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Topic: North American craton

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Craton

Interior Plains

Precambrian

Geography of the Interior United States

North America

Muldraugh Hill

Supercontinent

Ordovician

Geography of the Eastern United States

Canadian Shield

List of regions of the United States

Appalachian Mountains

Paleozoic Era

Geography of Missouri

Great Basin

	North America
		North America is a continent in the Earth's northern hemisphere and almost fully in the western hemisphere.
		It is bordered on the north by the Arctic Ocean, on the east by the North Atlantic Ocean, on the southeast by the Caribbean Sea, and on the south and west by the North Pacific Ocean; South America lies to the southeast, connected to North America by the isthmus of Panama.
		The nearest landmass to it is Cape Hatteras, North Carolina, and it is often thought of as part of North America, especially given its historical political and cultural ties to Virginia and other parts of the continent.
	www.wikipediaondvd.com /nav/art/b/v.html (1537 words)

	North Americans - Avoo - Ask Us A Question - (Site not responding. Last check: 2007-11-06)
		Greenland, a Danish self-governing island and the world's largest, is on the same tectonic plate (the North American Plate) but is not considered to be part of the continent.
		The United States Geographical Survey states that the geographic center of North America is “6 miles west of Balta, Pierce County, North Dakota” at approximately 48° 10′North, 100° 10′West, approximately 15 miles (25 km) from Rugby, North Dakota.
		The USGS further states that “No marked or monumented point has been established by any government agency as the geographic center of either the 50 States, the conterminous United States, or the North American continent.” Nonetheless, there is a 15 foot (4.5 m) field stone obelisk in Rugby claiming to mark the center.
	www.avoo.com /wiki/North_Americans (1806 words)

	Wikinfo \| Craton (Site not responding. Last check: 2007-11-06)
		A craton is an old and stable part of the continental crust that has survived the merging and splitting of continents and supercontinents for at least 500 million years.
		Cratons are generally found in the interiors of continents and are formed of a crust of lightweight felsic igneous rock such as granite attached to a section of the upper mantle.
		Cratons are subdivided geographically into geologic provinces, each province being classified as an Archon, a Proton or a Tecton according to its age:
	www.wikinfo.org /wiki.php?title=Craton (286 words)

	Chapter 10: The Cambrian Craton
		Cratons were low in relief and characterized by broad, gentle warping of the crust.
		Paleomagnetic data indicate that North America was near the equator during the Early Paleozoic, suggesting a warm climate that fostered the proliferation of shallow-water marine life (invertebrates such as trilobites, archeosyathids and bryozoans).
		a) flexing of the craton in response to thermal subsidence of rifted continental margins.
	www.uh.edu /~geos6g/1376/cambrian10.html (1530 words)

	North America information - Search.com
		Greenland, a Danish self-governing island and the world's largest, is part of North America geographically and on the same tectonic plate (the North American Plate) but is not considered to be part of the continent politically.
		The United States Geographical Survey states that the geographic center of North America is “6 miles west of Balta, Pierce County, North Dakota” at approximately 48⁰ 10′ North, 100⁰ 10′ West, approximately 15 miles (25 km) from Rugby, North Dakota.
		The remaining nations of North and South America (i.e., including much of the West Indies) where Romance languages prevail, namely Spanish and Portguese, are referred to as Latin America; this usage has entered into common parlance.
	www.search.com /reference/North_America (1225 words)

	H
		Africa was now joined to the north east of the North American Craton, the SUTURE ZONE marked by a vast mountain chain (the Appalachians).
		As the North American Craton was now moving away from Gondwanaland, it was actively "pushing" into the Pacific Plate, greatly increasing subduction and compression in the west.
		North America was cut in two by a seaway reaching from the Gulf of Mexico to the Arctic Ocean.
	courses.unt.edu /hwilliams/GEOL_3020/exam3review.htm (2378 words)

	Geology of the North American Craton
		Folds and thrusts wrap around the southwest corner fo the congo craton into the mouth of the Damara belt from the north, consisant with anticlockwise material flow in the wake of an unstable northward migrating triple junction which is a corollary of sinistral obliquity in the Damara and Basilide belts.
		Therefore western Queen Maude Land and the Kalahari craton were not tied to the rest of East Antarctica-australia until closure of the Mozambique ocean.
		Coakley, B and Gurnis, M., 1995 Far-field tilting of Laurentia during the Ordovician and constraints on the evolution of a slab under an ancient continent: Jour.
	instruct.uwo.ca /earth-sci/300b-001/nacraton.htm (3717 words)

