Geological observations made in Mane Byrd Land, West Antarctica, during 1959-1960, show that the region is dominated by extinct volcanoes in the form of isolated nunataks projecting through the ice cap. The Executive Committee Range, the Crary Mountains, and Toney Mountain consist mainly of andesite, basalt, and trachyte flows. Mount Petras is composed of felsic tuffs and flows. The Clark Mountains consist of hornfels and felsic intrusive rocks.

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