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	Cambrian Period: World of Earth Science
		Cambrian is the name given to a period of time in Earth's history (i.e., Cambrian Period), which spanned 570–510 million years ago.
		Cambrian is the initial period of the Paleozoic Era.
		Numerous Cambrian reefs, patch reefs, and shallow-water mounds were formed by stromatolites, a layered mass of sediment formed by the daily trapping and binding action of a symbiotic growth of blue-green algae and bacteria.
	science.enotes.com /earth-science/cambrian-period (970 words)

	Cambrian - Wikipedia, the free encyclopedia
		The Cambrian is a major division of the geologic timescale that begins about 542 mya (million years ago) at the end of the Proterozoic eon and ended about 488.3 Ma with the beginning of the Ordovician period (ICS, 2004).
		The lower boundary of the Cambrian was traditionally set at the earliest appearance of early arthropods known as trilobites and of primitive reef-forming animals known as archeocyathids.
		Cambrian continents are thought to have resulted from the breakup of a neoproterozoic supercontinent called Rodinia.
	en.wikipedia.org /wiki/Cambrian (975 words)

	Cambrian Period - Search Results - MSN Encarta
		At the beginning of the Cambrian period (570 million to 500 million years ago) animal life was entirely confined to the seas.
		The waters of the Cambrian period appear to have been widespread and shallow.
		CAMBRIAN PERIOD 570-505 Million Years Ago: The Cambrian period of the Paleozoic era was...
	encarta.msn.com /Cambrian_Period.html (195 words)

	Ordovician - Wikipedia, the free encyclopedia
		The Ordovician period is the second of the six (seven in North America) periods of the Paleozoic era.
		Lapworth, recognizing that the fossil fauna in the disputed strata were different from those of either the Cambrian or the Silurian periods, realized that they should be placed in a period of their own.
		By the end of the period, Gondwana had neared or approached the pole and was largely glaciated.
	en.wikipedia.org /wiki/Ordovician (983 words)

	The Geology of Ohio--The Cambrian
		As the Cambrian sea continued to flood the long-emergent craton during the opening of the Iapetus Ocean, the waters deepened across Ohio and carbonate deposition began in eastern Ohio as the Rome Formation, which is primarily dolomite, accumulated.
		Traditionally, the Cambrian is known as the Age of Trilobites because these arthropods constitute perhaps 60 percent of the fossils known from this system and have proved to be wonderful index fossils for comparative dating and correlation of rock units.
		Although Ohio's Cambrian rocks constitute the least well known Paleozoic system in the state because they are nowhere exposed at the surface, our knowledge of them is increasing rapidly because of intensive exploration and drilling activities for hydrocarbons and their suitability for disposal of liquid industrial wastes.
	www.dnr.state.oh.us /geosurvey/oh_geol/97_winter/cambrian.htm (3015 words)

	Cambrian - Search Results - MSN Encarta
		Cambrian Mountains, region in Wales, occupying much of the principality.
		Cambrian Period, first division of the Paleozoic Era of the geologic time scale, spanning an interval of about 46 million years, from 542 million to...
		Evolution, overview, Cambrian Period, evolution of complex life during Cambrian Period, new body plans for animals, picture of Cambrian life,...
	ca.encarta.msn.com /Cambrian.html (96 words)

	Cambrian
		The Cambrian Period is the earliest period in whose rocks large numbers of fossils of organisms more complex than algae are found.
		The Cambrian Period follows the Neoproterozoic and is followed by the Ordovician Period.
		It is thought that Cambrian climates were significantly warmer than those of preceding times which experienced extensive ice ages discussed as the Varanger glaciation.
	www.ebroadcast.com.au /lookup/encyclopedia/ca/Cambrian.html (621 words)

	Cambrian Period
		This page describes the Cambrian Period, including stratigraphy, the fossil record, and the phenomenon known as the “Cambrian explosion.” Three famous lagerstätten — Chengjiang, Sirius Passet and the Burgess Shale — are briefly discussed, followed by a sketched outline of some of the major fossil groups.
		The period occupies a special place in the study of paleontology, because it is in the sediments of Cambrian age that fossils ‘suddenly’ become common for the first time.
		Bengtson, Stefan; Zhao, Yue 1997: Fossilized Metazoan Embryos from the Earliest Cambrian.
	www.peripatus.gen.nz /paleontology/Cambrian.html (4724 words)

	The Cambrian Time Period
		Cambrian The cambrian time period is the time that most of the major groups of animals first appeared in the fossil records.Also known as the "Cambrian Explosion", because of the relatively short time over which this diversity of forms appear.
		Stratigraphy of the Cambrian Period The stratigraphic boundaries are determined the occurences of fossils.
		The Tectonics of the Cambrian During the point of the Cambrian period the land was known as the Rodinia.
	www.angelfire.com /sc3/skward5/tamika.html (435 words)

