The porosity of the Oriskany Sandstone [Lower Devonian] in Kanawha County represents original pore space partially reduced by compaction and incomplete cementation. The most porous samples were low in clastic carbonate. Leaching of carbonate did not occur as pores are lined by well formed secondary quartz growths. Quartz faces next to carbonate are typically imperfect. The clastic carbonate is normally of sand size; yet voids of this size apparently never developed. Preliminary studies also indicate that extensive leaching did not occur in other parts of the Oriskany Sandstone.