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Topic: Geologic history

	Geologic time scale - Wikipedia, the free encyclopedia
		The geologic time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the history of the Earth.
		The table of geologic periods presented here is in accordance with the dates and nomenclature proposed by the International Commission on Stratigraphy, and uses the standard color codes of the United States Geologic Survey.
		Because geologic units occurring at the same time but from different parts of the world can often look different and contain different fossils, there are many examples where the same period was historically given different names in different locales.
	en.wikipedia.org /wiki/Geologic_timescale (1761 words)

	Geologic history (from Himalayas) -- Encyclopædia Britannica
		It is, in effect, that segment of Earth history that is represented by and recorded in rock strata.
		History is a science—a branch of knowledge that uses specific methods and tools to achieve its goals.
		Brief history of Uruguay from its settlement by Europeans in the 16th century to the restoration of democracy in the 1980s.
	www.britannica.com /eb/article-47869?tocId=47869 (891 words)

	Geology of Crater Lake National Park (Site not responding. Last check: 2007-10-12)
		Geological history shows that catastrophic events of this kind can repeat.
		One of the approaches U.S. Geological Survey scientists are using to answer this important question is to unravel the geologic history of the Crater Lake caldera floor."
		The foremost threat from young calderas is that of renewed volcanic activity.
	www.nps.gov /crla/brochures/geology.htm (960 words)

	Appalachian Geologic History (Site not responding. Last check: 2007-10-12)
		The rocks and geologic structures of eastern West Virginia record a series of geological events spanning perhaps 470 million years of geologic time.
		The margins of closing ocean basins are the site of much geologic activity: earthquakes, volcanism, and ultimately the collision of chunks of continental crust which produces intensely folded and faulted mountain ranges along the zone of contact.
		Limestone deposition continued through the end of the Silurian period and into early Devonian times, but toward the middle Devonian, geologic change was again on the horizon and eastern West Virginia and northward into Pennsylvania became an extensive beach region onto which was deposited the sand that would become the Oriskany sandstone.
	euclid.dne.wvfibernet.net /~jvg/Env105/geologic_history.html (1753 words)

	Historical Wyoming Tidbits - Geology
		The schists and gneisses now in the highest peaks of Wyoming's mountain ranges are the tattered relics of the Precambrian, the first and longest chapter of Wyoming's history, extending 90% of the way along earth's time line.
		Their remnants have been "folded, metamorphosed, and intruded upon by other rock types,” and show up in the basement level rocks that are exposed, in a classic twist of story line, on Wyoming’s mountain peaks.
		The next two chapters in our history were long, wet, and dreary -- 375 million years as an ocean floor during the Paleozoic and 160 million years of transition in the Mesozoic when the environment fluctuated between wet and dry.
	www.wyomingbnb-ranchrec.com /History.Geologic.html (1174 words)

	Human/Geologic History
		An entire book could be written on how the geology of the Mid-Atlantic has influenced the people living here, and occasionally in the geologic history we will run a tangent to mention examples, but let us look at the influence of topography on European migratory patterns in Colonial times.
		Nonetheless, in Virginia, most of the eastern seaboard (coastal plain province) was settled by the British and they established farms and plantations in the good soils on the flat topography of the coastal plain.
		Oh, of course, they do not have the geological technical knowledge we have, which really did not begin to develop until the 19th century, but they were closer to and more directly dependent on the lay of the land, and its resources, than the average citizen is today.
	csmres.jmu.edu /geollab/vageol/vahist/history.html (1358 words)

	Geologic History
		Frenchman Mountain wasn't "created" in its present form: every detail of its structure and appearance is a result of historical happenstance.
		Three geologic processes have combined to shape the Frenchman Mountain area--tectonics, erosion, and deposition.
		These processes are gradual, but not constant; the relative importance of each depends on the surrounding circumstances during any given time interval.
	members.aol.com /llanitedav/rainbowgardens/GeoHistory.html (791 words)

	NPS: Nature & Science» Geology Resources Division
		What is unique about the geologic record at Grand Canyon is the great variety of rocks present, the clarity with which they're exposed, and the complex geologic story they tell.
		Geologically it is significant because of the thick sequence of ancient rocks that are beautifully preserved and exposed in the walls of the canyon.
		Basic geological principles, including plate tectonics, structural features and their significance, and the role of erosion, are introduced and emphasized throughout; a glossary and a full index enhance the book's usefulness.
	www2.nature.nps.gov /geology/parks/grca (2994 words)

