol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossils Of The Czech Republic
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Paleontology is the study of fossils: their age, method of formation, and evolutionary significance. Specimens are usually considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years old to 4.1 billion years old. Early edition, published online before print. The observation in the 19th century that certain fossils were associated with certain rock strata led to the recognition of a geological timescale and the relative ages of different fossils. The development of radiometric dating techniques in the early 20th century allowed scientists to quantitatively measure the abso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambrian Trilobites Of Europe
The Cambrian Period ( ; sometimes symbolized Ꞓ) was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million years ago (mya) to the beginning of the Ordovician Period mya. Its subdivisions, and its base, are somewhat in flux. The period was established as "Cambrian series" by Adam Sedgwick, who named it after Cambria, the Latin name for 'Cymru' (Wales), where Britain's Cambrian rocks are best exposed. Sedgwick identified the layer as part of his task, along with Roderick Murchison, to subdivide the large "Transition Series", although the two geologists disagreed for a while on the appropriate categorization. The Cambrian is unique in its unusually high proportion of sedimentary deposits, sites of exceptional preservation where "soft" parts of organisms are preserved as well as their more resistant shells. As a result, our understanding of the Cambrian biolo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ptychopariida Genera
Ptychopariida is a large, heterogeneous order of trilobite containing some of the most primitive species known. The earliest species occurred in the second half of the Lower Cambrian, and the last species did not survive the Ordovician–Silurian extinction event. Trilobites have facial sutures that run along the margin of the glabella and/or fixigena to the shoulder point where the cephalon meets the thorax. These sutures outline the cranidium, or the main, central part of the head that does not include the librigena (free cheeks). The eyes are medial along the glabella on the suture line (and some species have no eyes). The fossils of the moults of trilobites can often be told from the fossils of the actual animals by whether the librigena are present. (The librigena, or cheek spines, detach during moulting.) In ptychopariids, short bladelike genal spines are often present on the tips of the librigena. The thorax is large and is typically made up of eight or more segments. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clogau Formation
The Clogau (pronounced "clog-eye") Gold Mine (also known as Clogau St David's) is a gold mine near Bontddu in North Wales. History The Clogau mine was opened to exploit the copper and lead veins in the area north of Bontddu. In 1854, gold was discovered at the mine in a vein of quartz. The main gold-bearing vein was named the "St. David's lode", and in 1860 arrangements were made with the Crown Estate to work the gold commercially. Operations started on 28 August 1860. Clogau produced significant amounts of gold in the 1890s. In 1899, it produced £60,000 worth of gold (). In 1919, exploration of the mine found new gold veins. A new crushing plant was installed and the mine was re-opened. In 1989 the Clogau Gold Mine was re-opened by William Roberts, founder of Clogau Gold of Wales Ltd. Gold extraction re-commenced between 1992 and 1998, with small-scale mining providing the gold for Clogau Gold jewellery. Mining eventually ceased in 1998 due to high cost of mining and diminis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Condylopyge
''Condylopyge'' Hawle and Corda (1847) is a genus of agnostid trilobite that lived during the late Lower and early Middle Cambrian, in what are today Canada (Newfoundland and New Brunswick), the Czech Republic, England and Wales, France, Germany, Italy, Morocco, the Russian Federation (North-East Siberia), Spain, Turkey and Sweden. It can easily be distinguished from all other Agnostida because the frontal glabellar lobe is notably wider than the rear lobe. It belongs to the same family as '' Pleuroctenium'' but the frontal glabellar lobe does not fold around the rear lobe, as it does in that genus. Condylopyge is long ranging, possibly spanning the early Cambrian Terreneuvian Series in Nuneaton, central England into at least Drumian strata (middle stage of the Miaolingian Series) at various locations elsewhere. Description ''Condylopyge'' is isopygous with cephalon and pygidium The pygidium (plural pygidia) is the posterior body part or shield of crustaceans and some other a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manuels River Formation
Manuels River Formation is a Middle Cambrian (Drumian) geological formation cropping out in the Random Island area of Newfoundland and elsewhere?. Its black/dark brown, finely laminated mudstones and thicker-bedded siltstones are occasionally interrupted by thin yellowish silty limestone Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms whe ... horizons. Fossil content Recorded fossils include '' Clarella venusta'' (Billings, 1872) and '' Mawddachites hicksii'' (Salter, 1864). References Geologic formations of Canada Cambrian System of North America Cambrian Newfoundland and Labrador Geology of Newfoundland and Labrador {{Canada-geology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
