Type section and description: The Camp Run Member of the New Albany Shale was named by Lineback (1968, 1970) for exposures of greenish- to olive-gray shale interbedded with brownish-black pyritic fissile shale along the south side of Indiana Highway 311 at the Interstate Highway 65 overpass west of Sellersburg, Clark County, Ind. (W¼S¼ lot 110, Clark's Grant). The name was taken from Camp Run, a nearby creek.
Lying above the Morgan Trail Member of the New Albany Shale and below the Clegg Creek Member, the Camp Run Member is fairly uniform in thickness throughout the shallow subsurface in southeastern Indiana and ranges from 24 to 28 feet (7.3 to 8.5 m) in thickness (Hasenmueller, 1982). Dolomite concretions as large as 2 feet (0.6 m) in diameter are commonly found in the darker beds. The contact between the Camp Run Member and the underlying Morgan Trail Member is easily recognized in cores, but this contact is difficult to distinguish when using well cuttings or geophysical logs. Therefore, this member has not been mapped in most of the subsurface of Indiana.
Correlation: On the basis of conodonts the Camp Run is correlated with part of the Grassy Creek Shale of Illinois (Lineback, 1968). It is stratigraphically equivalent to part of the Grassy Creek Member of the New Albany Shale in northwestern Kentucky (Hasenmueller and Bassett, 1981) and to the middle part of the Gassaway Member of the Chattanooga Shale of Tennessee (Lineback, 1970; Hasenmueller and others, 1983).