	The Dynamic Earth @ National Museum of Natural History
		Parts of the craton contain rocks that range in age from 2.5 to 4 billion years, including Earth's oldest-known rock.
		Less than 300 million years after North America's craton was assembled, vast tracts of rock were added to its margins as continental crust continued to form.
		Cratonic schist was covered by near-shore sandstone, then deeper-water limestone, as a shallow sea encroached.
	www.mnh.si.edu /earth/text/4_1_3_1.html (573 words)

	Maps of Prophecy
		It was created by the compression of the Asian and American continents as they moved in opposite directions and compressed the space between.
		The vast majority are found in the north, in the Nile delta region.
		The generals in the north were at war.
	www.teachinghearts.org /dre00maps.html (7229 words)

	Cratons and Greenstone Belts (Site not responding. Last check: 2007-11-06)
		As mentioned elsewhere, through the process of differentiation the earth is sorting itself by density: the heavy stuff is sinking towards the core and the lighter stuff is accumulating at the surface, kind of like scum.
		Cratons grow as plate motions move them about the surface of the earth and they run into other crustal plates.
		The North American craton is currently adding material along its western margin, where it is in contact with the Pacific plate along a long, linear zone of faulting called a subduction zone.
	jersey.uoregon.edu /~mstrick/AskGeoMan/geoQuerry12.html (295 words)

	TUL Petroleums Ltd. - Assessment work report 1997, Part I: Lamprophyres of the Peace River District, Part II: Ashes of ... (Site not responding. Last check: 2007-11-06)
		That fact supported the South African claim that the ancient Precambrian North American Craton is sufficiently thick, cool and old to harbour diamond stability fields and that diamond formation and preservation regions in the upper mantle extruded diamond host rocks which breached the crust at one time or another and liberated diamond at surface.
		This regime called the diamond stability field, is generally agreed to be; 1) located under ancient cratons, 2) located near thick slabs of crust referred to as continental roots which have a constant history and temperatures below the temperature at which diamond is destroyed.
		The granitic surface of the ancient Precambrian exhibits topographic positive anomalies on the arch in the EPRA and WPRA, within the north and south boundaries, which are not evident on the Precambrian as a whole.
	www.ags.gov.ab.ca /publications/ABSTRACTS/MIN_19970006.html (1063 words)

	NORTH AMERICAN
		Their formulation was a response to needs recognized during the past century by government surveys (both national and local) and by editors of scientific journals for uniform standards and common procedures in defining and classifying formal rock bodies, their fossils, and the time spans represented by them.
		The Commission, founded as the American Commission on Stratigraphic Nomenclature in 1946 (ACSN, 1947), was renamed the NACSN in 1978 (Weiss, 1979b) to emphasize that delegates from ten organizations in Canada, the United States, and Mexico represent the geological profession throughout North America (Appendix II)
		The term paleosol is currently used in North America for any soil that formed on a landscape of the past; it may be a buried soil, a relict soil, or an exhumed soil (Ruhe, 1965; Valentine and Dalrymple, 1976).
	www.agiweb.org /nacsn/code2.html (13152 words)

	1999 Young Naturalist Awards \| American Museum of Natural History
		Both the Izee and the Olds Ferry terraines, along with nearby Wallowa and Baker terraines, all formed as a sequence of volcanic islands during the Late Triassic, although the Izee terraine is a sedimentary basin created primarily from the erosion of the other three terraines.
		Their accretion to the North American front can be explained through a hypothesized series of events.
		Most of these rocks were then metamorphosed as they accreted to the western front of the North American continent and exposed to the extreme volcanic activity that ensued.
	www.amnh.org /nationalcenter/youngnaturalistawards/1999/anderson.html (1904 words)

