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Epoch (geology)





Encyclopedia results for Epoch (geology)

  1. Geology of Georgia

    Geology of Georgia may refer to Geology of Georgia U.S. State Geology of Georgia country disambig Long comment to avoid being listed on short pages ...   more details



  1. Succession (geology)

    Unreferenced stub auto yes date December 2009 A succession , in geology, is a group of rock units or stratum strata that succeed one another in chronology chronological order. Rock successions are often easily seen on exposed sections of a geology geological column or wall. Based on uncomfortable or comfortable succession. DEFAULTSORT Succession Geology Category Geochronology Geology stub ...   more details



  1. Geology of England

    Image Geological map of Great Britain.jpg thumb 300px Geological map of Geology of the United Kingdom Great Britain , showing the differing geology of England, Geology of Scotland Scotland and Geology ... s monuments reflect its geology The Cenotaph , in Whitehall , London is made from Portland limestone The geology of England is mainly sedimentary rock sedimentary . The youngest rocks are in the south east around Geology of London London , progressing in age in a north westerly direction. ref name Southampton University http www.soton.ac.uk imw Geology Britain.htm Southampton University retrieved ... relief in those regions. The geology of England is recognisable in the landscape of its counties ... to undergo considerable Deformation geology deformation , folding the layers of rock to form ... the geology, the land has also been subject to periods of earthquake s and vulcanism volcanic activity. Superficial deposits Overlain on this bedrock geology solid geology in the terminology of the maps .... Maps showing the distribution of this drift geology are frequently produced as either separate maps, or as literal overprints on the solid geology maps. When ordering maps, this distinction should be kept in mind. Catalogues often distinguish them as S , D or S D maps. Drift geology is often more important than solid geology when considering building works, drainage, siting water boreholes, soil ... glacial deposition has had a vast impact on the geology of England covering many areas with a veneer ... geology. Palaeozoic era The Palaeozoic comprises six periods from the Cambrian to the Permian 542 ... tor s form important elements in the landscape in these areas. Metamorphism of the country rock geology ... s. ref http www.northeast geolsoc.50megs.com pages page13permiantriassic.htm Permian times by NE Geology ... deposited across central England, and in Fault geology faulted basins in Cheshire . A basin developed ... England from the Cleveland Hills of Yorkshire to the Jurassic Coast in Geology of Dorset Dorset , including ...   more details



  1. Glossary of geology

    This page is a glossary of geology . main Geology AlphanumericTOC align center nobreak numbers references ..., geological or paleontological site or artifact. Accretion geology Accretion a process ... geology competent beds. See also Boudinage . Bowen s reaction series the sequence in which minerals crystallize from a cooling basaltic magma. Fold geology Buckling Fold Buckling geology typically ..., or clasts, of pre existing rock. Cleavage geology Cleavage in structural geology and petrology, term ... part of the process of lithification. Compression geology Compression system of forces that tend ... cement fills the porosity i.e. the spaces between the sediment grains . Conglomerate geology ... periods such as the current epoch by relatively shallow seas known as shelf seas and gulfs. Convergent ... a liquid mixture of naturally occurring hydrocarbons. Crust geology Crust outermost solid shell of Earth ... Dendrites crystal that develops with a typical multi branching tree like form. Deposition geology .... Dike geology Dike or dyke a type of sheet intrusion referring to any geologic body that cuts ... formed by glacial action. Dike geology Dyke or dike a type of sheet intrusion referring to any geologic ... an earthquake or other underground explosion originates. Epoch reference date Epoch each period of the standard geologic time scale is divided into epochs e.g., Pleistocene Epoch of the Quaternary Period ... of surface water. Exfoliation geology Exfoliation the stripping of concentric rock slabs from the outer surface of a rock mass. Extension geology Extension strain involving an increase in length ... 2012 rock deformation related to shear stress Fault geology Fault discrete planar rock fracture, which shows evidence of a displacement. A fault is a discrete surface. Fault geology Fault zone zone ... mineral, such as augite, hornblende, olivine or biotite. Fold geology Fold stack of originally flat ... curvature of a fold geology fold . Hinge line a line joining the points of maximum curvature ...   more details



