Nassau Formation - Rensselaer Graywacke Member

Greenish-gray, plagioclase-rich, blue quartz pebble metagraywacke and minor gneiss-cobble conglomerate.
State Massachusetts
Name Nassau Formation - Rensselaer Graywacke Member
Geologic age Lower Cambrian and Proterozoic Z
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Metasandstone > MetagraywackeGreenish-gray, plagioclase-rich, blue quartz pebble metagraywacke.
Minor
Sedimentary > Clastic > Conglomerateminor gneiss-cobble conglomerate
Comments Part of Taconic-Berkshire Zone (Ordovician and Older Rocks); in the Taconic Allochthon
References
NGMDB product
Counties Berkshire