Brunswick Formation

Reddish-brown mudstone, siltstone, and shale, containing a few green and brown shale interbeds; red and dark-gray, interbedded argillites near base. Youngest beds in Brunswick may be Jurassic in age.
State Pennsylvania
Name Brunswick Formation
Geologic age Triassic
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone (Bed)Reddish-brown mudstone, interbedded argillites near base.
Minor
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Incidental
Metamorphic > Metasedimentary > Metaclastic > ArgilliteReddish-brown mudstone, interbedded argillites near base.
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 Berks - Bucks - Chester - Lehigh - Montgomery