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Rockdale Run Formation

Rockdale Run Formation - Mostly limestone; some dolomite interbeds; some chert near middle and top; stromatolitic limestone in middle; pinkish marbleoid limestone and chert at base.
State Pennsylvania
Name Rockdale Run Formation
Geologic age Ordovician
Primary rock type limestone
Secondary rock type dolostone (dolomite)
Other rock types chert
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)mostly limestone; stromatolitic limestone in middle; pinkish marbleoid limestone and chert at base.
Minor
Sedimentary > Chemical > Chert (Bed)
Sedimentary > Carbonate > Dolostone (Bed)
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
Counties Cumberland - Dauphin - Franklin - Fulton