U.S. GEOLOGICAL SURVEY EIGHTEENTH ANNUAL REPORT PART II PL. XXV RIO GRANDE CANYON AND BOCA OF PECOS CANYON. The bluff in the foreground is covered with a tufaceous incrustation tepetate.

U.S. GEOLOGICAL SURVEY EIGHTEENTH ANNUAL REPORT PART II PL. XXV
RIO GRANDE CANYON AND BOCA OF PECOS CANYON. The bluff in the foreground is covered with a tufaceous incrustation tepetate.

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GEOLOGY OF THE EDWARDS PLATEAU AND RIO GRANDE PLAIN ADJACENT TO AUSTIN AND SAN ANTONIO, TEXAS, WITH REFERENCE TO THE OCCURRENCE OF UNDERGROUND WATERS.
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