Ledger Formation

Light-gray, locally mottled, massive, pure, coarsely crystalline dolomite; siliceous in middle part.
State Pennsylvania
Name Ledger Formation
Geologic age Cambrian
Lithologic constituents
Major
Sedimentary > Carbonate > Dolostonelight-gray, locally mottled, massive, pure, coarsely crystalline dolomite; siliceous in middle part.
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 Adams - Berks - Chester - Lancaster - Montgomery - Philadelphia - York