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	AllRefer.com - Precambrian era (Geology And Oceanography) - Encyclopedia
		Precambrian era, name of a major division of geologic time (see Geologic Timescale, table), from c.5 billion to 570 million years ago.
		Precambrian rocks often occur in shields, which are large areas of relatively low elevation that form parts of continental masses.
		The rocks of this region, and of the Early Precambrian as a whole, are generally granite, schist, or gneiss.
	reference.allrefer.com /encyclopedia/P/Precambr.html (633 words)

	Precambrian - Wikipedia, the free encyclopedia
		The Precambrian (or Pre-Cambrian) is an informal name for the eons of the geologic timescale that came before the current Phanerozoic eon.
		Remarkably little is known about the Precambrian, despite it making up roughly seven-eighths of the Earth's history, and what little is known has largely been discovered in the past four or five decades.
		It is thought that the Earth itself coalesced from material in orbit around the sun roughly 4500 Ma and may have been struck by a very large (Mars-sized) planetesimal shortly after it formed, splitting off material that came together to form the Moon (see Giant impact theory).
	en.wikipedia.org /wiki/Precambrian (1170 words)

	HighBeam Encyclopedia - Precambrian era (Site not responding. Last check: 2007-10-24)
		PRECAMBRIAN ERA [Precambrian era] name of a major division of geologic time (see Geologic Timescale, table), from c.5 billion to 570 million years ago.
		Precambrian rocks are mostly covered by rock systems of more recent origin, but where visible they commonly display evidence of having been altered by intense metamorphism.
		Precambrian rocks often occur in shields, which are large areas of relatively low elevation that form parts of continental masses.
	www.encyclopedia.com /html/P/Precambr.asp (714 words)

	Precambrian: Precambrian Era
		The end of the Precambrian era was a time of great volcanic activity, renewed mountain building and igneous intrusions.
		Precambrian is an era which includes the Proterozoic eon and the Archean eon spanning about 2000 years each.
		The Precambrian Era spans over three billion years whereas the time since the end of the Precambrian has only been 500 million or a half billion years.
	www.lycos.com /info/precambrian--precambrian-era.html (462 words)

	Precambrian era. The Columbia Encyclopedia, Sixth Edition. 2001-05
		Precambrian rocks are mostly covered by rock systems of more recent origin, but where visible they commonly display evidence of having been altered by intense metamorphism.
		One of the largest exposed areas of Early Precambrian rocks is the Canadian Shield, where geologist Sir William Logan did his pioneer work.
		The life of the Late Precambrian is poorly represented by fossils, but a few invertebrates including creatures resembling jellyfish and worms have been discovered.
	www.bartleby.com /65/pr/Precambr.html (564 words)

	Palaeos Timescale: The Precambrian
		The Precambrian is that stretch of geological time from the formation of the Earth itself to the start of the Cambrian period.
		These three eras, the Hadean, Archean and Proterozoic have recently been promoted to the status of eons, although both the Geological Society of America and the International Commission on Stratigraphy have chosen to ignore the Hadean.
		It was only at the very end of the Precambrian that there was a sort of "quantum leap" in evolution from simple microbes to complex multicellular organisms.
	www.palaeos.com /Timescale/Precambrian.htm (791 words)

	CVO Website - Precambrian (Site not responding. Last check: 2007-10-24)
		The earliest subdivision of the Precambrian, spanning the time between the formation of the Earth, about 4.5 billion years ago, and the start of the Archaean era, 3.8 billion years ago.
		The middle era of Precambrian time, spanning the period between 3.8 and 2.5 billion years ago.
		The final era of the Precambrian, spanning the time between 2.5 billion and 544 million years ago.
	vulcan.wr.usgs.gov /LivingWith/VolcanicPast/Notes/precambrian.html (189 words)

	Precambrian Era (Site not responding. Last check: 2007-10-24)
		The Precambrian was originally defined as the era that predated the emergence of life in the Cambrian Period.
		This era began with the formation of the earth from dust and gas orbiting the Sun about 4.6 billion years ago.
		However, the Precambrian oceans did not settle in the basins we know, but covered much of the continents with shallow seas in which the story of a billion years of earth history was to be recorded.
	www.geo.msu.edu /geo333/Precambrian.html (2441 words)

	Earth Floor: Geologic Time
		This era begins about 4.6 billion years ago with the formation of Earth from dust and gas orbiting the Sun.
		Even though the movements of Earth's surface we call Plate Tectonics are still very fast and continental collisions are frequent (every few hundred million years or so!), the centers or cores of the continents are now quite large and stable.
		In fact, geologists date the beginning of the Proterozoic Era by the age of the oldest continental rocks that have not been reheated or chemically altered.
	www.cotf.edu /ete/modules/msese/earthsysflr/cambrian.html (1058 words)

