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Topic: Taconic orogeny

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Orogeny

Iapetus Ocean

Geology

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Dike (construction)

	Geol Evol Virginia-Cross Section H
		The HFRV fault is not new; it was active in the Grenville (Stage A), and is reactivated by the Taconic collision.
		But in the Taconic even this is not simple because we have two major sourcelands, one in the north and one in the south (not to mention the terrane blocking the opening of the reentrant), and several foreland basins.
		The end of the Taconic orogeny is marked by the Clinch/Tuscsarora formation (and its equivalents like the Massanutten sandstone), an extremely pure quartz sandstone that blankets the entire Appalachian region from New York to Tennessee.
	csmres.jmu.edu /geollab/vageol/vahist/H-MidO.html (2256 words)

	Orogeny - Wikipedia, the free encyclopedia
		Orogeny (Greek for "mountain generating") is the process of mountain building, and may be studied as a tectonic structural event, as a geographical event and a chronological event, in that orogenic events cause distinctive structural phenomena and related tectonic activity, affect certain regions of rocks and crust and happen within a time frame.
		Orogenic events occur solely as a result of the processes of plate tectonics; the problems which were investigated and resolved by the study of orogenesis contributed greatly to the theory of plate tectonics, coupled with study of flora and fauna, geography and mid ocean ridges in the 1950s and 1960s.
		It was, in the context of orogeny, contested hotly by proponents of vertical movements in the crust (similar to tephrotectonics), or convection within the asthenosphere or mantle (geology).
	en.wikipedia.org /wiki/Orogeny (1498 words)

	Taconic orogeny - Wikipedia, the free encyclopedia
		The Taconic orogeny was a great mountain building period that perhaps had the greatest overall effect on the geologic structure of basement rocks within the New York Bight region.
		When the Taconic Orogeny subsided in the New York Bight region during Late Ordovician time (about 440 million years ago), subduction ended, culminating in the accretion of the Iapetus Terrane onto the eastern margin of the continent.
		As the Taconic Orogeny subsided in early Silurian time, uplifts and folds in the Hudson Valley region were beveled by erosion.
	en.wikipedia.org /wiki/Taconic_orogeny (668 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: 2007-10-17)
		Orogeny (Greek for "mountain generating") is the process of mountain building, and may be studied as a tectonic structural event, as a geographical event and a chronological event, in that orogenic events cause distinctive structural phenomena and related tectonic activity, affect certain regions of rocks and crust and happen within a time frame.
		Orogenic events occur solely as a result of the processes of plate tectonics; the problems which were investigated and resolved by the study of orogenesis contributed greatly to the theory of plate tectonics, coupled with study of flora and fauna, geography and mid ocean ridges in the 1950s and 1960s.
		It was, in the context of orogeny, contested hotly by proponents of vertical movements in the crust (similar to tephrotectonics), or convection within the asthenosphere or mantle (geology).
	sjedit.us.publicus.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=orogeny (1550 words)

	Orogeny Summary
		Orogeny and orogenesis are derived from the Greek words oros, meaning mountain, and geneia, meaning born.
		Orogeny can also have a time connotation when used in naming periods of intense tectonic activity and mountain building, whilst orogenesis is only used to describe the process.
		In terms of recognising orogeny as an event, Leopold von Buch (1855) recognised that orogenies could be placed in time by bracketing between the youngest deformed rock and the oldest undeformed rock, a principle which is still in use today, though commonly investigated by geochronology using radiometric dating.
	www.bookrags.com /Orogeny (1998 words)

	Orogeny
		Orogeny is a geologic term associated with periods of mountain building.
		Sea bottom and near shore material may be overthrust into the orogeny covering some or all of the active area.
		Someplace under the orogenic belt will be a subduction zone that promoted the collision by consuming crust and dragging the material on one side of the collision into contact with that on the other.
	www.wikimoz.org /wiki/en/wikipedia/o/or/orogeny.html (383 words)

