Ice-shelf

All planes reached the old base on the eventing of the next day —January 27th—after a swift non-stop flight; and on the 28th we made McMurdo Sound in two laps, the one pause being very brief, and occasioned by a faulty rudder in the furious wind over the ice-shelf after we had cleared the great plateau.

Source: wiktionary

But he found no Alaloi, and he urged his dogs carefully across the crevasses of the Fairleigh ice-shelf, back out onto the sea.

Source: wiktionary

Thunderous roars warned us that the whole ice-shelf had entered a hyperactive phase, causing hitherto safe snow-bridges to collapse all around us into their crevasses.

Source: wiktionary