Dalton Formation

Tan weathering, muscovite-microcline quartzite and feldspathic quartzite rich in black tourmaline, locally includes thin beds of other rock types listed below.
State Massachusetts
Name Dalton Formation
Geologic age Lower Cambrian and Proterozoic Z
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > QuartziteTan weathering, muscovite-microcline quartzite and feldspathic quartzite rich in black tourmaline.
Comments Part of Taconic-Berkshire Zone (Ordovician and Older Rocks). Locally includes thin beds of the following units: CAZdbs, CAZdq, CAZdg, CAZds, and CAZdc
References
NGMDB product
Counties Berkshire - Hampden