Several Pennsylvanian informal members and sandstone lentils are introduced in this report. Tradewater Formation in the Goreville quad. is subdivided into two informal mapping units, the lower Tradewater and the upper. The informal Bethlehem sandstone lentil occupies the approximate middle of the upper Tradewater. The top of the lower Tradewater is mapped as the top of the Murray Bluff Sandstone Member (a correlative of the Bernadotte Sandstone Member of Willman, 1975). The remainder of the lower Tradewater is subdivided into the ascending informal Ferne Clyffe member, Cedar Creek sandstone lentil, and Lake of Egypt member. The Reynoldsburg Coal Bed is near the base of the Ferne Clyffe. Ferne Clyffe otherwise consists of gray siltstones and micaceous, silty gray to dark gray shales that contain interbeds and lenses of thin-bedded, fine-grained, argillaceous sandstone. No good exposures were found, but two drill cores penetrate the entire interval. Unit varies in thickness from 30 to 45 ft. Overlies the Pounds Sandstone Member of the Caseyville Formation. Age of the Ferne Clyffe shown as Middle Pennsylvanian (Morrowan). [Morrowan here considered to be Early and Middle Pennsylvanian.]

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