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Topic: Period (geology)

  Period (geology) - Wikipedia, the free encyclopedia
A geologic period is a subdivision of geologic time that divides Eras into smaller timeframes.
Periods are considered an informal designation but are still used to demarcate rock layers and the fossil record.
While paleontologists often refer to faunal stages rather than geologic periods, they are often used in popular presentations of paleontology.
en.wikipedia.org /wiki/Geologic_period   (88 words)

The periods are generally named after the regions where rocks of the period in question are well exposed; for example, the Permian period is named after the European province of Perm in Russia.
This major branch of geology is geared to the analysis, exploration, and exploitation of geological materials of use to humans, such as fuels, metals and non-metallic minerals, water, and geothermal energy.
The scope of environmental geology is exceptionally broad, comprising as it does physical sciences such as geochemistry and hydrology, as well as biological and social sciences, and engineering.
mi6dossier.tripod.com /geology.htm   (3116 words)

 USGS Paleontology - Glossary of Terms   (Site not responding. Last check: 2007-10-29)
The branch of geology concerned with the separation and differentiation of rock units by means of the study of the fossils they contain.
This interval predates the period of true geologic time since no rocks of this age are known on Earth, with the exception of a few meteorites.
The period of time, also known as an eon, between the end of the Precambrian and today, The Phanerozoic begins with the start of the Cambrian period, 544 million years ago.
geology.er.usgs.gov /paleo/glossary.shtml   (2386 words)

 Period - Wikipedia, the free encyclopedia
full stop, also known as a period, that marks the end of a sentence
In a group, the period of an element a is the smallest integer n such that a
In physics, a period is an interval of time between the recurrence of phases in a vibration, etc.
en.wikipedia.org /wiki/Period   (129 words)

 Undergraduate Geology Programs at TCU
The B.A. degree with a major in Geology is devised primarily for the student seeking a curriculum combining geology with another field of study.
Geology majors who plan to pursue Departmental Honors must be members of the Honors Program and should enroll in GEOL 30003 during their junior year and GEOL 40013 during the fall semester of their senior year.
The workings of science and scientists considered by examining the emergence of geology as a science in the late 18th and early and early 19th centuries and its development through the Victorian Age, including the rise and demise of scriptural geology and the impact of geologic thought on social mores and religious beliefs.
geowww.geo.tcu.edu /geoprog.html   (1870 words)

 geology   (Site not responding. Last check: 2007-10-29)
Barry Setterfield is well-studied in geology and has some information for those who are curious about the concept of a young earth creationist point of view and the geological record.
Further explanations of the geology as it relates to a young creation on the Setterfield Vc model is in the article "A Brief Earth History."
The redshift data reveal that the bulk of this decay has occurred over a 3000 year period during which predicted radiometric ages dropped from 14 billion years down to a few thousand years on the atomic clock.
setterfield.org /geology.htm   (1577 words)

 ISGS - Glacial Geology
Glacial geology is important in Illinois' most recent geologic past, the Quaternary Period (also called the Ice Age), during which continental glaciers repeatedly plowed across the state eroding and redistributing material and creating new landforms.
Today, Illinois is experiencing an interglacial episode, a relatively quiescent and warm interval of the Quaternary Period that allows the soil to form and crops to grow.
Quaternary geology encompasses both the cold and warm intervals and the glacial and nonglacial processes of the past 2 million years.
www.isgs.uiuc.edu /isgshome/glacial.htm   (83 words)

 Natural history - Minnesota's geology - SNAs: Minnesota DNR
The best evidence of this period lies in southeastern Minnesota, where fossils of early marine plant and animal life abound in sandstone, limestone, and shale formations.
During colder periods, it extended southward across the upper midwest in what are called glaciations, each named for a geographic area: Nebraskan, Kansan, Illinoian, and Wisconsin.
The flatness of southwestern Minnesota, with its Blue Mounds quartzite outcrops, is another example of the driftless area that escaped the Wisconsin glaciation.
www.dnr.state.mn.us /snas/naturalhistory.html   (2512 words)

 Geology of Ohio--The Silurian
Warm, shallow seas dominated the state from the beginning of the period about 438 million years ago until the end of the period about 408 million years ago.
Generalized paleogeographic map of Ohio and adjacent areas illustrating the distribution and relationship of Silurian reefs and platforms developed during the middle part of the Silurian Period and areas of Late Silurian accumulation of evaporites.
By the middle part of the Silurian Period the Late Ordovician Taconic Mountains had been reduced by erosion and furnished very little clastic sediment to the Ohio portion of the Appalachian Basin.
www.ohiodnr.com /geosurvey/oh_geol/98_spring/silurian1.htm   (425 words)

