The time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life.
Sinônimos
Examples for "Archean"
Examples for "Archean"
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.
1
Appears to indicate, as I suspected, that earth has seen whole cycle or cycles of organic life before known one that begins with Archæozoic cells.