138 F³.
E. V. d’Invilliers, 1889.
outcrop. The formation as a whole seems to become rather more shaly westward in Snyder county, and there have been no important quarries opened in it with the possible exception of one or two in the vicinity of Troxelville in Adams township of Snyder county. Westward to that point the limestone ridge barely holds its own, in some places being scarcely noticeable.
