Onondaga Formation through Poxono Island Formation, undivided

In descending order: Onondaga Formation--gray calcareous, sandy shale; Ridgeley Formation--brown sandstone; Rondout Formation--gray interbedded limestone, dolomite, and shale; Decker Formation--gray calcareous sandstone, and Andreas Red Beds at top; Bossardville Limestone--gray, mud-cracked shaly limestone; Poxono Island Formation--olive-gray, calcareous and dolomitic shale, siltstone, and sandstone.
State Pennsylvania
Name Onondaga Formation through Poxono Island Formation, undivided
Geologic age Devonian and Silurian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed, Calcareous)Onondaga Formation--gray calcareous, sandy shale; Rondout Formation--gray interbedded limestone, dolomite, and shale; Bossardville Limestone--gray, mud-cracked shaly limestone; Poxono Island Formation--olive-gray, calcareous and dolomitic shale, siltstone, and sandstone.
Sedimentary > Carbonate > Limestone (Bed)Rondout Formation--gray interbedded limestone; Bossardville Limestone--gray, mud-cracked shaly limestone
Sedimentary > Clastic > Sandstone (Bed, Calcareous)Ridgeley Formation--brown sandstone; Decker Formation--gray calcareous sandstone; Poxono Island Formation--olive-gray, calcareous and dolomitic shale, siltstone, and sandstone.
Minor
Sedimentary > Carbonate > Dolostone (Bed)Rondout Formation--gray interbedded limestone, dolomite, and shale; Poxono Island Formation--olive-gray, calcareous and dolomitic shale
Sedimentary > Clastic > Siltstone (Bed)Poxono Island Formation--olive-gray, calcareous and dolomitic shale, siltstone, and sandstone.
Sedimentary > Clastic (Bed)Decker Formation--Andreas Red Beds at top;
References

Berg, T.M., Edmunds, W.E., Geyer, A.R., and others, compilers, 1980, Geologic map of Pennsylvania: Pennsylvania Geological Survey, 4th ser., Map 1, 2nd ed., 3 sheets, scale 1:250,000.

Pennsylvania Bureau of Topographic and Geologic Survey, Department of Conservation and Natural Resources, Miles, C.E., and Whitfield, T.G., compilers, 2001, Bedrock Geology of Pennsylvania, edition: 1.0, digital map, scale 1:250,000.

NGMDB product
Counties Lebanon - Schuylkill