Ontelaunee Formation

Light- to dark-gray, very finely to medium-crystalline dolomite containing interbeds of light-gray limestone; interbedded nodular, dark-gray chert at base.
State Pennsylvania
Name Ontelaunee Formation
Geologic age Ordovician
Lithologic constituents
Major
Sedimentary > Carbonate > Dolostone (Bed)light- to dark-gray, very finely to medium-crystalline dolomite
Minor
Sedimentary > Chemical > Chertinterbedded nodular, dark-gray chert at base
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 Berks - Dauphin - Lancaster - Lebanon