Abstract
ONE of the problems in antarctic geology has been the uncertain stratigraphic position of the Cambrian Archæocyathid limestone found as erratics on the Beardmore Glacier1,2 and dredged from the Weddell Sea3. Probably the Beardmore erratics came from the Mt. Buckley limestone at the head of the glacier; but the field relationships of this limestone are uncertain. In recent syntheses by Fairbridge4 and Harrington5 the limestone is left in an uncertain position between the flat-lying Beacon Sandstone, and the underlying steeply dipping Ross System of Harrington. The Beacon Sandstone has yielded upper Palæozoic and Mesozoic fossils, and the Ross System is usually considered pre-Cambrian.
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