  1. Plating (geology)

    Sources date April 2010 In geology , plating is a hypothesized process whereby asthenosphere asthenospheric Mantle geology mantle hardens beneath Crust geology crustal material, thereby becoming attached to it and thereafter moving together with the crustal material as part of the lithosphere . A complementary process, although it does not necessarily always involve the upper mantle, is called delamination geology delamination . See also Delamination geology Ophiolite Category Plate tectonics tectonics stub ...   more details



  1. Outline of geology

    see also Index of geology articles The following outline is provided as an overview of and topical guide to geology Geology &ndash one of the Earth science s, it is the study of the Earth, with the general exclusion of present day life, flow within the ocean, and the atmosphere. The field of geology ... by which they are shaped. Geologists typically study rock geology rock , sediment , soil , river s, and natural resources . Branches of geology Geology applies primarily to Earth, but can be applied to any planet. Geology of Earth Subdisciplines of geology Economic geology Mining Mining geology Petroleum geology Engineering geology Environmental geology Geochemistry Geological modelling Geomorphology Geophysics Historical geology Hydrogeology Mineralogy Paleontology Petrology Sedimentology Stratigraphy Structural geology Volcanology Planetary geology Main Planetary geology   See also Geology of solar terrestrial planets Geology of Mercury Geology of Venus Geology of the Moon Geology of Mars Jupiter Internal structure Geology of Jupiter Saturn Physical characteristics Geology of Saturn Uranus Physical characteristics Geology of Uranus Neptune Physical characteristics Geology of Neptune Principles of geology Principle of intrusive relationships Principle of cross cutting ... succession History of geology Main article History of geology Geological history of Earth Timeline of geology General geology concepts Geologic provinces Image World geologic provinces.jpg thumb 300px ... Geologic province s legend f96 Shield geology Shield legend f9c Continental platform Platform legend 9fc Orogeny Orogen legend 9cf Basin geology Basin legend 969 Large igneous rock igneous province legend ff9 Extended crust geology crust border dc8 main Geologic province Geologic provinces based on origin Shield geology Shield Platform geology Platform shield covered with sediment Orogen Island ... Extended Crust geology crust Rifted margin Rift Plate tectonics main Plate tectonics Occupations in Geology ...   more details



  1. Trough (geology)

    Unreferenced date September 2009 In geology, a trough generally refers to a linear structural geology structural depression that extends laterally over a distance, while being less steep than a oceanic trench trench . A trough can be a narrow Basin geology basin or a geologic rift . There are various oceanic troughs , troughs found under ocean s examples include the rift along the mid oceanic ridge and the Cayman Trough . See also Walker Lane DEFAULTSORT Trough Geology Category Geomorphology Category Geology terminology Category Landforms geology stub ko kk ja simple Trough geology zh ...   more details



  1. Hoodoo (geology)

    in the U.S. state of Utah see geology of the Bryce Canyon area . Hoodoos are a tourist attraction .... The stones formed as the seabed rose rapidly out of the ocean during the Miocene epoch. ref http ... of iconic specimens in Wanli, Taiwan Wanli . Formation within volcanic rocks The geology of areas ..., the Geology of Bryce Canyon National Park . Bryce Canyon Natural History Association. Kiver, Eugene P., Harris, David V. 1999. Geology of U.S. Parklands 5th ed . John Wiley & Sons, Inc. 522 528. Sprinkel, Douglas A., Chidsey, Thomas C. Jr., Anderson, Paul B. 2000. Geology of Utah s Parks and Monuments ... hoodoos.htm National Park Service Bryce Canyon National Park Nature and Geology Hoodoos ... wide DEFAULTSORT Hoodoo Geology Category Rock formations Category Erosion landforms Category Geology ...   more details