	The Cambrian in North America
		The Cambrian Period, the first period of the Paleozoic Era ("era of ancient life"), was named in 1835 by the British geologist Adam Sedgwick.
		The Cambrian came to a close with a mass extinction that decimated 75% of the trilobite families, half the sponge families, and a significant portion of the brachiopods and snails.
		Cambrian sediments are also widely exposed in the Great Basin, which was continental shelf half a billion years ago, and much of whose land is owned by the BLM today.
	www.fossilnews.com /2004/cambrian/cambrian.html (2983 words)

	Cambrian Summary
		The Cambrian is a major division of the geologic timescale that begins about 542 mya (million years ago) at the end of the Proterozoic eon and ended about 488.3 Ma with the beginning of the Ordovician period (ICS, 2004).
		The lower boundary of the Cambrian was traditionally set at the earliest appearance of early arthropods known as trilobites and of primitive reef-forming animals known as archeocyathids.
		Cambrian continents are thought to have resulted from the breakup of a neoproterozoic supercontinent called Rodinia.
	www.bookrags.com /Cambrian (2583 words)

	Prehistoric Life - What is a fossil? (Site not responding. Last check: 2007-10-26)
		The period is therefore known as the 'Coal Age'.
		The Devonian Period is often called the 'Age of Fishes' because of the evolution and spread of sharks and bony fish.
		The Cambrian is sometimes called the 'Age of Trilobites', as these were one of the most dominant life forms.
	www.museum.vic.gov.au /prehistoric/what/eras.html (749 words)

	Cambrian HSU NHM
		The Cambrian* Period begins the Phanerozoic Eon, the last 542 million years during which fossils with hard parts have existed, is the first division of the Paleozoic Era (251 - 542mya).
		Cambrian animals were organized into a unique marine fauna, one of three recognized during the Phanerozoic.
		A relatively common Cambrian fossil is the brachiopod.
	www.humboldt.edu /~natmus/lifeThroughTime/Cambrian.web/index.html (705 words)

	GeoFacts No. 20, The Geology of Ohio--The Cambrian
		The beginning of the Cambrian Period about 570 million years ago is marked by the sudden, widespread appearance of multicellular marine animals having hard parts capable of fossilization.
		Were it not for this dramatic occurrence, the 65-million-year-long Cambrian Period would not be regarded as the beginning of a new, and perhaps the most significant, era in the history of the Earth.
		As the Cambrian sea continued to flood the craton during the opening of the Iapetus Ocean, the waters deepened across Ohio, and carbonate deposition began in eastern Ohio as the Rome Formation accumulated.
	www.dnr.state.oh.us /geosurvey/geo_fact/geo_f20.htm (1568 words)

	fUSION Anomaly. Cambrian Explosion
		Cambrian Period, first division of the Paleozoic era of the geologic time scale, spanning an interval of about 70 million years, from 570 million to 500 million years ago.
		Cambrian period seas teemed with marine invertebrate animal life, including sponges, worms, bryozoans, hydrozoans, brachiopods, mollusks, primitive arthropods such as the trilobite, and stalked echinoderms.
		The Cambrian is the earliest geologic period for which science has sufficient evidence to hypothesize the existence and attributes of crustal plates.
	fusionanomaly.net /cambrianexplosion.html (415 words)

	Palaeos Paleozoic: Cambrian: The Cambrian Period - 1
		The Cambrian Period was named in 1835 by the geologist Adam Sedgwick, after the region of Cambria in North Wales, where rocks of this age were first found.
		During the 53 million years that the Cambrian period lasted there was the sudden appearance and diversification of almost every major group (phylum) of animal life, as well as many types that later died out.
		The most characteristic animals of the Cambrian period were the trilobites, a primitive form of arthropod remarkable for it's highly developed eyes (unusual in such an early organism).
	www.palaeos.com /Paleozoic/Cambrian/Cambrian.htm (2818 words)

	Cambrian period. The Columbia Encyclopedia, Sixth Edition. 2001-05
		In the United States, Lower Cambrian formations are found in the Appalachian; the sandstones near Waucoba Springs, S Calif.; and the thick layers of conglomerates and sandstones in Georgia, Tennessee, and North Carolina.
		In Russia, the Cambrian beds are remarkable in that they comprise mostly undisturbed and unconsolidated sand and clay despite their great age.
		The sudden appearance of highly developed and diversified fauna in Cambrian rock is best explained by the assumption that more primitive forms flourished during a missing stratigraphic interval between the close of the Precambrian era and the beginning of the Cambrian.
	www.bartleby.com /65/ca/CambrianPer.html (408 words)