	Taconic orogeny at AllExperts
		The Taconic orogeny was a great mountain building period that perhaps had the greatest overall effect on the geologic structure of basement rocks within the New York Bight region.
		When the Taconic Orogeny subsided in the New York Bight region during Late Ordovician time (about 440 million years ago), subduction ended, culminating in the accretion of the Iapetus Terrane onto the eastern margin of the continent.
		As the Taconic Orogeny subsided in early Silurian time, uplifts and folds in the Hudson Valley region were beveled by erosion.
	en.allexperts.com /e/t/ta/taconic_orogeny.htm (779 words)

	Taconic orogeny
		Taconic orogeny - a mountain-building event that affected the Appalachian Geosyncline along the eastern coast of the United States.
		During the Taconic Orogeny, one of the mountain building events of the Appalachians, blocks of continental shelf were broken off into the ocean.
		Orogeny (Greek for "mountain generating") is the process of mountain building, and may be...
	www.logicjungle.com /wiki/Taconic_orogeny (203 words)

	[No title]
		The orogeny marking this collision is called the Appalachian in North America (Allegheny, according to your author, a distinct minority view), and the Hercynian in Europe.
		Taconic Orogeny —In the Late Ordovician-Early Silurian, graywacke and interbedded volcanics indicate closure in the Taconic orogeny.
		Antler Orogeny - This began in the Devonian, with the subduction of oceanic lithosphere beneath the western margin of the craton, crushing sediment in the intervening basin.
	www.lee.edu /~cguldenzopf/Historical/Chapters/Historicalch20.doc (7300 words)

	Toronto Catalog (Site not responding. Last check: 2007-10-17)
		The effects of this orogeny are most apparent throughout New England, but the sediments derived from mountainous areas formed in the northeast can be traced throughout the Appalachian and Midcontinent regions of North America.
		The Acadian orogeny is the name of a long-lasting mountain building disturbance that most greatly affected the Northern Appalachian region (New England northeastward into the Gaspé region of Canada).
		The "climax" of this orogeny is dated as early in the Late Devonian, but deformation, plutonism, and metamorphism related to this orogeny continued well into the Mississippian Period.
	www.torontopost.biz /Info/?Iapetus_Ocean (819 words)

	The Orogeny Zones and Virginia Geology
		The scrunching together of the island arc with the continental margin formed mountains as high as the Himalayas, in a mountain-building event known as the Taconic orogeny.
		The layer concluding the Taconic orogeny is known today (depending upon your location) as the Tuscarora, Clinch, or Massanutten sandstone.
		Those limestones and shales and sandstones from the Taconic and Acadian erosion cycles were folded, crumpled, and (close to the shoreline) broken.
	www.virginiaplaces.org /geology/rocksdui3.html (1715 words)

	Taconic and Acadian Orogenies
		Orogenies are driven by collision of land masses.
		Prior to the Taconic orogeny, the "east" coast of what is now the United States was located near the Hudson River valley, Philadelphia, Washington, DC and extended to western South Carolina.
		The Taconic mountain chain was created as the arc rode up and onto the Laurentian land mass, a part of which was subducted (drawn under) the Taconic arc.
	www.jamestown-ri.info /acadian.htm (1065 words)

	The Early Paleozoic (Site not responding. Last check: 2007-10-17)
		The Taconic Orogeny is the first of several great mountain building episodes that occur throughout the rest of the Paleozoic.
		The Taconic Orogeny marks the beginning of the ocean closure phase of a Wilson Cycle.
		Know the sequence of orogenies that occured during the Early and Late Paleozoic This is from Chapters 8 and 9.
	ccollege.hccs.cc.tx.us /instru/physci/geo/cate/historical/HistCh8.htm (1748 words)

