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Palaeoglomus
''Palaeoglomus'' ("ancient ball") is a genus of microscopic mycorrhizal fossil, found in palynological preparations of rocks which separate out organic remains by acid dissolution. Description ''Palaeoglomus'' has large spherical to ellipsoidal spores with multilayered walls, as well as irregularly shaped vesicles, attached to aseptate hyphae. Species ''Palaeoglomus grayi'' type species from the Middle Ordovician Guttenberg Formation near Platteville, Wisconsin. ''Palaeoglomus boullardi'' from the Early Devonian Rhynie Chert bear Rhynie, Scotland. ''Palaeoglomus strotheri'' from the Middle Ordovician (Darriwilian, 460 million years old) Douglas Lake Member The Douglas Lake Member is a geologic unit of member rank of the Lenoir Limestone that overlies the Mascot Dolomite and underlies typical nodular member of the Lenoir Limestone in Douglas Lake, Tennessee, region. It fills depressions that are ... of the Lenoir Limestone from Douglas Dam, Tennessee. Biological af ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glomerales
Glomerales is an order of symbiotic fungi within the phylum Glomeromycota. Biology These fungi are all biotrophic mutualists. Most employ the arbuscular mycorrhizal method of nutrient exchange with plants. They produce large (.1-.5mm) spores ( azygospores and chlamydospores) with thousands of nuclei. Phylogeny All members of their phylum were once thought to be related to the Endogonaceae, but have been found through molecular sequencing data, to be a closer relation to the Dikarya. Their fossil record extends back to the Ordovician The Ordovician ( ) is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. ... period (460 million years ago). Orthography The family name Glomeraceae upon which this order level name is based, was incorrectly spelled 'Glomaceae', hence the order name was incorr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Douglas Lake Member
The Douglas Lake Member is a geologic unit of member rank of the Lenoir Limestone that overlies the Mascot Dolomite and underlies typical nodular member of the Lenoir Limestone in Douglas Lake, Tennessee, region. It fills depressions that are part of a regional unconformity at the base of Middle Ordovician strata, locally the Lenoir Limestone, that separates them from the underlying Lower Ordovician strata, locally the Knox Group.U.S. Geological Survey, 2020Geologic Unit: Douglas Lake Walker, K.R., Steinhauff, D.M., and Roberson, K.E., 1992. ''Uppermost Knox Group, the Knox unconformity, the Middle Ordovician transition from shallow shelf to deeper basin at Dandridge, Tennessee'', In Driese, S.G., and others, eds., ''Paleosols, paleoweathering surfaces, and sequence boundaries'', ''University of Tennessee, Department of Geological Scienc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Platteville, Wisconsin
Platteville is the largest city in Grant County in southwestern Wisconsin. The population was 11,836 at the 2020 census, up from 11,224 at the 2010 census. Much of this growth is likely due to the enrollment increase of the University of Wisconsin–Platteville. It is the principal city of the Platteville Micropolitan Statistical area, which has an estimated population of 49,681. Platteville is located atop the greater Platte River valley in the southern Driftless Region of Wisconsin, an area known for its karst topography and rolling hills. History Platteville was settled by pioneers and early lead miners along inlets and flat groves of The Rountree Branch and Platte River, which form part of the greater Upper Mississippi River system in the southwest Driftless Region of Wisconsin. Areas of town are carved by ridges, narrow valleys, and steep hills. The influence of geography can also be seen in the irregularity of the streets in the community. As the town grew ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossils Of Tennessee
Paleontology in Tennessee refers to paleontological research occurring within or conducted by people from the U.S. state of Tennessee. During the early part of the Paleozoic era, Tennessee was covered by a warm, shallow sea. This sea was home to brachiopods, bryozoans, cephalopods, corals, and trilobites. Tennessee is one of the best sources of Early Devonian fossils in North America. During the mid-to-late Carboniferous, the state became a swampy environment, home to a rich variety of plants including ferns and scale trees. A gap in the local rock record spans from the Permian through the Jurassic. During the Cretaceous, the western part of the state was submerged by seawater. The local waters were home to more fossil gastropods than are known from anywhere else in the world. Mosasaurs and sea turtles also inhabited these waters. On land the state was home to dinosaurs. Western Tennessee was still under the sea during the early part of the Cenozoic. Terrestrial portions of the st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glomus (fungus)
''Glomus'' is a genus of arbuscular mycorrhizal (AM) fungi, and all species form symbiotic relationships ( mycorrhizae) with plant roots. ''Glomus'' is the largest genus of AM fungi, with ''ca.'' 85 species described, but is currently defined as non-monophyletic. Classification ''Glomus'' is one of the genera in the family Glomeraceae, in the division Glomeromycota. Some members of the genus were originally described as ''Sclerocystis'' species, but this genus has been entirely transferred to ''Glomus''. However, further taxonomic changes are likely as the phylogeny of AM fungi becomes better understood. ''Glomus'' is likely related to the fossil fungus '' Glomites'', discovered in the Rhynie chert deposits from the Early Devonian (400 million years ago). Ecology As with other AM fungi, all ''Glomus'' species are thought to be obligate symbionts, dependent on their mycorrhizal association with plant roots to complete their life cycle. They cannot be cultured in the laboratory ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Darriwilian
