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You can double click on a word to look it up on TermGallery.
You can double click on a word to look it up on TermGallery.
Meanings of archean in English
The time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life.
Usage of archean in English
1
The archean age, during which the brooding seems to have gone on, was probably as long as all the ages since.
2
The period following on after Archean time is called, by geologists, Paleozoic time.
3
Others divide the Precambrian into two eras, the very ancient Archean and the more recent Proterozoic.
4
Archean rocks form the cores of the ancient crystalline masses within the littoral zone from Algiers to Bona.
5
Rocks of Archean age cover wide areas in the interior, in West and East Africa and across the Sahara.
6
A theory held by many refers the ultimate source of the iron to the igneous rocks of the Archean.
7
Together, the data paint a picture of Archean evolution that is one of early development of morphological and chemical complexity.
8
If it were in the Archean, this whole blog might be a few words arranged nonsensically and a fragment of an out-of-focus photo.
9
Racing to the line with him and finishing just behind him was ARCHEAN (5) who was also held up for a run.
10
Our knowledge is far too meager to warrant an attempt to draw the varying outlines of sea and land during the Archean and Algonkian eras.