  1. Flood geology

    , Epoch geology epochs , and faunal stages characterized by well defined breaks in the fossil record ... before making substantial changes. creationism2 Flood geology also creation geology or diluvial geology is the interpretation of the geological history of the Earth in terms of the flood myth global flood described in Book of Genesis Genesis 6 9 . Similar views played a part in the History of geology early development of the science of geology , even after the Ussher chronology Biblical chronology had been rejected by geology geologists in favour of an ancient Earth. In the contemporary literature, flood geology is a field of study within creation science , which is an integral part of young .... Flood geology contradicts the scientific consensus in geology and paleontology , sfn Delgado 2006 ... ref History of flood geology File Noahs Ark.jpg thumb Animals boarding Noah s ark Edward Hicks, 1846 painting The great flood in the history of geology Many early Christians, including Tertullian ... science of history of geology geology was founded in Europe in the 18th century. ref The world ... Society of London , founded in 1807 the term geology itself was popularized through its use in the Encyclopedie ... famous chronology . In 1823 the Reverend William Buckland , the first professor of geology .... ref harvnb Imbrie Imbrie 1986 p 40 ref Mainstream science abandoned the idea of flood geology that required major deviations from present physical processes. Reemergence of flood geology Flood geology was developed as a creationist endeavor in the 20th century by George McCready Price , a Seventh ... perspective on geology. ref harvnb Price 1926 p ref ref harvnb Numbers 2006 ref Price s work was subsequently ... was supportive of religious and scientific dissent from flood geology. ref name radio J. Laurence ... flood geology but to allow members to follow the scientific evidence rather than a literalist ... 2009 01 12 ref Kulp also wrote a detailed critique of Flood Geology, titled Deluge Geology ...   more details



  1. Melanosome (geology)

    Unreferenced date November 2009 A melanosome in geology refers to the dark, mafic mineral bands formed in migmatite which is undergoing eutaxitic melting probably to form granite . These form bands with leucosome s and such a texture may be described as schlieren or migmatitic . See also Metamorphism References http www.whitman.edu geology winter Petrology Ch 2022 20Metamorphic 20Classification.ppt metamorphic rock classification DEFAULTSORT Melanosome Geology Category Petrology geology stub ...   more details



  1. Sequence (geology)

    Unreferenced stub auto yes date December 2009 A sequence in geology refers to a sequence of geological events, processes, or rocks, arranged in chronology chronological order. A rock stratigraphy stratigraphical sequence is a geography geographical , or lithology lithostratigraphic , discrete unit greater than a Group stratigraphy group or supergroup rank, and traceable over large areas of a continent. A stratigraphic sequence is bounded by Unconformity unconformities of inter region al scope, such as in the division of craton s. DEFAULTSORT Sequence Geology Category Stratigraphy Category Geology terminology Geology stub ...   more details



  1. Lens (geology)

    Unreferenced stub auto yes date December 2009 In geology a lens is a body of ore or Rock geology rock or a deposit that is thick in the middle and thin at the edges, resembling a convex lens in cross section. Adjective lenticular . A lens can also refer to an irregular shaped formation consisting of a porous , Permeability fluid permeable sedimentary deposit surrounded by impermeable rock. DEFAULTSORT Lens Geology Category Petrology Category Sedimentology Geology stub it Lente geologia pt Lente geologia uk ...   more details



  1. The Journal of Geology

    Infobox Journal cover File The Journal of Geology.gif discipline Geology abbreviation J. Geol. publisher University of Chicago Press country United States history 1893 present frequency Bimonthly website http www.journals.uchicago.edu JG ISSN 0022 1376 The Journal of Geology publishes research on geology , geophysics , geochemistry, sedimentology, geomorphology, petrology , plate tectonics , volcanology , structural geology, mineralogy , and planetary sciences. Its content ranges from planetary evolution to computer modeling of fossil development, making it relevant to geologists as well as other researchers working in the Earth or planetary sciences. External links Official http www.journals.uchicago.edu JG DEFAULTSORT Journal Of Geology, The Category English language journals Category Bimonthly journals Category University of Chicago Press academic journals Category Publications established in 1893 Category Geology journals Science journal stub es The Journal of Geology pt The Journal of Geology ...   more details



  1. Sulcus (geology)

    Sulcus plural sulci is, in astrogeology, a long parallel groove on a planet or a moon. For example, Uruk Sulcus is a bright region of grooved terrain adjacent to Galileo Regio on Jupiter s moon Ganymede moon Ganymede . References reflist Category Geology geology stub ...   more details



