高抗压强度的硬地层，如硬石灰岩。燧岩。硬砂岩。石英岩。石英砂。玄武岩。花岗岩等极硬岩层。
Medium hard formation with high compressive strength. Such as limestone, taconite, blaize, quartzite, silica sand, basalt, granite ect.
琅勃拉邦魔鬼山金矿床，赋存于上古生界泥盆系砂、板岩和二叠系石灰岩中。
The Ghost Mountain Au deposit of Luangprabang exists in the Upper Palaeozoic Devonian sandstone, SLATE and Permian limestone.
潜江凹陷潜江组粒屑碳酸盐岩性主要发育鲕粒石灰岩、砂屑灰岩、泥晶砂屑云岩、藻团块灰岩等。
The grained Carbonate rocks of Qianjiang Formation in Qianjiang Sag can be divided into oolitic limestone, sand-clastic limestone, mud-crystal sand-clastic dolomite, alga-gobbet limestone etc.
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