Named the Roaring Spring Member of the Salona Formation for Roaring Spring, Blair Co., central PA. Consists of interbedded, laminated and cross-laminated, fine-grained calcarenite which constitutes about 20 percent of member and argillaceous calcilutite which comprises about 60 percent of member. Thickness is 76 feet at type locality. Overlies the New Enterprise Member of the Salona and underlies the Milesburg Member of the Coburn Formation. The Roaring Spring is of Middle and Late Ordovician age.

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

Salona Formation is recognized throughout the Valley and Ridge province in central PA and in the subsurface in western PA, northwestern VA, and eastern WV. Unit is predominantly a dark-gray limestone containing thin interbeds of black calcareous shale. New Enterprise Member (lower member) consists of an interbedded sequence of dark-gray to grayish-black homogeneous calcisiltite and calcareous shale. Beds are nearly nonfossiliferous, with only rare brachiopods and trilobites. Five ash beds present in this member. Upper Roaring Spring Member is distinguished from lower member by the presence of ripples and cross-bedding in calcisiltite and calcarenite. One ash bed present in Roaring Spring. Salona gradationally overlies Rodman Formation and conformably underlies the Coburn Formation. Thickness of 55+/-5 m measured at the New Enterprise Stone and Gravel Company quarry at Roaring Spring. New Enterprise Member is 38 m, while the Roaring Spring Member is 18 m. No basis given for the Late Ordovician age assignment.

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