  1. Medical geology

    Medical geology is an emerging interdisciplinary scientific field studying the relationship between natural geology geological factors and their effects on human and animal health . ref http www.bgs.ac.uk research environmentAndHealth mg.html British Geological Survey. Medical Geology. ref In its broadest sense, medical geology studies exposure to or deficiency of trace elements and minerals inhalation of ambient and anthropogenic mineral dusts and volcanic emissions transportation, modification and concentration of organic compounds and exposure to radionuclide s, microbes and pathogens. ref Finkelman, R.B., Skinner, H. C. W., Plumlee G. S. & Bunnell, J. E. 2001. Medical Geology. Geotimes. http www.agiweb.org geotimes nov01 feature medgeo.html ref Examples of research in medical geology include Studies on the impact of contaminant mobility as a result of extreme weather events such as flooding . Lead and other Heavy metals heavy metal exposure resulting from dust and other particulates Asbestos exposure such as amphibole asbestos dusts in Libby, Montana Fungal infection resulting from airborne dust, such as Valley Fever or coccidioidomycosis References Reflist http energy.er.usgs.gov health environment medical geology USGS Medical Geology Accessed 22 July 2006 http www.agiweb.org geotimes nov01 feature medgeo.html Medical Geology Geotimes Nov. 2001 accessed 28 January 2006 http energy.er.usgs.gov projects Medical Geology ecohealth emerging.pdf Bunnell, Joseph E. 2004 Medical Geology Emerging Discipline on the Ecosystem Human Health Interface , Ecohealth PDF file accessed 28 January 2007 External links http www.medicalgeology.org International Medical Geology Association Use dmy dates date September 2010 DEFAULTSORT Medical Geology Category Geology Category Interdisciplinary fields Category Environmental health Med stub Geology stub es Geolog a m dica pt Geologia m dica sv Medicinsk geologi vi a ch t y h c ...   more details



  1. Geology of Wales

    rocks red patches. The geology of Wales is complex and varied its study has been of considerable historical significance in the development of History of geology 19th century geology as a science . All ... of two mountain building episodes have left their mark in the fault geology faulting and fold geology ... geology influences farming practices and building stone choices but also planning of developments ... of the geology can help deal with. History of geological study Geology of South Wales South ... Murchison and Adam Sedgwick used their studies of the geology of Wales to establish certain principles ... fault geology faulted relationship to neighbouring rocks has meant that geologists ... where the anticline up arched rocks of the Rhinogydd geology Harlech Dome form the Rhinogydd Rhinogs ... Orogeny . A notable feature of the Ordovician system is a major Depression geology downwarp ... gives rise to the Usk Inlier . In the north it is the Ludlow epoch Ludlow age mudstones and sandstones ... and Wenlock epoch Wenlockian Denbigh Grits which form the Mynydd Hiraethog Denbigh Moors , ref British ... and between Marloes and Daugleddau are formed by Llandovery epoch Llandovery aged mudstones, sandstones ... were laid down during the Westphalian Geological Series or Epoch reference date epoch approximately .... In the south, poorly cementation geology cemented sands occur sporadically in the central and western ... British Regional Geology Wales , British Geological Survey, Keyworth, Notts map p184 & text p194 ... Severn Severn valley . ref Howells, M.F. 2007 British Regional Geology Wales , British Geological ... , Dan yr ogof partly showcave and Wales most extensive system Ogof Draenen . Economic geology Metals .... & Barclay W. 2002 Geology and building stone in Wales south . British Geological Survey ISBN 0852724225 .... Charities such as Wales wildlife trusts also have a similar role. See also Geology of the British Isles Geology of England Geological groups of Great Britain Geological structure of Great Britain Geology ...   more details



