There are 294 specimens in the Antarctic rock and mineral collections at the University of Michigan. Dr. Laurence M. Gould, geologist of the Byrd Antarctic Expedition, collected 103 of these specimens in South Victoria, Marie Byrd, and King Edward VII Lands. The remainder represents duplicate material collected by the National Antarctic, Terra Nova, Australasian Antarctic, Scottish Antarctic (1902-04), German South Polar (1901-03), French Antarctic (1903-05), and Swedish Antarctic Expeditions obtained in exchange by the University. Of the 178 specimens studied 152 thin sections have been examined qualitatively. Ninety-four thin sections have had their mineral constituents determined quantitatively by means of the recording micrometer. Fourteen new chemical analyses are added to the 158 previously recorded analyses of rocks from the Antarctic Continent and the Antarctic Archipelago. Analyses f, i, m, q, s, and t in Tables I and II have been previously recorded.

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