Geology. Designating wholly crystalline rocks and unstratified formations, believed to have been formed in the earliest geological period. Cf. primary…
| 单词 | θ5330 |
| 释义 | the world > the earth > structure of the earth > age or period > stratigraphic units > [adjective] > pre-Cambrian (17) primitive1779 Geology. Designating wholly crystalline rocks and unstratified formations, believed to have been formed in the earliest geological period. Cf. primary… primordial1794 Geology. = primitive, adj. 8. Obsolete. primary1795 Geology. Originally: designating rocks believed to have been formed before the appearance of life on the earth; = primitive, adj. 8. In later use… 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… 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:— specific (11) |
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