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Archaean   Listen

Of or relating to the earliest known rocks formed during the Precambrian Eon.  Synonym: archean.

WordNet 3.0 © 2010 Princeton University

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"Archaean" Quotes from Famous Books

... devoid of fossil remains and so they are called the Azoic or Archaean. They comprise about 30,000 feet of strata which seem to have required at least 20,000,000 years for their formation. This period is roughly two-fifths of the whole time necessary for the formation of all the ...
— The Doctrine of Evolution - Its Basis and Its Scope • Henry Edward Crampton

... greater part of the islands of southern Chile. Lithologically they are crystalline schists, together with granite, diorite, gabbro and other igneous rocks. They are known to be pre-Jurassic, but whether they are Palaeozoic or Archaean is uncertain. They are strongly folded and are overlaid unconformably by Cretaceous and Tertiary deposits. In the north both the Cretaceous and Tertiary beds of this zone are limited in extent, but towards the south Mesozoic beds, which are at least in part Cretaceous, form a band ...
— Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2 - "Chicago, University of" to "Chiton" • Various

... enter an immense canon or gorge, nearly 40 miles long and 300 yards wide, the perpendicular sides of which rise to a height of from 300 to 500 feet. The sides of this canon show it to be hollowed out of solid Archaean rock. Through this canon the water rushes with terrific rapidity, making passage by boat wholly impossible. Many erroneous stories have been told in regard to the height of these falls, all of them greatly exaggerating the descent of the water. The Indians of this locality of the tribe of the Nascopee ...
— Scientific American Supplement No. 822 - Volume XXXII, Number 822. Issue Date October 3, 1891 • Various

Words linked to "Archaean" :   archean, early, geology

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