PSVL	Pottsville
MCCK	Mauch Chunk
GRBR	Greenbrier
BGIJ	Big Injun
PRCE	Price ("Pocono") sands
CSKL	Catskill sands & silts
CMNG	Chemung (Greenland Gap) sands & silts
DVSH	Devonian shales
ONDG/ORSK	Onondaga/Oriskany
WLMP	Williamsport
KEFR	Keefer
TCRR	Tuscarora and deeper