Williamsport Sandstone  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Silurian
 ....Upper Silurian
 .....Cayugan
 ......Williamsport Sandstone
RTVirginia
 Maryland
 West Virginia
SNIn Maryland, includes Cedar Hill Limestone Member (reallocated). Abruptly overlies calcareous shales of Mackenzie Formation. W Maryland, W Virginia, and N West Virginia.