  1. Geology of Gloucestershire

    Image EnglandGloucestershire.png thumb Gloucestershire Gloucestershire is one of the most geology geologically and scenically diverse counties in England , with rocks from the Precambrian through to the Jurassic represented. These varying rock types are responsible for the three major areas of the county, each with its own distinctive scenery and land use the Forest of Dean in the west, bordering Wales , the Cotswolds in the east, and in between, the Severn Vale. Forest of Dean The Forest of Dean , situated between the rivers Severn and River Wye Wye , is formed of a raised basin of palaeozoic rocks folded in the Variscan Orogeny , similar to the South Wales coalfield to the west. Underlain by great thicknesses of the Old Red Sandstone , the basin is filled with Carboniferous limestones, sandstones and Forest of Dean Coalfield coal measures all of which have contributed to the industrial history of the region. Sometimes called the prettiest coal field in Britain , the Forest s main coal output was in the 18th, 19th and early 20th centuries, although for hundreds of years coal has been won in the area via free mines , which could only be operated by local people known as Freeminer s. One or two survive today. Small scale mining has been enabled by the exposed nature of the coalfield, with seams often outcropping at surface. Iron ore has been extracted from labyrinthine mines or Scowles .... A high degree of faulting complicates the geology of the May Hill area, causing outcrops of Wenlock epoch Wenlock limestone and Downton Castle sandstone on its flanks, as well as a possibly Precambrian section of the core of the hill exposed at Huntley quarry. The hilltop is of Llandovery epoch Llandovery ... west Gloucestershire . See also Geology of the UK Gloucestershire Forest of Dean Forest of Dean Coalfield Cotswolds External links http www.glosgeotrust.org.uk Gloucestershire Geology Trust Category Geology of Gloucestershire Category Geography of Gloucestershire ...   more details



  1. Compression (geology)

    Unreferenced date December 2007 In geology the term compression refers to a set of stresses directed toward the center of a rock mass. Compressive strength refers to the maximum compressive stress that can be applied to a material before failure occurs. When the maximum compressive stress is in a horizontal orientation, thrust fault ing can occur, resulting in the shortening and thickening of that portion of the crust geology crust . When the maximum compressive stress is vertical, a section of rock will often fail in normal fault s, horizontally extending and vertically thinning a given layer of rock. Compressive stresses can also result in fold geology folding of rocks. Because of the large magnitudes of lithostatic stress in tectonic plate s, tectonic scale deformation geology deformation is always subjected to net compressive stress. See also Gravitational compression Category Structural geology Category Geology terminology geology stub ca Compressi mec nica ...   more details



  1. Environmental geology

    Environmental geology , like hydrogeology , is an applied science concerned with the practical application of the principles of geology in the solving of environmental problems. It is a multidisciplinary field that is closely related to engineering geology and, to a lesser extent, to environmental geography . Each of these fields involves the study of the interaction of humans with the geologic environment, including the biosphere , the lithosphere , the hydrosphere , and to some extent the Earth s atmosphere atmosphere . Environmental geology includes managing geological and hydrogeological resources such as fossil fuel s, mineral s, water molecule water surface and ground water , and land use . studying the earth s surface through the disciplines of geomorphology , and edaphology defining and mitigating exposure of natural hazards on humans managing industrial and domestic waste disposal and minimizing or eliminating effects of pollution , and performing associated activities, often involving litigation. A peer reviewed journal in the field is Environmental Earth Sciences ISSN 1866 6280 , ref Cite web title Environmental Earth Sciences publisher Springer url http www.springer.com earth sciences and geography geology journal 12665 accessdate 2010 08 31 ref formerly Environmental Geology ISSN 0943 0105 . See also Soil contamination References references External links Dead link date June 2010 http www.ela iet.com el00002.htm Definition of environmental geology Category Geology Category Environmental science Geology stub es Geolog a ambiental id Geologi lingkungan it Geologia ambientale no Milj geologi nn Milj geologi sk Environment lna geol gia vi a ch t m i tr ng zh ...   more details



  1. Andean Geology

    Infobox journal cover File Tapa1a.png discipline Geology , Earth sciences abbreviated title noeffect abbreviation ANDGEO language English, Spanish publisher SERNAGEOMIN country Chile publication history noeffect history 1974 present frequency 3 times a year from 2012 website http www.andeangeology.cl ISSN 0716 0208 eISSN 0717618x OCLC Andean Geology formerly Revista Geol gica de Chile is a scientific journal published by Servicio Nacional de Geolog a y Miner a , Chile s geology and mining agency. It contains articles that are published in the field of geology and related earth science s, primarily on issues that are relevant to South America , Central America and Antarctica with a particular focus on the Andes . ref name autores cite web title Instrucciones a Los Autores url http www.andeangeology.cl index.php revista1 about submissions work Andean Geology publisher SERNAGEOMIN accessdate 9 November 2011 ref The published articles include peer reviewed original and review scientific research papers. ref name autores The journal is published three times a year January, May and September in both English and Spanish. ref name autores References Reflist geology of Chile Use dmy dates date January 2012 Category Geology journals Category Chilean magazines Category Geology of Chile Category Publications established in 1974 Category Andes Category Spanish language journals Geology stub Chile stub ...   more details



