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

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。

youdao

The limestone, sandstone and shale of this area were soft.

这个地区的灰岩、砂岩和页岩都是很柔软的。

youdao

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

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。

youdao

A soft rock called sandstone began moving under this pressure.

VOA: special.2009.04.15

Sandstone is a soft rock.

VOA: special.2009.07.20

The area is popular for school field trips because students can hunt for fossils in the soft sandstone cliffs, said Michael Rutzick, who was at the park Wednesday and lives in nearby Mendota Heights.

NPR: 1 Child Dead, 1 Missing In Minn. Park Landslide