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BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Pennsylvanian
 .....Lower Pennsylvanian
 ......Lee Formation
RTVirginia
 Kentucky
 Tennessee
SNIncludes Rockcastle Sandstone. Defined as all of lower Pennsylvanian rocks from Mississippian-Pennsylvanian contact to top of Zachariah Coal Bed. E Kentucky, E Tennessee, and SW Virginia.