	Petrology of Peridotite and Pyroxenite Xenoliths from the Jericho Kimberlite: Implications for the Thermal State of the ...
		The Slave craton comprises dominantly late Archaean (2·7-2·6 Ga) supracrustal and plutonic rocks (Padgham and Fyson, 1992), within which are blocks of older (4·0-2·8 Ga) gneiss and younger sedimentary rocks (Percival, 1996).
		In the Kaapvaal craton, the absence of G10 garnet compositions was interpreted to result from equilibration of harzburgitic assemblages with a lherzolite-dominated mantle (Boyd and Nixon, 1978; Skinner, 1989).
		The mantle underlying the north-central Slave craton comprises, in part, an unusually high proportion of magmatic-textured, non-peridotitic rocks that appear to be related in origin to megacrysts.
	library.iem.ac.ru /j-petr/1-4099/html/egc006_gml.html (10923 words)

	North American Geologic History (Site not responding. Last check: 2007-11-06)
		Craton: continental shield, platform: Interior of the continent
		Interior of N.A. craton flooded by inland sea that rose and fell, depositing the platform rocks, including vast Pennsylvanian swamps that formed coal deposits
		The building of western North America: subduction zone and accretion of displaced terranes
	academic.udayton.edu /HeidiMcGrew/S210NoAmGeoHistNotes.htm (245 words)

	A cratonic Middle Jurassic paleopole: Callovian-Oxfordian stillstand (J-2 cusp), rotation of the Colorado Plateau, and ...
		A cratonic Middle Jurassic paleopole: Callovian-Oxfordian stillstand (J-2 cusp), rotation of the Colorado Plateau, and Jurassic North American apparent polar wander
		The two newly investigated Summerville sites are located east of the Rio Grande Rift, hence representative of the North American craton; their paleopoles are displaced counterclockwise relative to those of the Colorado Plateau, and in amounts consistent with other coeval craton-Colorado Plateau pole pairs.
		Citation: Steiner, M. A cratonic Middle Jurassic paleopole: Callovian-Oxfordian stillstand (J-2 cusp), rotation of the Colorado Plateau, and Jurassic North American apparent polar wander, Tectonics, 22(3), 1020, doi:10.1029/2001TC001284.
	www.agu.org /pubs/crossref/2003/2001TC001284.shtml (580 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		The magnitudes of Phanerozoic crustal deformation in the cratonic interior certainly are very small compared to those known from active continental margins, and the rates of deformation have been generally slower (Schwab, 1976).
		Nevertheless, the Phanerozoic sedimentary record in the central midcontinent region is replete with evidences of tectonic activity of surprising diversity and pattern.
		The Phanerozoic stratigraphic record in the central midcontinent region of North America is divided into six major depositional sequences, each bounded by major interregional unconformities (Sloss, 1963).
	www.igsb.uiowa.edu /pubs/abstract/gsacha10.htm (187 words)

	India, Indian States, India States, Indian hotels, Indian News and Indian Tourism, India Travel
		It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout.
		Panama is generally considered a transcontinental country in Central America (UN region) and South America; population and area figures are for North American portion only, west of the Panama Canal.
		Includes the US state of Hawaii, which is distant from the North American landmass in the Pacific Ocean and is, thus, commonly included with the other territories of Oceania.
	www.bangalorein.com /wiki-North_America (2266 words)

	lab exercises
		Precambrian rocks of the North American craton are exposed in only a few places in Texas.
		This Precambrian granite (1.1 billion years old) is part of the North American craton exposed in the Llano Uplift.
		This is why this part of the state is an "uplift" (the thicker continental crust "floats" higher on the underlying mantle).
	courses.unt.edu /hwilliams/GEOG_3350/lab_exercises.htm (907 words)

	TECTONIC EVOLUTION OF NORTHERN BRITISH COLUMBIA
		This area is composed of ancient cratonic basement, and a collage of terranes which later acreted to this basement.
		Although much more complex, the five morphological belts and the ancient cratonic basement which are located along this transect will be briefly summarized in terms of the terranes of which each belt is composed and tectonic origin and time of acccretion.
		The Stikine Terrane is believed to have evolved in the east Pacific of the Northern Hemisphere and moved northward to dock with ancestral North America sometime during the Middle Jurassic (Macintyre et al., 2001).
	www.emporia.edu /earthsci/student/seigel1/Tectonic_Evolution.htm (1555 words)

	Thermal and compositional anomalies beneath the North American continent
		The thermal and compositional structure of the upper mantle beneath the North American continent is investigated using a joint inversion of seismic velocities and density perturbations.
		The velocity data consist of a new regional shear wave velocity model of North America and the Caribbean region obtained by surface wave tomography.
		Below the North American craton, the mantle is colder than average and depleted in iron.
	www.agu.org /pubs/crossref/2004/2002JB002263.shtml (326 words)

