099 Pound Gap where most of this photograph is of the middle and lower portions of the Mississippian Grainger Formation; here composed of alternating relatively continuous to occasionally shallowly channeled beds of sand with uniform sharp bedding planes and shale; both lithologies vary in thickness and the sands often exhibit Bouma sequences suggesting deposition from turbidite currents that were active over a mid to outer fan setting. The lower portion of the formation is shale rich and probably from a deeper water setting and a more distal portion of the fan.