| Summary: | Submitted to the U.S. National Committee for the IGY, National Academy of Sciences, in partial fulfillment of IGY Project Number 4.10 - NSF Grant No. Y/4.10/285. Rock specimens from newly-discovered mountain masses and nunataks in Marie Byrd Land, Antarctica, are described. Four chemical analyses of volcanic rocks from Mt. Takahe are presented. The volcanic specimens, identified as oligoclase andesite, reflect a marginal-continental occurrence, typical of the Circum-Pacific volcanoes. Petrographic, lithologic, and structural evidence suggest that the Sentinel Mountains structure can be extended for about 200 miles south-westward to Mt. Johns and Mt. Ewing. Detailed petrographic descriptions of 80 thin sections are presented. National Science Foundation Grant No. Y/4.10/285.
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