	Ordovician Period
		This period saw the origin and rapid evolution of many new types of invertebrate animals which replaced their Cambrian predecessors.
		The fossil record of this period is amazingly intact in the Great Basin of California, Utah and Nevada and affords an almost unprecedented opportunity to learn about the conditions that favor innovation in biodiversity.
		Cambrian animals were predominately crawling mud-grubbers and detrivores with a few swimming and burrowing predators thrown in.
	www.peripatus.gen.nz /paleontology/Ordovician.html (2874 words)

	Wikinfo \| Cambrian (Site not responding. Last check: 2007-10-26)
		The Cambrian Period is the earliest period in whose rocks numerous large, distinctly-fossilizable multicellular organisms more complex than sponges or medusoids are found.
		Thus the Cambrian Period follows the Neoproterozoic and is followed by the Ordovician Period.
		Exactly at the Cambrian boundary there is a marked fall in the abundance of carbon-13, a 'reverse spike' that palaeontologists call an 'excursion', It is so widespread that it is the best indicator of the position of the Precambrian-Cambrian boundary in stratigraphic sequences of roughly this age.
	www.wikinfo.org /wiki.php?title=Cambrian (919 words)

	The Cambrian Explsion
		While this does not necessarily entail that all animal phyla came into existence during the Cambrian explosion – some scientists believe that the "explosion" was a change in climate that produced conditions favorable for the fossilization of preexisting phyla – the evidence for a period of astounding diversification of life is overwhelming.
		The animals that made their abrupt appearance during the Cambrian explosion are ancestors of virtually all the creatures that swim, fly, and crawl today.
		The Cambrian rocks of the geologic column contain a proliferation of complex life; however, no trace of predecessors to such complex and sometimes offbeat organisms is to be found in Precambrian rocks.
	www.angelfire.com /tn/tifni/misc/cambrianexplosion.html (1045 words)

	Cambrian Period
		The Cambrian Period is the first period of the Paleozoic Era spanning from approximately 540 to 500 million years ago.
		Rocks of Cambrian age are distributed in the Great Basin (the largest desert in the US) of the western United States, parts of the northeastern United States, Wales, Scandinavia and the Baltic region, Siberia, and China, among other places.
		The most characteristic animals of the Cambrian period were the trilobites, a primitive form of arthropod remarkable for it's highly developed eyes (unusual in such an early organism) and their exoskeletons of chitin.
	www.denison.edu /biology/bio380-2001/Cambrian.html (1269 words)

	The Palaeozoic Era.
		It is the longest period of the Palaeozoic era.
		The Carboniferous period is the time during which most of the world's coal deposits were laid down, the coal being formed from compressed layers of rotting vegetation.
		It is the earliest period of the Palaeozoic era.
	www.bobainsworth.com /fossil/palaeozoic.htm (870 words)

	Timerock Fossils, Minerals & Crystals - Geological Periods - Description
		During the Ordovician Period, most of the land mass of the Earth was in the super-continent of Gondwana while the northern Hemisphere was almost entirely ocean.
		Periods of glaciation during the Carboniferous Period, caused vast amounts of plant material from the forests to be preserved at great pressures under ice and water.
		At the end of the Cretaceous Period, came the fifth and most recent of the "great extinctions", probably caused by an asteroid about 6 miles (10 km) in diameter striking the Earth on the Yucatan coast of Mexico.
	www.timerock.com /timerock/library/time/geological_periods.htm (1112 words)

	Life During the Cambrian Period
		Finally, the Cambrian saw the appearance and/or diversification of mineralized algae of various types, such as the coralline red algae and the dasyclad green algae.
		Cambrian echinoderms were predominantly unfamiliar and strange-looking types such as early edrioasteroids, eocrinoids, and helicoplacoids.
		And while jawless vertebrates were present in the Cambrian, it was not until the Ordovician that armored fish became common enough to leave a rich fossil record.
	www.ucmp.berkeley.edu /cambrian/camblife.html (571 words)

	The Cambrian Period (Site not responding. Last check: 2007-10-26)
		The Cambrian Period marks an important point in the history of life on earth; it is the time when most of the major groups of animals first appear in the fossil record.
		It was once thought that the Cambrian rocks contained the first and oldest fossil animals, but these are now to be found in the earlier Vendian strata.
		The Cambrian Period is part of the Paleozoic Era.
	www.ucmp.berkeley.edu /cambrian/camb.html (272 words)

	Cambrian and Ordovician Rocks (Site not responding. Last check: 2007-10-26)
		They formed in the Cambrian Period, between 560 and 504 million years ago, and the Ordovician Period, between 504 and 438 million years ago.
		The Cambrian Period is the earliest division of the Paleozoic Era, followed by the Ordovician period.
		During the Cambrian, life began to bloom in the Earth's oceans.
	tapestry.usgs.gov /ages/cambrian.html (97 words)

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