Catoctin Formation

Predominantly a greenstone. Basic lava flows, schist and gneiss, containing chlorite, plagioclase, amphibolite, and epidote. Includes minor quantities of arkose and thin clastics. Western subsurface extension presently unknown.
State West Virginia
Name Catoctin Formation
Geologic age Cambrian/Precambrian
Lithologic constituents
Major
Metamorphic > Metaigneous > Greenstonegreenstone
Minor
Metamorphic > Schist
Incidental
Metamorphic > Amphibolite
Sedimentary > Clastic > Sandstone > ArkoseIncludes minor quantities of arkose and thin clastics
Metamorphic > Gneiss
Comments Thickness: Northeastern - Catoctin Formation (mainly greenstone) 1400 ft.
References

Cardwell, D.H., Erwin, R.B., and Woodward, H.P., 1968 (slightly revised 1986), Geologic Map of West Virginia: West Virginia Geological and Economic Survey, Map 1, East Sheet, scale 1:250,000.

NGMDB product
Counties Jefferson