There are 2 Cow Run Sands. Both are layers of oil and gas rich material. Notes below from "Oil and Gas Horizons of West Virginia".
I Cow Run (Little Dunkard) Sand.—At about 425 feet below the Pittsburgh coal there belongs an oil and gas producing stratum that has been designated by the drillers as the First Cow Run sand in Washington county, Ohio, and later, the Little Dunkard, in southeastern Greene county. This horizon correlates with the Buffalo sandstone of the Conemaugh series and not the Saltsburg as has been worked out in detail by the writer on pages 281-285 of the Wirt- Roane-Callioun Rept. of the State Survey.
This sand is at present producing gas from three wells in the town of Westover, Monongalia county, which were drilled for water but proved to be gaseous. Each has sufficient pressure to provide domestic fuel for a household. There are two pays in the sand, the upper one being found about 100 feet underground and the lower one about 140 feet.
II Cow Run Sand.—This sand, belonging at the top of the Pottsville series, 825 to 850 feet below the Pittsburgh coal, and correlating with the Homewood sandstone, has produced a large amount of oil both in Ohio and West Virginia. Its true correlation has been worked out in detail by the writer in its type locality at Cow Run, Washington county, Ohio, and published on pages 287-290 and 281-285 of the Wirt- Roane-Calhoun Report of the State Survey. It is frequently mistaken for the Salt sand, 25 to 50 feet lower in the measures, and many of the oil and gas shows reported by drillers in the latter horizon probably belong in the II Cow Run.
Historical Marker is located on Rt 7 just a couple of miles west of Kingwood. Nothing related to the Cow Run Sand to photograph nearby.
Same Marker - Side #2. Could use some TLC.
The marker is situated in a most UN-scenic location, right next to the garbage dumpster
[EDIT: This marker has been repainted and moved across the highway to a more "presentable" location. Here are a few photos taken on 13 August 2011:
New photo - 13 Aug 2011
New photo - 13 Aug 2011. The marker (now on the left side of the photo) was previously located across the highway by the 2 garbage dumpsters.
New photo - 13 Aug 2011. View on Rt 7 eastbound looking towards Kingwood.