Beaufort Island, remnant of a Quaternary volcano in the Ross Sea, Antarctica

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Abstract
Beaufort Island, near the entrance to McMurdo Sound, is a remnant of a basaltic cone of about Last Interglacial age. More than three-quarters of it was quarried away by extensions of the Ross Ice Shelf or by glaciers during the Last Glaciation, leaving the remainder essential unmodified. Agglomerates, lavas, and tuffs of the cone rest unconformably on a pediment of horizontal tuffs and fine agglomerates, which show features that are either frozen-ground involutions or contortions caused by collapse of ice-tuff sandwiches. On the northern shore there is a c1iffed bench at a height of about 25 ft. Its age and origin are uncertain but it could be a c1iffed talus cone formed about 700 A.D., or a true marine bench formed about 5000 B.C. and since raised by post-glacial isostatic rebound of Antarctica.

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