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Example sentences from the Web for archean
Yet either is inconsiderable against the total lapse of time even from the Archean's close till now.
At one time these rocks were regarded as Archean gneisses of a special type.
Two important ones, however—namely, Archean and Algonkian—are of American birth.North America|Israel C. Russell
A theory held by many refers the ultimate source of the iron to the igneous rocks of the Archean.The Elements of Geology|William Harmon Norton
We are looking now at the close of the era which geologists call Archean, because it is ancient beyond knowledge.