Precambrian

A geological term denoting the time in Earth history prior to 570 million years ago.
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Precambrian

The Precambrian is the geological time period before the Cambrian period (before 540 million years ago). It is the time period from when the Earth formed until simple life-forms evolved.
Found on http://www.enchantedlearning.com/subjects/dinosaurs/glossary/

Precambrian

[n] - the geological era before about 544 million years ago
Found on http://www.webdictionary.co.uk/definition.php?query=Precambrian

Precambrian

Precambrian eon noun the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
Found on https://www.encyclo.co.uk/local/20974

Precambrian

Span of geologic time that dates from 4.6 billion to 570 million years ago. Made up of three geologic eras: Hadean, Archean, and Proterozoic.
Found on http://www.physicalgeography.net/physgeoglos/p.html

Precambrian

Credit: US Geological Survey The earliest and longest period of geologic time, extending from the formation of the Earth (4.5 billion years ago) to about 543 million years ago when the Paleozoic era began. The Precambrian accounts for about 90% of geologic time. It has been divided according to...
Found on http://www.daviddarling.info/encyclopedia/P/Precambrian.html

Precambrian

Precambrian, name of a major division of geologic time (see Geologic Timescale, table), from c.5 billion to 570 million years ago. It is now usually divided into the Archean and Proterozoic eons. Precambrian time includes 80% of the earth's history.Precambrian rocks are mostly covered by rock system...
Found on http://www.infoplease.com/ce6/sci/A0840029.html

Precambrian

All geologic time before the beginning of the Paleozoic era. This includes about 90% of all geologic time and spans the time from the beginning of the earth, about 4.5 billion years ago, to 544 million years ago. Its name means 'before Cambrian.'
Found on https://www.encyclo.co.uk/local/21202

Precambrian

All geologic time from the beginning of Earth history to 570 million years ago. Also refers to the rocks that formed in that epoch.
Found on http://www.encyclo.co.uk/local/21455

Precambrian

The Precambrian (or Pre-Cambrian) is the large span of time in Earth`s history before the current Phanerozoic Eon, and is a Supereon divided into several eons of the geologic time scale. It spans from the formation of Earth about 4600 million years ago (Ma) to the beginning of the Cambrian Period, about {Geologic Ages Inline|Cambrian} Ma, when ma....
Found on http://en.wikipedia.org/wiki/Precambrian

precambrian

the geologic time period that begins with the earth's creation and stretches to 590 million year ago
Found on http://www.njwildlifetrails.org/OutontheTrails/GlossaryofNaturerelatedTerms

precambrian

All geologic time, and its corresponding rocks, before the beginning of the Paleozoic; it is equivalent to about 90% of geologic time. Precambrian time has been divided according to several different systems, all of which use the presence or absence of evidence of life as a criterion.
Found on http://www.encyclo.co.uk/local/22047

Precambrian

An informal term to include all geologic time from the beginning of the Earth to the beginning of the Cambrian period 570 million years ago.
Found on https://www.encyclo.co.uk/local/22327

precambrian

Geologic time (4567 to 542 mya) from the beginning of the Earth to the beginning of the Cambrian Period of the Paleozoic Era.
Found on http://www.scientificpsychic.com/etc/geology-glossary.html

Precambrian

The period of time before animals with skeletons and shells had evolved. It stretched from the formation of the Earth about 4600 million years ago to 545 million years ago.
Found on http://www.bgs.ac.uk/discoveringGeology/glossary.html

Precambrian

The division of geologic time from the formation of the earth (about 4.5 billion years ago) to the beginning of the Cambrian period of the Paleozoic era (about 600 million years ago). Also, the rocks formed during that time. Precambrian time constitutes about 90% of the earth's history.
Found on http://www.evcforum.net/WebPages/Glossary_Geology.html

Precambrian

Informal term describing 7/8 of geologic time from the beginning of the earth to the beginning of th
Found on http://www.superglossary.com/Glossary/Science/Biology/

Precambrian

All geologic time from the beginning of Earth history to 570 million years ago. Also refers to the rocks that formed in that epoch.
Found on http://volcano.oregonstate.edu/glossary/1
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