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Tuscarora Formation

Tuscarora Formation - Light- to medium-gray quartzite and quartzitic sandstone and minor interbedded shale and siltstone, locally conglomeratic in lower part; includes (to the northwest) interbedded red and non-red sandstone (Castanea Member) at top; east of Harrisburg, equivalent to Minsi and Weiders Members of Shawangunk Formation.
State Pennsylvania
Name Tuscarora Formation
Geologic age Silurian
Primary rock type quartzite
Secondary rock type sandstone
Other rock types shale; siltstone; conglomerate
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Minor
Sedimentary > Clastic > Sandstonelight- to medium-gray quartzitic sandstone; includes (to the northwest) interbedded red and nonred sandstone (Castanea Member) at top
Sedimentary > Clastic > Siltstone
Sedimentary > Clastic > Mudstone > Shale
Incidental
Sedimentary > Clastic > Conglomeratelocally conglomeratic in lower part
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 Bedford - Blair - Centre - Clinton - Cumberland - Dauphin - Franklin - Fulton - Huntingdon - Juniata - Lebanon - Lycoming - Mifflin - Montour - Northumberland - Perry - Snyder - Union