Somewhat more than a year ago Dr. Thomas C. Poulter, second in command and senior scientist of Byrd Antarctic Expedition II, brought to the Geophysical Laboratory, Carnegie Institution of Washington, a small collection of volcanic rocks from Antarctica. Preliminary examination showed certain rather unusual features that appeared worthy of full investigation.

The paper that follows embodies the results. It represents essentially a laboratory study of features inherent in the rocks themselves, independent of their source, but a brief description of their occurrence is a desirable introduction. This information has been supplied by Poulter.

In the course of an exploratory expedition from the base camp to the Raymond Fosdick Mountains, under the leadership of Paul A. Siple, an extinct volcano was discovered in the easternmost portion of the range. This received the designation “Volcano 116,” and apparently has not been given a more definite name.

The rocks . . .

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