escarps

The river seemed to cut its way through rocky ranges, and to receive many tributaries; had, in some places, bergs, and margins of ancient gravel and sedimentary strata; in others, rocky escarps of great height, presented sections of rocks through which it passed.

Journal of an Expedition into the Interior of Tropical Australia 2003

For breaching fortifications, on the other hand, curved fire is necessary; the escarps of modern fortresses are usually covered from view by screens of earth or masonry in front, so that the projectiles must pass over the crest of the screen, and drop sufficiently to strike the wall about half-way down, that is to say, at an angle of 15° to 20°.

Scientific American Supplement, No. 324, March 18, 1882 Various

-- The river seemed to cut its way through rocky ranges, and to receive many tributaries; had, in some places, bergs, and margins of ancient gravel and sedimentary strata; in others, rocky escarps of great height, presented sections of rocks through which it passed.

Journal of an Expedition into the Interior of Tropical Australia Thomas Mitchell 1823

a cannon, contemplating the escarps and bastions of the citadel.

The Grey Cloak Harold MacGrath 1901