A small rugose coral bioherm has been exhumed from the surrounding Pennsylvanian shale in which it was buried. The resulting topography in the vicinity of the bioherm appears to be that of the Pennsylvanian sea floor when the bioherm was laid down.

Location.—The bioherm is in the Mercury Quadrangle, McCulloch County, Texas (Fig. 1), and was reported by W. A. Jenkins, Jr. (1952, p. 50 and geologic map). It is 13 mile west of Highway 283 and 238 miles south of the bridge across the Colorado River on Highway 283 (Brownwood-Brady), highway distance. The...

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