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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.
StatePennsylvania
NameRockdale Run Formation
Geologic ageOrdovician
Original map labelOrr
Primary rock typelimestone
Secondary rock typedolostone (dolomite)
Other rock typeschert
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)mostly limestone; stromatolitic limestone in middle; pinkish marbleoid limestone and chert at base.
Minor
Sedimentary > Carbonate > Dolostone (Bed)
Sedimentary > Chemical > Chert (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
Geographic coverageCumberland - Dauphin - Franklin - Fulton

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=PAOrr;20
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