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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 period following on after Archean time is called, by geologists, Paleozoic time.
2
Others divide the Precambrian into two eras, the very ancient Archean and the more recent Proterozoic.
3
Rocks of Archean age cover wide areas in the interior, in West and East Africa and across the Sahara.
4
A theory held by many refers the ultimate source of the iron to the igneous rocks of the Archean.
5
Together, the data paint a picture of Archean evolution that is one of early development of morphological and chemical complexity.
6
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.
7
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.
8
Archean rocks form the cores of the ancient crystalline masses within the littoral zone from Algiers to Bona.
9
The archean age, during which the brooding seems to have gone on, was probably as long as all the ages since.
10
Racing to the line with him and finishing just behind him was ARCHEAN (5) who was also held up for a run.