Tonalite gneiss

Medium-gray- to light-gray-weathering, biotite (±hornblende) tonalite gneiss exposed on Torment Hill in Weston; probably correlative with the Baileys Mills tonalitic gneiss or the Felchville trondhjemite facies (Y1fg) of the Chester dome, but undated. South Londonderry Igneous Suite (Middle and Early Mesoproterozoic) (1,393±9 Ma to 1,309±6 Ma). Mount Holly Complex intrusive rocks. Rocks of the Green Mountain and Lincoln Mountain massifs and eastern domes.
State Vermont
Name Tonalite gneiss
Geologic age Early Mesoproterozoic
Lithologic constituents
Major
Metamorphic > Metasedimentary > ParagneissMedium-gray- to light-gray-weathering, biotite (±hornblende) tonalite gneiss.
References
NGMDB product
Counties Rutland - Windsor