	Geologic History of Utah - Utah Geological Survey
		Due to plate tectonics the state has move from a position on the equator to its present location and in doing so has rotated nearly 90 degrees from an east-west orientation to its present north-south position.
		We don't know as much about the first 3 billion years as we know about the 540 million years that followed, but rocks of this vast age range are exposed in the Raft River Range, Uinta Mountains, and parts of the Wasatch Range, as well as several other smaller areas of the state.
		These rocks give clues to the formation of the continent (including Utah), metamorphism and igneous intrusion, erosion of several miles of sediment, and a variety of environments, including oceans, tidal flats, rivers, streams, lakes, and continental glaciers.
	geology.utah.gov /utahgeo/geo/geohistory.htm (351 words)

	Northwest Origins (Site not responding. Last check: 2007-10-12)
		The geologic evolution of Washington State is one of the most fascinating geologic stories ever told.
		The creation and destruction of giant continents played a major role in the early geologic history of Washington and the Pacific Northwest.
		The Challis Episode, named after a small town in Idaho, is the most controversial chapter in Pacific Northwest geologic history.
	www.washington.edu /burkemuseum/geo_history_wa (1109 words)

	Geologic History
		This relative time scale is based on the study of rock layers (stratigraphy) and the study of fossils (paleontology) and is still in use today.
		The strange sounding names: Ordovician, Cretaceous, Quaternary, etc., are still used by geologists and refer not just to rocks and fossils but to periods of geologic history.
		Geologists quickly learned to read these clocks and put absolute ages on the periods of the Geologic Time Scale.
	www.watersheds.org /earth/history.htm (289 words)

	300 Geologic History (Site not responding. Last check: 2007-10-12)
		To learn the definitions of and proper spelling for scientific terms that are used commonly in newspapers, magazines, and books, and on television and radio programs in discussions about fossils and geologic history.
		The worldwide rock record shows geologists and paleontologists that at various times in the geologic past large numbers of families and even orders of animal and plant groups have become extinct almost simultaneously.
		It is important to comprehend that, even though geological movements are not fast enough to recognize in a lifetime, there is sufficient geologic time available for seemingly improbable events to become probable.
	www.csun.edu /geology/Class_Notes/ES300/300history.html (1137 words)

	Geologic History of the Long Valley Caldera
		Persistent earthquake and volcanic activity over the past 4 million years has formed the spectacular eastern Sierra landscape in the vicinity of Long Valley caldera and the Mono Basin.
		Evidence from both seismic soundings of the crust and studies of the fabric and composition of the lava indicate that these eruptions probably originated from small, discrete magma bodies rather than from a single, large magma chamber of the sort that produced the caldera-forming eruption 760,000 years ago.
		This geologically recent volcanic activity, together with unrest in Long Valley Caldera that began in 1980 and the frequently felt earthquakes in the region, are reminders the processes that have sculpted the eastern Sierra landscape over the past 4 million years continue today.
	lvo.wr.usgs.gov /History.html (635 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.
		Last but not least, don't forget to visit our exhibit on Plate tectonics, an important geological concept in any time period!
	www.ucmp.berkeley.edu /exhibit/geology.html (198 words)

	Geologic History
		About 50 million years ago, at the start of the Eocene Epoch of the Cenozoic Era of Earth’s history, western San Diego County was still attached to coastal Mexico, and was partly inundated by the ocean.
		Because it frequently has round cannon-ball-size concretions (deposits of harder minerals around sand grains or fossils) in it, and these make rounded holes when they fall out, many people believe they are the origin of the caves.
		Sea level rose and fell often during this period in geologic history, and more mud was deposited again, similar to but younger than the Del Mar Formation.
	www.batiquitosfoundation.org /geology.htm (2184 words)

	Geologic History of Western US (Site not responding. Last check: 2007-10-12)
		This presentation shows graphically the Proterozoic and Phanerozoic geologic history of the Southwestern US.
		The presentation begins with a text file that provides a brief narrative of the geologic history.
		Alternately, you can navigate through geologic time from graphic to graphic without returning to the text each time.
	jan.ucc.nau.edu /~rcb7/Geologic_History_WUS.html (240 words)

	WVGES Geology: Historical Geology Summary
		Prior to one billion years ago, the geologic history of West Virginia is obscure.
		However, in this formation they are abundant and of forms that had already developed through a substantial part of all evolution that has taken place during the history of the earth.
		Permission to reproduce this material is granted if acknowledgment is given to the West Virginia Geological and Economic Survey.
	www.wvgs.wvnet.edu /www/geology/geolhist.htm (849 words)

	DRAM, FGS, Florida Geologic History
		Florida's geologic history begins deep beneath its surface where ancient rocks indicate that Florida was once a part of northwest Africa.
		Very little siliciclastic sediment (quartz sands, silts, and clays) was able to reach Florida because the "Gulf Trough" separated the Florida Platform from the siliciclastic source area of the Appalachian Mountains.
		Lane,E. (editor), 1994, Florida's Geological History and Geological Resources, FGS Special Publication 35, 76 p.
	www.dep.state.fl.us /geology/geologictopics/geohist.htm (425 words)

