A thin layer, typically consisting of clay of volcanic origin, separating or delimiting thicker strata of rock.
| 单词 | θ6292 |
| 释义 | the world > the earth > minerals > mineral deposits > features of stratum or vein > [noun] > material between > between ore (2) wayboard?1644 A thin layer, typically consisting of clay of volcanic origin, separating or delimiting thicker strata of rock. white-row1665 (more fully white-row grains) a stratum of black iron-ore particles in a white clayey matrix. |
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