Partridge Formation - metarhyolite

Greenish-gray, light-bluish-gray, or medium-bluish-gray metarhyolite tuff, lapilli tuff, tuff breccia, and lava. Generally porphyritic with 5 to 20 percent plagioclase and, in some places, quartz phenocrysts and minor amphibolite. Stratified rocks of the Bronson Hill arch and Sawyer Mountain belt.
State Vermont
Name Partridge Formation - metarhyolite
Geologic age Upper Ordovician
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanic > MetarhyoliteGreenish-gray, light-bluish-gray, or medium-bluish-gray metarhyolite tuff, lapilli tuff, tuff breccia, and lava.
Incidental
Metamorphic > Amphibolite
References
NGMDB product
Counties Windham