Somerset Reservoir Granite - rapakivi granite and pegmatitic granite

Light-pinkish-gray-weathering, biotite-microcline-perthite or porphyritic rapakivi granite and pegmatitic granite; where deformed is a mylonitic augen gneiss. 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 - rapakivi granite and pegmatitic granite
Geologic age Neoproterozoic
Lithologic constituents
Major
Igneous > Plutonic > Granitic > GraniteLight-pinkish-gray-weathering, biotite-microcline-perthite or porphyritic rapakivi granite and pegmatitic granite.
Minor
Metamorphic > Metasedimentary > ParagneissWhere deformed is a mylonitic augen gneiss.
Comments Original unit label is Y3Ccbsr, but age listed as Neoproterozoic. Changed label to ZCcbsr.
References
NGMDB product
Counties Windham