Weverton and Loudoun Formations, undivided

In descending order: Weverton--gray to purplish-gray quartzite and quartzose conglomerate containing rounded pebbles. Loudoun--sericitic slate and purplish-gray, crumbly, poorly sorted, arkosic sandstone and conglomerate.
State Pennsylvania
Name Weverton and Loudoun Formations, undivided
Geologic age Cambrian
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > QuartziteWeverton--gray to purplish-gray quartzite
Minor
Sedimentary > Clastic > Sandstone > ArkoseLoudoun--purplishgray, crumbly, poorly sorted, arkosic sandstone
Sedimentary > Clastic > ConglomerateWeverton--gray to purplish-gray quartzose conglomerate containing rounded pebbles. Loudoun--conglomerate.
Metamorphic > Metasedimentary > Metaclastic > SlateLoudoun--sericitic slate
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 Adams - Cumberland - Franklin - York