. Annual Reports of the Department of the Interior for the Fiscal Year Ended June 30, 1900--Twenty-First Annual Report of the United States Geological Society. ^ is another layer of clay about 6 feet in thickness, contain-ing many limestone bowlders. These vary in diameter from 1 to *ifeet, and are evidently residual, having characteristic irregular solu- VENTY-FIRST ANNUAL REP. r^r^

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