	The Precambrian (Site not responding. Last check: 2007-10-24)
		To speak of "the Precambrian" as a single unified time period is misleading, for it makes up roughly seven-eighths of the Earth's history.
		Consider that the Earth formed, life arose, the first tectonic plates arose and began to move, eukaryotic cells evolved, the atmosphere became enriched in oxygen -- and just before the end of the Precambrian, complex multicellular organisms, including the first animals, evolved.
		Prekambrium is an exhibit on the Precambrian at the Paleontology Museum in Oslo (text is in Norwegian).
	www.ucmp.berkeley.edu /precambrian/precambrian.html (255 words)

	Portable Planetariums Home More than a Portable Planetarium (Site not responding. Last check: 2007-10-24)
		Classically, the boundary between the Proterozoic and the Paleozoic was set at the base of the Cambrian period when the first fossils of animals known as trilobites and archeocyathids appeared.
		In the second half of the 20th century, a number of fossil forms have been found in Precambrian rocks, but the boundary of the Proterozoic has remained fixed at the base of the Cambrian - currently thought to be around 545 Million years before the present.
		The major events of this era are the formation of the Rodinia supercontinent and the evolution of sexual reproduction.
	www.planetarios.com /manualarqueo.htm (2725 words)

	Precambrian Era (Site not responding. Last check: 2007-10-24)
		The Precambrian Era was originally designated as all the rocks below or older than the Cambrian.
		More recently the era has been subdivided into three time periods based on radioactive dating and the discovery of numerous fossil locations.
		The Precambrian Era spans over three billion years,whereas the time since the end of the Precambrian has onlybeen 500 million, or a half billion, years.
	www.watersheds.org /earth/gtime01.htm (144 words)

	Black Canyon of the Gunnison National Park - 1: The Precambrian Era (U.S. National Park Service)
		The Precambrian Era accounts for the history of the Earth from its very beginning up until about 540 million years ago.
		Because most of Colorado's Precambrain-age rocks have been highly altered by extreme heat and pressures, it is difficult for geologists to interpret what this region may have looked like during this time.
		Precambrian rocks are often called basement rocks since they are usually buried deep beneath the surface.
	www.nps.gov /blca/naturescience/precambrian.htm (504 words)

	The International Museum of Texas
		The formation of Gondwanaland during the Late Precambrian (uniting the modern continents of the Southern Hemisphere) provided warm, shallow, off-shore environments where complex living organisms first appeared.
		The most ancient direct evidence of life on earth was found in Western Australia, where outcroppings of dense, sedimentary chert contain the oldest undoubted microfossils known.
		A primitive echinoderm, the earliest known, a filter-feeding organism ancestral to starfish and, possibly, the chordates.
	www.kingtutexhibit.com /precambrian.htm (416 words)

	From Sea to Prairie--4--Geologic Time (Site not responding. Last check: 2007-10-24)
		During the Paleozoic Era, which followed the Precambrian and lasted 245 million years, plants and reptiles began moving from the sea to the land.
		Rocks from the last three periods in the era, called the Mississippian, the Pennsylvanian, and the Permian periods, can be found at the surface in central and eastern Kansas.
		Later in the era, in the Cretaceous Period, much of the state was covered by seas.
	www.kgs.ku.edu /Publications/primer/primer04.html (651 words)

	Precambrian Era (Site not responding. Last check: 2007-10-24)
		The Precambrian Era is Earth's first era of time.
		The Precambrian Era is divided into three periods: the Azoic, Archeozoic and the Vendian.
		The Vendian, the last period of time in the Precambrian, witnessed the rise of simple organisms such as jellyfish and sea worms.
	www.kinderscience.com /precambrian_era.htm (203 words)

	The Precambrian Era: setting the stage for life
		The Precambrian Era is divided into two parts: the Archaen time and the Proterozoic Era.
		There may not have been many different forms of life, but very important work was being done during the Precambrian Era.
		All of the important work of the Precambrian Era made the Earth ready for what would come next.
	www.fossils-facts-and-finds.com /precambrian_era.html (430 words)

	Precambrian Era
		The emphasis will be on what event led to the conclusion of the time period.
		During the Precambrian, all life forms were restricted to the oceans.
		The Cambrian Explosion brought the Precambrian to a close.
	www.denison.edu /biology/bio380-2001/Precambrian.html (240 words)

	The Paleozoic Era
		In North America the era began with submerged geosynclines, or downward thrusts of the Earth’s crust, along the eastern, southeastern, and western sides of the continent, while the interior was dry land.
		As the era proceeded, the marginal seas periodically washed over the stable interior, leaving sedimentary deposits to mark their incursions.
		Beginning in the Ordovician period, mountain building intermittently proceeded in the eastern part of the Appalachian geosyncline throughout the rest of the era, bringing in new sediments.
	www.science501.com /PTPaleozoic.html (795 words)