 AllRefer.com - Silurian period (Geology And Oceanography) - Encyclopedia
Silurian period[siloor´Eun, sI–] Pronunciation Key [from the Silures, ancient tribe of S Wales, where the period was first studied; named by the British geologist R. Murchison], third period of the Paleozoic era of geologic time (see Geologic Timescale, table) lasting from 405 to 435 million years ago.
The continents in the Silurian period remained much as they had been in the preceding Ordovician period, with approximately the same areas being subject to flooding by shallow seas.
The Medina sandstone extending from New York to Alabama has been assigned to both periods but is generally considered to be Silurian.
reference.allrefer.com /encyclopedia/S/Silurian.html   (501 words)

 NPS: Nature & Science» Geology Resources Division   (Site not responding. Last check: 2007-10-29)
Sandstone of the Triassic period (210 million years ago), the Navajo Sandstone of the Triassic and Jurassic (145 million years ago) periods, and the Entrada Sandstone of the Jurassic period.
The park's geology may be described in regional or state geology texts.
Please visit the Geology Books and Media webpage for additional sources such as text books, theme books, CD ROMs, and technical reports.
www2.nature.nps.gov /geology/parks/arch   (5533 words)

 Handbook of Texas Online: GEOLOGY   (Site not responding. Last check: 2007-10-29)
During the early phase of the Ouachitan tectonic cycle in the Cambrian Period of the early Paleozoic, rifting of the southern margin of the ancient North American continent led to the development of a marine basin to the southeast, along with several failed rift basins, which are elongated troughs extending inland from the continental margin.
By the Permian Period, at the end of the Paleozoic Era, the inland seas were gradually withdrawing from the West Texas subbasins, leaving behind shallow basins rimmed by extensive tidal flats and containing highly evaporative bodies of water in which salt, gypsum, and red muds accumulated in a hot, dry climate.
Jurassic and Cretaceous deposits formed broad carbonate shelves that were periodically buried in places by deltaic sandstones and shales at the edge of the widening Gulf of Mexico.
www.tsha.utexas.edu /handbook/online/articles/view/GG/swgqz.html   (2381 words)

 Geology of South Dakota
The scientific study of South Dakota's geology is ongoing.
Geology of the Black Hills, South Dakota and Wyoming edited by F.J. Rich, 1985.
Geology Department, S.D. School of Mines and Technology, Rapid City, SD 57701.
www.northern.edu /natsource/EARTH/Geolog1.htm   (1514 words)

 Geology of Iceland
Subglacial volcanic eruptions periodically cause large meltwater floods known as jökulhlaups.
Iceland (874AD) and Greenland (985AD) were colonized during a period of high solar output known as the Medieval Warm Period that reached a maximum around 1000AD.
The Little Ice Age from 1560 to 1890AD was a period of cold and severe winters and short and wet summers.
www.lonker.net /nature_geology_3.htm   (489 words)

 Carboniferous period   (Site not responding. Last check: 2007-10-29)
Carboniferous period: Historical Geology of the Period - Historical Geology of the Period The Carboniferous period was marked by vast, coal-forming swamps...
Carboniferous period: Evolution of Plant and Animal Life - Evolution of Plant and Animal Life The plant life of the Carboniferous period was extensive and...
Table of Geological Periods - It is generally assumed that planets are formed by the accretion of gas and dust in a cosmic cloud,...
www.infoplease.com /ce6/sci/A0810374.html   (179 words)

 Geological History of Orange County   (Site not responding. Last check: 2007-10-29)
The Bedford Canyon Formation was subjected to long periods of erosion, then it was submerged and younger sediments were deposited upon it.
The Trabuco Formation is the earliest Cretaceous Period formation to be found in Orange County.
It is exciting to study the rocks of this period because we see, as we enter this period, continental deposits and a semi-arid land, which then begins to subside as shallow seas slowly cover the alluvial fans with marine sandstone, beach cobbles, and sea shells.
www.ivc.edu /academics/physical_sciences/geology/ocgeo.aspx   (2814 words)

 Problems with a Global Flood, 2nd edition
They thus seem to require at least two periods of deposition (more, where there is more than one unconformity) with long periods of time in between to account for the deformation, erosion, and weathering observed.
Geology of the Himalayas, John Wiley and Sons, Ltd., New York.
What it does attempt to explain is already explained far more accurately, consistently, and thoroughly by conventional geology and biology, and the flood model leaves many other things unexplained, even unexplainable.
www.talkorigins.org /faqs/faq-noahs-ark.html   (9127 words)

 cretaceous period - infos
The Cretaceous period was the heyday of the dinosaurs and ended with a bang!.
The Cretaceous Period The Cretaceous Period This resource discusses notable facts about the Cretaceous Period, the last portion of the "Age of Dinosaurs".
During the Cretaceous period the massive continents of Gondwanaland and Laurasia continued...
www.angelfire.com /alt2/ang3/7/cretaceous-period.html   (276 words)

