Poplar Mountain Gneiss

(Probably correlates with Mount Mineral Formation but is more feldspathic) - Dark biotite gneiss containing white microcline megacrysts and beds of quartzite.
State Massachusetts
Name Poplar Mountain Gneiss
Geologic age Proterozoic Z
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Quartzitecontaining white microcline megacrysts and beds of quartzite
Metamorphic > Gneiss > Biotite-gneissdark biotite gneiss
Comments Part of Bronson Hill Zone (Ordovician and Older Rocks)
References
NGMDB product
Counties Franklin