Wills Creek Formation

Variegated gray, grayish-red, yellowish-gray and greenish-gray, interbedded calcareous shale, siltstone, shaly limestone, and dolomite; passes into Bloomsburg Formation in the southeast; not present east of Harrisburg.
State Pennsylvania
Name Wills Creek Formation
Geologic age Silurian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Calcareous)
Minor
Sedimentary > Carbonate > Dolostone (Bed)
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Carbonate > Limestone (Bed)
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 Bedford - Blair - Columbia - Franklin - Fulton - Huntingdon - Juniata - Lycoming - Mifflin - Montour - Northumberland - Perry - Snyder - Union