The Darriwilian is the upper stage of the Middle Ordovician. It is preceded by the Dapingian and succeeded by the Upper Ordovician Sandbian Stage. The lower boundary of the Darriwilian is defined as the first appearance of the graptolite species ''Undulograptus austrodentatus'' around million years ago. It lasted for about 8.9 million years until the beginning of the Sandbian around million years ago. This stage of the Ordovician was marked by the beginning of the Andean-Saharan glaciation. Naming The name Darriwilian is derived from Darriwil, a parish in County of Grant, Victoria (Australia). The name was proposed in 1899 by Thomas Sergeant Hall. GSSP The GSSP of the Darriwilian is the Huangnitang Section () near the village Huangnitang, 3.5 km southwest of Changshan County Town (Zhejiang, China). It is an outcrop of the Ningkuo Formation, consisting of mainly black shale. The lower boundary of the Darriwilian is defined as the first appearance datum of the grapto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scotland
Scotland (, ) is a country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a border with England to the southeast and is otherwise surrounded by the Atlantic Ocean to the north and west, the North Sea to the northeast and east, and the Irish Sea to the south. It also contains more than 790 islands, principally in the archipelagos of the Hebrides and the Northern Isles. Most of the population, including the capital Edinburgh, is concentrated in the Central Belt—the plain between the Scottish Highlands and the Southern Uplands—in the Scottish Lowlands. Scotland is divided into 32 administrative subdivisions or local authorities, known as council areas. Glasgow City is the largest council area in terms of population, with Highland being the largest in terms of area. Limited self-governing power, covering matters such as education, social services and roads and transportation, is devolved from the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhynie, Aberdeenshire
Rhynie () ( gd, Roinnidh) is a village in Aberdeenshire, Scotland. It is on the A97 road, northwest of Alford. The Rhynie Chert is named after the village as well as the fossil plant genus '' Rhynia''. The Rhynie Chert is a sediment deposited in the Devonian period, a specimen of which contained the oldest fossil insect in the world (''Rhyniognatha hirsti''). The missionary, teacher and chocolatier Alexander Murdoch Mackay was born in Rhynie on 13 October 1849. Etymology The name ''Rhynie'' may involve an early Pictish ''rīg'' meaning "a king" (c.f. Gaelic ''ríg/rí''; c.f. Welsh ''rhi''). History Eight Pictish symbol stones have been found at Rhynie, including the "Rhynie Man", a tall boulder carved with a bearded man carrying an axe, possibly a representation of the Celtic god Esus, that was discovered in 1978. The "Rhynie Man" now stands inside Woodhill House (the headquarters of Aberdeenshire Council ) in Aberdeen. In 2011 archaeological excavations at Rhynie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhynie Chert
The Rhynie chert is a Lower Devonian sedimentary deposit exhibiting extraordinary fossil detail or completeness (a Lagerstätte). It is exposed near the village of Rhynie, Aberdeenshire, Scotland; a second unit, the Windyfield chert, is located some 700 m away. The Rhynie chert contains exceptionally preserved plant, fungus, lichen and animal material preserved in place by an overlying volcanic deposit. The bulk of the Devonian fossil bed consists of primitive plants (which had water-conducting cells and sporangia, but no true leaves), along with arthropods, lichens, algae and fungi. This fossil bed is remarkable for two reasons. First, the age of the site (Pragian, Early Devonian, formed about ) places it at an early stage in the colonisation of land. Second, these cherts are famous for their exceptional state of ultrastructural preservation, with individual cell walls easily visible in polished specimens. Stomata have been counted and lignin remnants detected in th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Devonian
The Early Devonian is the first of three epochs comprising the Devonian period, corresponding to the Lower Devonian series. It lasted from and began with the Lochkovian Stage , which was followed by the Pragian from and then by the Emsian, which lasted until the Middle Devonian began, . During this time, the first ammonoids appeared, descending from bactritoid nautiloids. Ammonoids during this time period were simple and differed little from their nautiloid counterparts. These ammonoids belong to the order Agoniatitida, which in later epochs evolved to new ammonoid orders, for example Goniatitida and Clymeniida. This class of cephalopod molluscs would dominate the marine fauna until the beginning of the Mesozoic The Mesozoic Era ( ), also called the Age of Reptiles, the Age of Conifers, and colloquially as the Age of the Dinosaurs is the second-to-last era of Earth's geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceo ... Era. Reference ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. The Ordovician, named after the Welsh tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were placing the same rock beds in North Wales in the Cambrian and Silurian systems, respectively. Lapworth recognized that the fossil fauna in the disputed strata were different from those of either the Cambrian or the Silurian systems, and placed them in a system of their own. The Ordovician received international approval in 1960 (forty years after Lapworth's death), when it was adopted as an official period of the Paleozoic Era by the International Geological Congress. Life continued to flourish during the Ordovician as it did in the earlier Cambrian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
