Both ends can be used, and the pick end is also good for working on soft rocks, like chalk.
It bores, however, not only into clay, but also into soft rocks in order to effect a permanent lodgment.
The soft rocks were thus etched away until broad valleys were formed.
Where hard rocks abound, the valleys are steep and narrow; where soft rocks occur, the valleys are broad and low.
Large rock masses commonly slide where steep cliffs form in soft rocks that are capped by hard resistant rocks.
In many of the soft rocks the imprints of the feet of men and animals are still plainly visible.
In these circumstances, and for soft rocks, the diamond bit may be replaced by a steel toothed bit.
Holes were made in the soft rocks, and pieces of spars were inserted, to answer for posts.