Mahantango Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Devonian
 ....Middle Devonian
 .....Mahantango Formation
RTPennsylvania
 Hamilton Group
SNCentral Pennsylvania. In Hamilton Group. Consists principally of greenish-gray, thin- to medium-bedded slightly carbonaceous shale. Sporadic sandstone zones appear throughout area and thicken eastward. In central Pennsylvania.