Stop No. 21, Steeply Dipping Upper Freeport Coal.
Ninth Int'l Cong of Carboniferous Stratigraphy and Geology 1979 May; :27-28
Coalbeds that dip nearly vertically have not previously been seen in Pennsylvania west of the allegheny front. This paper discusses some steeply inclined coalbeds that were observed during a field trip west of West Bolivar, Westmoreland County, Pennsylvania
Ninth Int'l. Cong. of Carboniferous Stratigraphy and Geology. May 10-June 2, 1979, PP. 27-28