Ontelaunee Formation

Medium-dark-gray, finely crystalline dolomite, massive to finely laminated; weathers grayish yellow; thick-bedded, dark-gray chert at base.
State Pennsylvania
Name Ontelaunee Formation
Geologic age Ordovician
Lithologic constituents
Major
Sedimentary > Carbonate > Dolostone (Bed)medium-dark-gray, finely crystalline dolomite, massive to finely laminated; weathers grayish yellow
Minor
Sedimentary > Chemical > Chert (Bed)thick-bedded, dark-gray chert at base
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 Lehigh - Northampton