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Mineral Resources On-Line Spatial Data

Stonehenge Formation

Stonehenge Formation - Medium-light-gray to medium-gray, finely crystalline, thick-bedded limestone, containing dark siliceous laminae, edgewise conglomerate beds, and fossil-fragment lenses; dolomite beds increase in number eastward.
StatePennsylvania
NameStonehenge Formation
Geologic ageOrdovician
Original map labelOs
Primary rock typelimestone
Secondary rock typedolostone (dolomite)
Other rock typesconglomerate
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)medium-light-gray to medium-gray, finely crystalline, thickbedded limestone, containing dark siliceous laminae, and fossil-fragment lenses
Minor
Sedimentary > Carbonate > Dolostone (Bed)medium-light-gray to medium-gray, finely crystalline, thickbedded limestone, containing dark siliceous laminae; dolomite beds increase in number eastward.
Incidental
Sedimentary > Clastic > Conglomerate (Bed)edgewise conglomerate beds
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

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