A variety of sedimentary and igneous rocks has been identified in specimens collected from 11 nunataks in southern Antarctica, including a marine sandstone dated as Cretaceous on paleontologic evidence. The disturbed attitude of the beds in the outcrops and lithologic associations indicate that the nunataks and associated ranges were developed in a marine mobile belt, subjected to volcanic and orogenic activity, and are part of a folded mountain chain forming a continuation of the folded ranges in the northern part of the region.

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