Field parties based on Mawson in Mac.Robertson Land, Antarctica, during the period from 1957 to 1959 used seismic and gravity methods to determine ice thicknesses on traverses extending 400 miles south from Mawson as far as the southern Prince Charles Mountains. The results confirmed the continental character of this part of Antarctica and showed an average inland ice thickness of about 6000 ft and reaching a maximum of 9271 ft. The maximum seismic velocity recorded in the ice was 12,780 ft/s reached at a depth of 680 ft. A westerly, sub-glacial extension of the northern Prince Charles Mountains was discovered; these, together with the eastern and southern Prince Charles Mountains, form a rim of igneous and metamorphic rocks enclosing a large sedimentary depression on three sides. The western limit of the depression was not explored. North of the sub-glacial range is a deep valley, an expression of a major tectonic event, separating the Framnes and northern Prince Charles Mountains.

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