PSL	Pottsville; Permian, Pennsylvanian, coals
RAV	Ravencliff; Princeton, Avis, Mauch Chunk
MAX	Maxton/Maxon
BLM	Blue Monday; Little Lime, Webster Springs, Pencil Cave
BGL	Big Lime; Keener, Union Limestone, Pickaway Limestone
BIJ	Big Injun (Greenbrier, Price ("Pocono"), undifferentiated)
SQU	Squaw; Maccrady, Upper Squaw, undifferentiated Price ("Pocono") units below the Big Injun
WEI	Weir
BER	Berea; Coffee Shale, 2nd Berea, Bedford
GTZ	Gantz; Fifty-foot, Thirty-foot
GOR	Gordon; Gordon Stray, Gordon undifferentiated
FOR	Fourth
FIF	Fifth
BAY	Bayard (Sixth)
SPE	Speechley; Upper Speechley, Elizabeth, Warren, Warren 1st, Warren 2nd, Chemung (Greenland Gap)
BAL	Balltown
RIL	Riley; Bradford, miscellaneous sands between the Riley and Benson
BEN	Benson
ALX	Alexander; Upper Alexander, Lower Alexander, Leopold, Cedar Creek, miscellaneous sands between the Benson and Brallier
BRL	Brallier/Elk; Haverty, Fox
DSH	Devonian shale; undifferentiated shale between the Berea and the Huron, Ohio Shale, Huron, Dunkirk, Java, Angola, Rhinestreet, Cashaqua, Geneseo, other black shales, Harrell, Hamilton, Marcellus, Mahantango
ONO	Onodaga/Oriskany; Huntersville Chert, Needmore, Helderberg, Onesthequaw Group
WIL	Williamsport; Salina
KEE	Keefer; Lockport, Rose Hill
TUS	Tuscarora; Cacapon Sandstone, Ordovician units, Cambrian units