 Geology 101 - THE EARTH - Fall 2000
During the first 30 minutes of the exam period you will answer the questions yourself, without using books or notes, and turn your answer sheet in.
You will then have the rest of the 50 minute exam period (20 minutes) to take the exam a second time, during which you may consult with your neighbors and your book and notes.
Laboratory work will be tested in the laboratory periods and grades for it reported as a separate class.
www.geo.umass.edu /courses/geo101   (1079 words)

 ECB Surf Report: Geology   (Site not responding. Last check: 2007-10-29)
The Geology Wing at the University of California-Berkeley Museum of Paleontology is an online exhibit that journeys through Earth's geologic history to explore stratigraphy, life, fossils, and tectonics of various time periods.
Geology Labs Online, from California State University, offers Web-based lab activities to enhance high school and college learning of geology and other earth sciences.
Geology of Mammoth Cave surveys the geology of the longest cave in the world, located in Kentucky.
www.ecb.org /surf   (1048 words)

 Geology of Missouri
Many books have been written about Missouri Geology in the 300 years since the first European saw the glint of galena (lead sulfide) and mistook it for silver.
If you are a geology student, you may notice that three geological periods are missing in this lineup from oldest to youngest--with a large gap after the Pennsylvanian, we are missing the Permian, the Triassic, and the Jurassic.
However, it was only relatively recently that Cretaceous age rocks were correctly identified, and the first dinosaur fossils found in the state, so we can never say never, but it seems rather unlikely for other reasons that a large quantity of rocks of these three missing ages will be discovered.
members.socket.net /~joschaper/geo.html   (924 words)

 [No title]
With GEOL 356 Field Geology II, satisfies the field requirement for major in geology.
Instruction and practice in pace-traverse mapping, measurement of stratigraphic sections, and a mapping of areal geology and geologic structure in the Rocky Mountain west.
Supervised internship in some aspect of geology that is of mutual interest to the qualified student and the place the student will work.
www.emich.edu /public/catalogs/undergrad/coa/geo/geol_crs.html   (1053 words)

 Permian period: Historical Geology of the Period
Australia, S Africa, and South America experienced a series of glacial periods, as is shown by the presence of tillite and of conspicuous striations of the underlying rock formations.
This glaciation and the aridity of which the red beds seem to be the result are the two most strongly marked characteristics of the Permian period.
In Europe, the Upper Permian was a period of more extensive marine invasion; the Zechstein formation is predominantly limestone, though it includes rich deposits of copper, salt, gypsum, and potash.
www.factmonster.com /ce6/sci/A0860305.html   (483 words)

 Geology Entrance
Exploring this series of exhibits will take you on a journey through the history of the Earth, with stops at particular points in time to examine the fossil record and stratigraphy.
The Geology Wing is organized according to the geologic time scale.
You might wish to start in the Cenozoic Era (65 million years ago to the present) and work back through time, or start with Hadean time (4.5 to 3.8 billion years ago) and journey forward to the present day.
www.ucmp.berkeley.edu /exhibit/geology.html   (198 words)

 Geology   (Site not responding. Last check: 2007-10-29)
Comte de Buffon (French, 1700s) estimated from iron ball cooling rates that the Earth is 75,000 years old.
James Hutton (English, 1700s) formulated uniformitarian theory, and is known as the father of geology.
Stratigraphy is the study of the Earth’s crust, and biostratigraphy studies it through fossils.
www.stanford.edu /~csewell/culture/geology.htm   (375 words)

 GEOS210 Chapter 16 Cenozoic Geologic History--Tertiary Period   (Site not responding. Last check: 2007-10-29)
Distinguish between the Tertiary and Quaternary Periods and the Paleogene and the Neogene Periods
Summarize the history of eastern NA during this period.
Indicate the implications to the geology of this part of the Appalachians.
www.lhup.edu /jway/210/210Ch16sg.htm   (266 words)

 Glossary Terms Q
These precipitation amount forecast values can then be used as inputs to hydrologic models for river forecasting purposes.
QUATERNARY PERIOD—(Geology) A period consisting of approximately the last 2 million years of earth history, encompassing both the Pleistocene and the Holocene epochs.
The latest geologic period of the Cenozoic era which began about one million years ago, includes the recent and Pleistocene epochs.
outreach.missouri.edu /mowin/Resources2/glossary/glossaryq.html   (310 words)

 Geologic Time - Enchanted Learning Software
Triassic period ends with a minor extinction 213 mya (35% of all animal families die out, including labyrinthodont amphibians, conodonts, and all marine reptiles except ichthyosaurs).
First tetrapods appear toward the end of the period.
Mass extinction (345 mya) wiped out 30% of all animal families) probably due to glaciation or meteorite impact.
www.enchantedlearning.com /subjects/Geologictime.html   (592 words)

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