In this paper the limestones of Devonian and Silurian ages, occupying a stratigraphic position between the Devonian Shales above and the Silurian Shales below, are considered the "Corniferous." Three more or less persistent zones of porosity are recognized in these rocks.

With the increasing demand for natural gas in the eastern industrial area and the rapid drilling of the shale-gas territory, interest in the producing possibilities of the "Corniferous" has once more been revived.

Localized thinning over known fields in the regionally converging "Corniferous" suggests that production is controlled by porous zones of shoreline deposition, and unconformities, that are the result of movements and oscillation of shallow seas on the epi-continental shelf during deposition of the sediments.

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