词条 | mudstone |
释义 | mudstone rock sedimentary rock composed primarily of clay- or silt-sized particles (less than 0.063 mm 【0.0025 inch】 in diameter); it is not laminated or easily split into thin layers. Some geologists designate as mudstone any similar rock that is blocky or massive; others, however, prefer a broader definition that includes all of the members of the shale group. See also siltstone. |
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