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释义
the world > the earth > structure of the earth > age or period > [adjective] > pre-Cambrian (9)
Protozoic1838

Designating rocks which contain fossils of the most primitive forms of life, or the period in which they were deposited; of or relating to this…

prozoic1845

Designating rocks characterized by an absence of fossils and regarded as having been formed before the emergence of life on earth; of or relating to…

Precambrian1864

Of, relating to, or designating the earliest division of geological time, from the formation of the earth, believed to have been about 4,600…

Cryptozoic1911

Designating the eon before the beginning of the Cambrian period (about 542 million years ago), equivalent to the Precambrian period; of or relating…

Subcategories:

— Archaean (2)
— proterozoic (3)
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更新时间:2025/2/9 15:02:09