	The Precambrian Era (Site not responding. Last check: 2007-10-24)
		The longest period of Earth's history is called the Precambrian Eon.
		Most of the remaining Precambrian rock is igneous (of volcanic origin) or metamorphic and would not preserve fossils.
		These are "stromatolites," layered dome-shaped structures similar to structures that are formed of minerals trapped by some mat-forming colonies of algae in modern times.
	lilt.ics.hawaii.edu /belvedere/materials/Mass-Extinctions/Precamb.htm (95 words)

	Precambrian Paleobiology
		But it was during this Precambrian period when profound events occurred, leading ultimately to "life" as we know it today.
		Stromatolitic structures span the Precambrian and extend to modern time, though they are currently limited to several isolated environments.
		They have been attributed at least in part, because of the intense energy density of oxygen-burning aerobic metabolism of Eukaryotes, with the explosion of diversity in the late Precambrian into the Cambrian (the Cambrian Explosion).
	www.fossilmuseum.net /Paleobiology/Preambrian_Paleobiology.htm (1333 words)

	The Mesozoic Era (Site not responding. Last check: 2007-10-24)
		The great crustal activity that marked the close of the Paleozoic era and the beginning of the Mesozoic era brought about great changes to North America.
		The Appalachian geosyncline, or downward thrust of the Earth’s crust, was replaced by the Appalachian Mountains.
		The eastern part of the continent was elevated during most of the era.
	www.science501.com /PTMesozoic.html (286 words)

	She was precÃ¡mbrica (Site not responding. Last check: 2007-10-24)
		Eye of Precambrian era Precambrian era friends Advantages of Precambrian era.
		He was proterozoic - he was proterozoic: see the precÃ¡mbrica era.
		Era of Archeozoic - era of Archeozoic: see the precÃ¡mbrica era.
	era.webanalsex.com /precambrian-era.htm (732 words)

	Precambrian era
		Precambrian era, name of a major division of geologic time (see
		One of the largest exposed areas of Early Precambrian rocks is the Canadian Shield, where geologist Sir William
		Archeozoic era - Archeozoic era: see Precambrian era.
	www.factmonster.com /ce6/sci/A0840029.html (550 words)

	Untitled (Site not responding. Last check: 2007-10-24)
		The Cretaceous seas withdrew as the earth's crust was being pushed upward during the Laramide Orogeny.
		Because of the irregularity of the process, large blocks were uplifted along steep, northwest-trending fractures in the Precambrian rocks.
		Accompanying the several episodes of uplift and volcanic activity during Tertiary time were several periods of erosion during which the cover of sedimentary rocks that covered the Precambrian core was striped away.
	www.uccs.edu /~geology/rmgeohis.html (3460 words)

	Precambrian Era - ENCYCLOPEDIA - The History Channel UK (Site not responding. Last check: 2007-10-24)
		One of the largest exposed areas of Early Precambrian rocks is the Canadian Shield, where geologist Sir William Logan
		The rocks of this region, and of the Early Precambrian as a whole, are generally granite
		Except as otherwise permitted by written agreement, the following are prohibited: copying substantial portions or the entirety of the work in machine readable form, making multiple printouts thereof, and other uses of the work inconsistent with U.S. and applicable foreign copyright and related laws.
	www.thehistorychannel.co.uk /site/search/search.php?word=Precambr (650 words)

	Precambrian
		The Precambrian world was almost certainly as diverse and complex a place as today's world.
		The Precambrian is not well known or completely understood.
		Most information is from cratons - large portions of continents which have not been deformed since Precambrian or Early Paleozoic time.
	www.gpc.edu /~pgore/geology/geo102/precamb.htm (870 words)

	The First Era - Precambrian Time
		Each era except the most recent is hundreds of millions of years long, so a lot happened.
		In fact, so much happened that we can't even imagine the immensity, but let us try anyway.
		Arizona has moved with the drifting continents, thousands of miles since the Precambrian.
	www.naturescience.org /FirstEra.html (692 words)

	precambrian era concept from the Astronomy knowledge base (Site not responding. Last check: 2007-10-24)
		precambrian era concept from the Astronomy knowledge base
		physical phenomena > event > era > geological era > precambrian era
		Next geological era: cenozoic era Up: geological era Previous geological era: paleozoic era
	www.site.uottawa.ca:4321 /astronomy/precambrianera.html (33 words)

	Precambrian Rocks (Site not responding. Last check: 2007-10-24)
		The rocks highlighted here are the oldest in the United States.
		They formed in Precambrian time, between 4.5 billion and 560 million years ago.
		The oldest Precambrian rocks shown here are about 2.6 billion years old, meaning that they formed during the Archean Era.
	tapestry.usgs.gov /ages/precambrian.html (132 words)

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