Massive white sandstone and quartz conglomerate here named for occurrence on Pinkerton Knob in Berkeley Co., WV. Cross-bedded, in part, with thin coal seam. Thickness at type is 125 ft; greater elsewhere. Uppermost formation of Pocono group. Overlies Myers shale. Contains Pocono plants. Age is Mississippian.

Source: GNU records (USGS DDS-6; Reston GNULEX).

On the basis of paleobotanical studies, it seems that the age of the Pinkerton and other post-Hedges formations should be restudied. Lithologic evidence favors correlation of the Myers with Mauch Chunk, and Pinkerton with basal Pennsylvanian.

Source: GNU records (USGS DDS-6; Reston GNULEX).

The Meadow Branch synclinorium, Berkley Co., WV, is composed of five formations: Rockwell, Purslane, Hedges, Myers, and Pinkerton, for many years assigned to the Pocono Group. The three basal units are retained as Early Mississippian (Kinderhookian and Osagean). Only the Purslane is correlative with the original Pocono Formation of northeastern PA. The Myers Shale is now correlated with the Late Mississippian (Meramecian) Maccrady Formation. The areal extent of the Pinkerton is much greater than originally believed. Strata previously mapped as Rockwell and Purslane in the southern part of the Meadow Branch synclinorium is now shown to be Pinkerton with a thickness of 350 m. Unit cannot be correlated beyond Meadow Branch synclinorium. Stratigraphic position indicates that it belongs between the Maccrady and Greenbrier at the regional unconformity. Age is Late Mississippian (Meramecian).

Source: GNU records (USGS DDS-6; Reston GNULEX).