Brallier and Harrell Formations, undivided

In descending order: Brallier--medium-gray, planar-bedded siltstone interbedded with light-olive shale; sparse marine fauna; Harrell--black shale (Burket Member) and dark-gray shale.
State Pennsylvania
Name Brallier and Harrell Formations, undivided
Geologic age Devonian
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone (Bed)Brallier--medium-gray, planar-bedded siltstone
Sedimentary > Clastic > Mudstone > Shale (Bed)Brallier--interbedded with light-olive shale; with sparse marine fauna and dark-gray shale.
Minor
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)Harrell--black shale (Burket Member)
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 - Franklin - Fulton - Huntingdon - Juniata - Lycoming