Of the 72 samples collected at 5 locations, three-fourths showed textural evidence of secondary porosity. On the basis of the geologic setting and history of the area, we reason that this porosity developed as a consequence of deep-burial diagenesis and not as a consequence of recent exhumation and weathering. Although the average porosity of 7 percent is not impressive, the high of 34 percent suggests that reservoir-potential rock volumes are present. The possible widespread development of secondary porosity suggests that the Jackfork merits attention as a gas-reservoir rock.

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