Canyon Group  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Pennsylvanian
 .....Upper Pennsylvanian
 ......Canyon Group
RTUnited States
 Texas
SNIncludes Graford Formation, Winchell Limestone, Brad Formation, and Caddo Creek Formation. Central and N central Texas.