	Taconic Orogeny
		The Taconic Orogeny of the Middle Hudson Valley
		The story of these pillow basalts may not be so simple: some have made the interpretation of a shallow water pillow basalt formed during the time of the Ordovician Taconic Orogeny which was then thrust into this position from the east.
		This thrusting is a result of the Taconic Orogeny during the Ordovician period.
	www.priweb.org /ed/earthtrips/cent_NY/taconic.html (417 words)

	HOW DO OROGENIES END? AN EXAMPLE FROM THE TACONIC OROGENY IN THE NORTHERN APPALACHIANS (Site not responding. Last check: 2007-10-17)
		The Taconic orogeny is commonly attributed to collision of Laurentia with an arc that formed above an east-dipping subduction zone.
		The end of the Taconic orogeny must be related to a reconfiguration of plate boundaries that transferred convergence from the orogen to a new subduction zone.
		Because the Bronson Hill arc began to form at approximately the same time that the Taconic orogeny ended, it is likely that initiation of the new west-dipping subduction zone was instrumental in bringing the orogeny to a close.
	gsa.confex.com /gsa/2001AM/finalprogram/abstract_27419.htm (478 words)

	Department of Geology, University at Buffalo
		Through this orogeny, a mountain chain stretching from western Newfoundland in the North and as far South as Alabama, formed along the eastern coast of ancient North America, or Laurentia, as it is called.
		Following the Ordovician Taconic orogeny and its amalgamation of exotic terranes and island arc complexes deriving from far east in the Iapetus Ocean and glued onto the eastern margin of Laurentia, another orogenic event shaped the east coast of the continent.
		In the Acadian orogeny, Laurentia collided with the smaller continent of Avalonia.
	www.geology.buffalo.edu /contrib/people/faculty/gly216trip.htm (1656 words)

	Freeman-Lynde GLY116 Paleozoic Tectonics Questions
		The Piedmont collided with Laurentia to cause the Taconic Orogeny.
		The clastic wedge associated with the Alleghenian Orogeny is the ________________.
		The clastic wedge associated with the Devonian Acadian Orogeny of Laurentia is the ___________.
	www.arches.uga.edu /~rfreeman/Paleozoic_tectonics_questions.html (2727 words)

	Paleozoic Era
		During the late Ordovician, material from the volcanic arc and from the floor of the Iapetus Ocean was thrust upon the North American plate.
		The Taconic mountains continued to be a source of sediment throughout the first half of the Silurian.
		This orogeny was much larger than either the Taconic or Acadian orogenies, and it represented one of the last collisions in the formation of Pangaea.
	jamesandbrenda.faithweb.com /paleozoic.htm (1267 words)

	Taconic Mountains - Wikipedia, the free encyclopedia
		The Taconic Mountains are part of the Appalachian Mountains, running along the eastern border of New York State, United States.
		The Taconic mountain range was formed from the collision of the North American Plate into a volcanic island arc, similar to modern-day Japan, during the late Ordovician Period, around 440 million years ago.
		A more complete discussion is at Taconic orogeny.
	en.wikipedia.org /wiki/Taconic_Mountains (147 words)

	Orogeny - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-17)
		In geology, orogeny is the process of mountain building.
		Orogeny can occur due to continential collisons or volcanic activity.
		Maps of the Acadian and Taconic orogenies (http://greenfield.fortunecity.com/shell/89/)
	www.gogog.com /project/wikipedia/index.php?title=Orogeny&printable=yes (431 words)

	GO 568 Appalachian Mountains
		All three orogenies are interpreted in terms of collisions during closing of the Iapetus Ocean between North America, Europe and Africa (Gondwana).
		The Acadian Orogeny took place between North America and Europe, and is contemporaneous with Caledonian Orogeny of the British Isles, Greenland, and Scandinavia.
		Finally the Allegheny Orogeny involved the collision between Africa (a portion of Gondwana) and the North American-European continent.
	academic.emporia.edu /aberjame/struc_geo/appalach/appalach.htm (1633 words)

