At the semiannual meeting of the American Association of Petroleum Geologists in Denver, October 26-28, 1922, Wallace Pratt read a paper on the Amarillo district.1 Recently Sidney Powers2 has published a section showing that a buried felsite hill exists beneath the John Wray dome.

Subsequent developments have shown that the supposed felsite is in fact a sill, or sills, of rhyolite or trachite porphyry. These sills have been reported in the Amarillo Oil Company’s Masterson No. 3, at 2,738 feet; in their Masterson No. 5, at 2,229 feet; also in their Bivins No. 3, at 2,372 feet; and...

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