	Grenville Event and Virginia Geology
		Some of the Rice Krispies joined the North American craton, and the North American plate was enlarged by the rocks that formed the first parts of Virginia.
		Instead of being smushed between two continents, Virginia emerged on the coastline of the North American craton.
		When the continents reversed direction and the crust thinned and then cracked, the Grenville-era granitic rocks on the land were covered by a series of volcanic outpourings of basalt.
	www.virginiaplaces.org /geology/rocksdui2.html (1014 words)

	GEOCHEMCIAL IMAGING OF THE WESTERN EDGE OF THE NORTH AMERICAN CRATON IN NORTHERN NEVADA (Site not responding. Last check: 2007-11-06)
		Multielement regional-scale geochemical anomalies in northern Nevada appear to be related to structures along the western edge of the North American craton.
		The craton edge in northern Nevada was established in the late Proterozoic (~ 0.8-0.5 Ga) following polyphase rifting of the Rodinian supercontinent, giving rise to a passive Atlantic-type margin along the present-day western edge of the new subcontinent of Laurentia, which later became the cratonic core of North America.
		Numerous researchers have proposed that these features delineate the edge, or are related to deep-seated crustal structures along the margin of the craton.
	gsa.confex.com /gsa/2001AM/finalprogram/abstract_24755.htm (467 words)

	Texas Minerals
		Approximately one billion years ago, the southern edge of this craton collided with another continent or an oceanic plate in an tectonic event that metamorphosed the sediments into gneisses and schists and partially melted more deeply buried rocks producing granitic magmas.
		The ultramafic rocks and serpentinites that make up the Coal Creek igneous complex are though to represent the remnants of the island arc that collided with the North American craton.
		Fluorite also occurs in pegmatites north of Mason in the Llano Uplift and in the igneous rocks in Chinati Peak in Presidio County.
	www.utexas.edu /tmm/npl/mineralogy/Texas_Minerals/index.htm (1206 words)

	MS Book & Mineral Company Products Page
		Native Americans, Indian Wars, and Native Myths and Legends
		Decade of North American Geology (DNAG) Books produced by the Geological Society of America
		D1: Sedimentary Cover of the Craton in Canada and D2: Sedimentary Cover - North American Craton - U.S. The following volumes are kept the
	booksgeology.com /catalogs.htm (328 words)

	Syllabus
		November 11 The Evolution of the North American Craton III.
		November 16 The Evolution of the North American Craton IV.
		November 23 The Evolution of the North American Craton VI.
	www2.bc.edu /~strother/GE264 (510 words)

	Selected Bibliography of Formations, Williston Basin, North Dakota
		North Dakota Geological Society, 1954, Stratigraphy of the Williston Basin: Bismarck, ND, North Dakota Geological Society, 78 p.
		Forsman, N.F., 1994, Preliminary assessment of zeolite occurrences in North Dakota: Proceedings of the North Dakota Academy of Science, v.
		Hendricks, M.L., 1988, Shallowing-upward cyclic carbonate reservoirs in the lower Ratcliffe Interval (Mississippian), Williams and McKenzie counties, North Dakota, in Goolsby, S.M., and Longman, M.W., eds., Occurrence and petrophysical properties of carbonate reservoirs in the Rocky Mountain region: Denver, CO, Rocky Mountain Association of Geologists, p.371-380.
	www.library.uiuc.edu /gex/bibs/williston.html (16783 words)

	IS THE COLORADO PLATEAU RESPONSIBLE FOR THE ANCESTRAL ROCKIES? (Site not responding. Last check: 2007-11-06)
		Numerous geologic events assembled from the literature and from personal research suggest that the Colorado Plateau may have maintained a quasi-independent identity relative to the rest of the North American craton since sometime in the Proterozoic.
		During the Pennsylvanian-Permian, compression along both the northern border and the eastern border occurred along with paleomagnetic suggestions of a rotation of the Plateau relative to cratonic North America.
		Rotational compression of the Plateau clockwise into the craton also has been suggested to have caused the Laramide deformation of the craton during the Cretaceous.
	gsa.confex.com /gsa/2004RM/finalprogram/abstract_72882.htm (395 words)

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