	Acadian orogeny - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-17)
		The Acadian orogeny is a middle Paleozoic deformation, especially in the northern Appalachians, between Alabama and Newfoundland.
		In Gaspé and adjacent areas, its climax is dated as early in the Late Devonian, but deformational, plutonic, and metamorphic events extended into Early Mississippian time.
		It appears to have been contemporaneous with the Bretonic phase of the of Europe, with metamorphic events in southwestern Texas and northern Mexico, and with the Antler orogeny of the Great Basin.
	www.gogog.com /project/wikipedia/index.php/Acadian_orogeny (181 words)

	* Orogeny - (GIS): Definition
		The Coast Ranges are the most recent products of still active orogeny that results from the collision of the Pacific and North American lithospheric plates.
		The Nahanni Range of Canada's Northwest Territories, formed 60 million years ago in the Laramide Orogeny, still shows the effects of that long-past upheaval in extensive thrust faulting and folding.
		This applies to the solid surface (orogeny; few mountains are higher than 10 km, few deep sea trenches deeper than that) as it does to the liquid surface (dynamic sea surface topography) and the earth's atmosphere.
	en.mimi.hu /gis/orogeny.html (234 words)

	The Geology of Ohio--The Ordovician
		This event, the Taconic Orogeny, which culminated in the Late Ordovician, is recorded in rocks stretching from Newfoundland to Alabama.
		As the Taconic Orogeny reached its zenith in the Late Ordovician, sediments eroded from the rising mountains were carried westward, forming a complex delta system that discharged mud into the shallow seas that covered Ohio and adjacent areas.
		This deepening of the sea is interpreted to be the result of increased tectonic activity to the east associated with the Taconic Orogeny.
	www.dnr.state.oh.us /geosurvey/oh_geol/97_Fall/ordovici.htm (3721 words)

	The Acadian Orogeny
		The Caledonian orogeny was caused by the collision between Baltica and Greenland, which was attached to Canada at the time.
		The Acadian orogeny and the Caledonian orogeny mark the assemblage of the super-continent Laurussia.
		The erosion of the Acadian orogeny produced the Catskill Clastic Wedge, while similar deltaic sediments or molasse are called the Old Red Sandstone in Europe.
	www.student.brynmawr.edu /students/mlindhol/overview.html (322 words)

	NYC Regional Geology
		The Taconic Mountains consist of complexly folded and faulted Early Paleozoic rocks which, in part, have not been subjected to the high degree of metamorphism as rocks to the south and east.
		This is particulary evident in the Taconic Mountains, throughout the Hudson Valley, and in portions of the New Jersey Highlands.
		To the north and east, the boundary between the Hudson Highlands, the Taconic Mountains, and the Western Connecticut Uplands region is indistinct, partly because of the occurrence of numerous thrust faults and large igneous Middle Paleozoic intrusions in the region.
	3dparks.wr.usgs.gov /nyc/highlands/highlands.html (3481 words)

	Berkshire Taconic :: Geography :: Cambrian and Ordivician Periods 570,000,000 - 438,000,000 y.b.p.
		During the Taconic Orogeny most of the North American continent was south of the equator.
		The Taconic Orogeny lasted 35 million years, from the mid-Ordovician to the early Silurian.
		At the peak of the orogeny the Taconic Mountains were 20,000 feet high.
	www.lastgreatplaces.org /berkshire/geography/art6367.html (549 words)

	Taconic Orogeny: Britannica Concise Encyclopedia
		Mountain-building event that affected the Appalachian Geosyncline along the eastern coast of the U.S. Evidence for the orogeny is most pronounced in the northern Appalachian Mountains, but its effects can be noted as far away as Tennessee and Georgia.
		Events ascribed to it include the development of New York's Taconic Range and Vermont's Green Mountains.
		Originally thought to have occurred at approximately the Ordovician-Silurian boundary (443 million years ago), it is now generally considered to have consisted of several pulses from the mid-Ordovician to the early Silurian Period.
	ref.enotes.com /britannica-encyclopedia/taconic-orogeny (118 words)

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