	Geologic History of Crater Lake.
		Erosion removed much of this material, feeding rivers that carried it far from its source, ultimately into the Pacific Ocean.
		Prior to the climactic event, Mount Mazama had a 400,000 year history of activity similar to other Cascade volcanic centers such as Mount Shasta.
		The caldera wall displays the geologic layering of lava flows through time.
	craterlake.wr.usgs.gov /geology.html (921 words)

	Florida Geology - Plant Management in Florida Waters
		Each year, the unique topography attracts attention from all over the world as millions of people travel to Florida for a chance to enjoy the state's vast collection of natural karst wonders.
		Appreciation for the sculpted terrain of contemporary Florida begins with an understanding of the geologic processes that began over 40 million years ago when the region was at the bottom of the ocean.
		The solution percolates down through the limestone bedrock through pores or cracks in the solid rock and moves through the aquifer as groundwater.
	aquat1.ifas.ufl.edu /guide/geology.html (617 words)

	Geologic History
		LaPorte refers it to as the Helderberg sea, after the Helderberg Group of geologic formations that were deposited on its floor (1969: 115).
		This shallow sea migrated northward and westward as large amounts of sediment eroded into it from the newly formed Appalachians and Catskills to the east.
		Faill, Rodger T. “A geologic history of the north-central Appalachians; Part 2, the Appalachian Basin from the Silurian through the Carboniferous.” American Journal of Science.
	www.sas.upenn.edu /earth/geol205/geol_hist.html (1759 words)

	Geological Evolution of Virginia and the Mid-Atlantic Region
		Geological Evolution of Virginia and the Mid-Atlantic Region
		The material is copyrighted, but may be used by anyone for personal or education purposes as long as the source is acknowledged.
		- each history has its own introductory page that describes how it is organized, the best way to print copies, and links into the actual history.
	csmres.jmu.edu /geollab/vageol/vahist (137 words)

	Geology
		The Connecticut Valley has as much as 30,000 feet of sediment preserved, but in the Franklin and Hampshire County area of the valley, the thickness is about 6,000 feet.
		Keep this in mind as were look at events of the Cenozoic, our last (and continuing) Era of geologic time.
		Finally, by the end of the Mesozoic Era, 65 million years ago, the region had eroded to a flat plain called a peneplain.
	www.bio.umass.edu /biology/conn.river/crvgeology.html (1768 words)

	Geologic History of Arizona (Site not responding. Last check: 2007-10-12)
		This page was designed to provide an overview of the geologic evolution of the state of Arizona.
		It is supplemented with photos, graphic reconstruction's and text which will bring to life nearly 2.0 billion years of Earth history recorded in the rocks and structures throughout Arizona.
		Each link will present information about Arizona including the paleogeography of that time interval along with supporting photographs and illustrations.
	web1.shastacollege.edu /geoscience/histories/Az/GeoHist_Az.html (79 words)

	Title Page, Geologic History of Cape Cod Massachusetts, by Robert Oldale
		Cape Cod is a sandy peninsula built mostly during the ice age and juts into the Atlantic Ocean like a crooked arm (see Fig.
		Geologists are interested in Cape Cod because it was formed, by glaciers, very recently in terms of geologic time and because of the ever changing shore as the Cape adjusts to the rising sea.
		This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code.
	pubs.usgs.gov /gip/capecod (151 words)

	Kauai's Geologic History (Site not responding. Last check: 2007-10-12)
		That is followed (pages 29-33) by key illustrations, never before presented in a simplified book form, that summarize new data on the geology of the submarine portions of the Hawaiian volcanic mountain/ islands.
		Table of geologic ages of islands and seamounts of the
		Schematic diagram of the geologic sages of Kauai.
	www.teok.com /Books.html (357 words)

	Geologic History (Site not responding. Last check: 2007-10-12)
		By mapping the age and distribution of the features seen on Mars, it is possible to derive a general history.
		The earliest history on Mars, termed the Noachian Period, is recorded in the heavily cratered terrain and ancient impact basins, such as Hellas.
		We are just beginning to understand the complexity of the history of Mars.
	helio.estec.esa.nl /intermarsnet/redreport/node20.html (403 words)

	Geologic History of the Moon (Site not responding. Last check: 2007-10-12)
		Since 1987 The Geologic History of the Moon (D.
		Wilhelms) has remained the cornerstone reference for all lunar geologists, and was originally published as United States Geological Survey Professional Paper 1348.
		Scanning, processing, and editing by Sandy Yoon, Carmen Salas, Julie Beck, and Mark Robinson of the Northwestern University Center for Planetary Sciences and Department of Geological Sciences.
	cps.earth.northwestern.edu /GHM (367 words)

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