1) Aeon 2) Precambrian aeon 3) Precambrian eon 4) Precambrian period
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1) Azoic
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https://www.crosswordclues.com/clue/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....
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http://en.wikipedia.org/wiki/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.
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http://volcano.oregonstate.edu/glossary/1
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...
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http://www.daviddarling.info/encyclopedia/P/Precambrian.html
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.
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
All geologic time from the beginning of Earth history to 570 million years ago. Also refers to the rocks that formed in that epoch.
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http://www.encyclo.co.uk/local/21455
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.
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http://www.encyclo.co.uk/local/22047
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.
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http://www.evcforum.net/WebPages/Glossary_Geology.html
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.
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http://www.physicalgeography.net/physgeoglos/p.html
Geologic time (4567 to 542 mya) from the beginning of the Earth to the beginning of the Cambrian Period of the Paleozoic Era.
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http://www.scientificpsychic.com/etc/geology-glossary.html
A geological term denoting the time in Earth history prior to 570 million years ago.
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http://www.solarviews.com/eng/terms.htm
[
n] - the geological era before about 544 million years ago
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http://www.webdictionary.co.uk/definition.php?query=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
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https://www.encyclo.co.uk/local/20974
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.'
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https://www.encyclo.co.uk/local/21202
the geologic time period that begins with the earth's creation and stretches to 590 million year ago
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https://www.encyclo.co.uk/local/21787
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.
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https://www.encyclo.co.uk/local/22327
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.
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https://www.encyclo.co.uk/local/23001
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