The Field.

Location and general Features.—The Mannington oil field is situated in Marion county, West Virginia, on the main line of the Baltimore and Ohio railway. It is an extension of the Mount Morris (Pennsylvania) field, which begins just north of the West Virginia state line and trends in a belt of varying width southwestward across Marion and Monongalia counties to the edge of Harrison county. Dolls run, Pedlars run, Jakes run, Fairview and Mods run are centers of development along the belt, which as now defined is from half a mile to three miles wide and about 35 miles long.

The cross section on the accompanying map (plate 6) shows that the oil belt in question is found on the western slope of the Indiana anticline, and is from 15 to 20 miles distant from the great axis of Chestnut ridge. The dip is northwestward, and varies from . . .

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