What is "chockstone"

Usage examples of "chockstone".

This went on for about fifty feet, and then, after a rather awkward chockstone, I came to a fork.

The first trouble was a chockstone, which I managed to climb round, and then the confounded thing widened and became perpendicular.

Every breach in the stillness was perfectly clear--the steady scraping in the chimney, the fall of a fragment of rock as he surmounted the lower chockstone, the scraping again as he was forced out on to the containing wall.

At the great chockstone, which called for delicate climbing, there was a bad moment when it caught in a crevice overhead.

Then suddenly there was a chockstone, a great boulder that had rolled down the cliff and jammed in the chimney, it formed a level floor embraced on two sides by buttresses of rock, invisible from the bottom of the valley.

Andrea climbed the fifty-degree face behind the chockstone untill he found another boulder.

With immense labour I found a chockstone above my head, and managed to force my foot free.

In his haste he did not notice that the nylon line was not rewinding itself, and when the chockstone, on which he'd just put his entire weight, gave way beneath his foot, his instinctive terror was tempered by the thought that his fall would be brief.