Chopawamsic Formation - Mafic to intermediate metavolcanic rocks

Dark greenish-gray, fine- to medium-grained, foliated, lineated, amphibole-bearing gneiss and schist. Also includes tuffaceous volcaniclastic rocks. Mineralogy: amphibole + acicular actinolite + epidote + chlorite + titanite + plagioclase + magnetite.
State Virginia
Name Chopawamsic Formation - Mafic to intermediate metavolcanic rocks
Geologic age Cambrian
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanicintermediate to mafic metavolcanic
Minor
Igneous > Volcanic (Pyroclastic-tuff)Also includes tuffaceous volcaniclastic rocks.
Comments Central Virginia Volcanic-Plutonic Belt
References

Virginia Division of Mineral Resources, 1993, Geologic Map of Virginia: Virginia Division of Mineral Resources, scale 1:500,000.

Virginia Division of Mineral Resources, 2003, Digital Representation of the 1993 Geologic Map of Virginia, Publication 174, CD ROM (ISO-9660) contains image file, expanded explanation in pdf, and ESRI shapefiles, scale 1:500,000.

NGMDB product
Counties Fluvanna - Goochland