A series of rocks of the Canadian Shield of early Proterozoic age, rich in iron ore; the period of time during which these were deposited. Usually…
| 单词 | θ5452 |
| 释义 | the world > the earth > structure of the earth > age or period > [noun] > Pre-Cambrian > Proterozoic > specific rocks (1) Animikie1903 A series of rocks of the Canadian Shield of early Proterozoic age, rich in iron ore; the period of time during which these were deposited. Usually… |
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