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…
单词 | θ5404 |
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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