低抗压强度的软到中等地层，如中软页岩。中软石灰岩。中软砂岩。和软硬研磨性夹层的中等地层。

Low compressive strength of soft to medium formations. Such as soft shale, soft limestone, soft sandstone, hard and soft abrasive interbedded medium formation.

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低抗压强度的软地层，如泥岩。石膏。盐岩。软页岩。软石灰岩。砂岩。

Low compressive strength of the soft formation, such as mudstone, gypsum, gypsum, soft shale, soft limestone, sandstone.

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一些砂岩是如此均匀和软表示，他们有能力接受最详细的雕刻和花丝工作。

Some of The Sandstones Are So Homogeneous and Soft That They Are Capable of Receiving Most Elaborate Carving and Filigree Work.

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