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
NGMDB product
Counties Windham