Irish Valley Member of Catskill Formation

Nonmarine, grayish-red siltstone and mudstone, and gray and grayish-red sandstone interbedded with minor, thin, light-olive-gray marine siltstone; arranged in fining-upward cycles. Lower part of member has conglomeratic sandstones.
State Pennsylvania
Name Irish Valley Member of Catskill Formation
Geologic age Devonian
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone (Bed)
Minor
Sedimentary > Clastic > Mudstone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Incidental
Sedimentary > Clastic > Mixed-clastic > Conglomerate-sandstone (Bed)Lower part of member has conglomeratic sandstones.
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 Blair - Columbia - Dauphin - Fulton - Huntingdon - Juniata - Lebanon - Luzerne - Montour - Northumberland - Perry - Schuylkill - Snyder - Union