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
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 > Mudstone > Shale
Sedimentary > Clastic > Siltstone
Incidental
Sedimentary > Clastic > Conglomeratelocally conglomeratic in lower part
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, Miles, C.E., and Whitfield, T.G., compilers, 2001, Bedrock Geology of Pennsylvania, edition: 1.0, digital map, scale 1:250,000.

NGMDB product
Counties Bedford - Blair - Centre - Clinton - Cumberland - Dauphin - Franklin - Fulton - Huntingdon - Juniata - Lebanon - Lycoming - Mifflin - Montour - Northumberland - Perry - Snyder - Union