Evidence is presented to show that the recrystallized rocks of the Comanchean series vary from limestone to dolomites; that the faunal content has not governed the degree of dolomitization; that dolomites are distributed irregularly through the series; that unaltered limestones are present at various horizons; and that porosity is not a function of dolomitization or faunal content, but rather a function of recrystallization either with or without dolomitization.

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