  1. Geology of Oklahoma

    The geology of Oklahoma is characterized by Carboniferous rocks in the east, Permian rocks in the center and towards the west, and a cover of Tertiary deposits in the pan handle to the west. Cretaceous sediments are found in the south east. There are also some areas with older outcrops dating back to Cambrian , and even one area of Precambrian igneous rocks. Source http www.ogs.ou.edu earthscience intgeol index.php Oklahoma Geological Survey U.S. Geological Survey Oklahoma Digital Geologic Map Database http pubs.usgs.gov of 2003 ofr 03 247 OK map.pdf 19 MB . United States topic title Geology of the United States by political division prefix Geology of Category Geology of Oklahoma US geology stub ...   more details



  1. Geology of Greenland

    Greenland is the largest island on Earth . Only one fifth of its surface area is exposed bedrock , the rest being covered by ice . The exposed surface is approximately 410,000 km sup 2 sup . Its geology is dominated by crystalline Rock geology rocks of the Precambrian Shield . ref name geus http www.geus.dk program areas raw materials greenl map greenland gr map anhstart uk.htm Greenland Geology. Geological Survey of Denmark and Greenland . 20 June 2003 retrieved 26 Dec 2010 ref There are large deposits of Rare earth element rare earth oxides at Kvanefjeld . See also Gemstone industry in Greenland Notes reflist Category Geology of Greenland Greenland stub regional geology stub no Gr nlands geologi ...   more details



  1. Striation (geology)

    Image Striation fault.jpg thumb Striations observed in Peloponnese , Greece . Image PySlick.JPG thumb left Slickenside striations on a Pyrite coated fault surface In geology, a striation means linear furrows generated from Fault geology fault movement The striation s direction reveal the movement directions in the fault plane. Similar striations can occur with glaciation . Striations can also be a growth pattern shown on certain faces of certain minerals. Minerals that can include growth striations include Pyrite , Feldspar , Quartz , Tourmaline , and Sphalerite . See also Glacial striation DEFAULTSORT Striation Geology Category Geology geology stub ...   more details



  1. Eduction (geology)

    File Tibetan rocky land.JPG thumb 300px Tibet an rocky land, likely a result of combined eduction and erosion . In geology, eduction is a process in which the Earth crust spreads sideways, exposing deep seated rocks. It is prominent in middle layers of the Himalayas , where gravity pushes the mountains down. Together with a high grade of erosion, this activity brings deep rocks to the surface, many from more than a depth of 100  km. The unusually fast elevation preserves rare metastable minerals , e.g. diamonds and coesite . ref http geology.about.com od structureslandforms a tibetanplat.htm The Tibetan Plateau By Andrew Alden, About.com. Retrieved on April 12, 2009 ref See also Desert pavement , describing other forms of surface rock formation. References reflist DEFAULTSORT Eduction Geology Category Geology Category Geology terminology geology stub ...   more details



  1. Cape Geology

    Cape Geology coord 77 0 S 162 32 E source GNIS is a low, gravel covered point marking the western limit of Botany Bay Victoria Land Botany Bay , in the south part of Granite Harbour , Victoria Land , Antarctica. It was charted and named by the Western Geological Party of the British Antarctic Expedition, 1910 13 , who established their base here. ref name gnis References Reflist refs ref name gnis cite gnis type antarid id 5588 name Geology, Cape accessdate 2012 04 19 ref usgs gazetteer id 5588 name Geology, Cape DEFAULTSORT Geology, Cape Category Headlands of Victoria Land Category Scott Coast ScottCoast geo stub no Cape Geology ...   more details




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