Somerset Reservoir Granite - aplitic to pegmatitic granite (VTZCbsa;0)

Somerset Reservoir Granite - aplitic to pegmatitic granite

White to pinkish-gray, medium-grained plagioclase-microcline-perthite aplitic to pegmatitic granite forms dikes in country rocks and irregular border facies. U-Pb zircon upper-intercept age of 965±4 Ma, no. 19 (Karabinos and Aleinikoff, 1990). Cardinal Brook Intrusive Suite (965±4 Ma to 945±7 Ma). Rocks of the Green Mountain and Lincoln Mountain massifs and eastern domes.

State	Vermont
Name	Somerset Reservoir Granite - aplitic to pegmatitic granite
Geologic age	Neoproterozoic
Lithologic constituents	Major Igneous > Plutonic > Granitic > Leucocratic-granitic (Dike or sill)White to pinkish-gray, medium-grained plagioclase-microcline-perthite aplitic to pegmatitic granite forms dikes in country rocks and irregular border facies.
Comments	Original unit label is Y3Cbsa, but age listed as Neoproterozoic. Changed label to ZCbsa.
References	Ratcliffe, N.M., Stanley, R.S., Gale., M.H., Thompson, P.J., and Walsh, G.J., 2011, Bedrock geologic map of Vermont: U.S. Geological Survey Scientific Investigations Map 3184, 3 sheets, scale 1:100,000. https://pubs.er.usgs.gov/publication/sim3184
NGMDB product	NGMDB product page for 96860
Counties	Windham

Somerset Reservoir Granite - aplitic to pegmatitic granite

Ratcliffe, N.M., Stanley, R.S., Gale., M.H., Thompson, P.J., and Walsh, G.J., 2011, Bedrock geologic map of Vermont: U.S. Geological Survey Scientific Investigations Map 3184, 3 sheets, scale 1:100,000.