粗砂岩顶板
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Coarse sandstone roof
以上为机器翻译结果,长、整句建议使用 人工翻译 。
吕家坨井田西翼部分区域八煤层顶板由正常的粉砂岩变为粗中砂岩,并有煤层变薄现象。
In the part of west flank of Lujiatuo minefield, the normal siltstone roof of coal seam 8 changed into coarse to medium-grained sandstone, and also had phenomenon of coal seam pinch-out.
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