Skip to main content

Ontelaunee Formation

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
Primary rock type dolostone (dolomite)
Secondary rock type chert
Other rock types
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
Map references
Pennsylvania Bureau of Topographic and Geologic Survey, Department of Conservation and Natural Resources, 2001, Bedrock Geology of Pennsylvania, edition: 1.0, digital map. Retrieved from internet 9-30-2004; <http://www.dcnr.state.pa.us/topogeo/map1/bedmap.aspx> DL Data: pageoexp.zip
Unit 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, 2001, Bedrock Geology of Pennsylvania, edition: 1.0, digital map. Retrieved from internet 9-30-2004; <http://www.dcnr.state.pa.us/topogeo/map1/bedmap.aspx> DL Data: pageoexp.zip