Shaw Mountain Formation

White to yellowish-gray quartz-pebble conglomerate and conglomeratic quartzite, having clasts of milky-white quartz as much as 2.5 cm in diameter in a white to tan quartzite matrix, in beds 0.5 to 1 m thick; and yellowish-gray to light-gray phyllitic quartzite, quartz-pebble to -granule phyllite, and steel-gray to tan vitreous quartzite in beds as much as 5 m thick. Part of the Connecticut Valley Trough.
State Vermont
Name Shaw Mountain Formation
Geologic age Upper to Lower Silurian
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > QuartziteWhite to yellowish-gray quartz-pebble conglomerate and conglomeratic quartzite; steel-gray to tan vitreous quartzite in beds as much as 5 m thick.
Sedimentary > Clastic > ConglomerateWhite to yellowish-gray quartz-pebble conglomerate and conglomeratic quartzite.
Minor
Metamorphic > Metasedimentary > Metaclastic > PhylliteYellowish-gray to light-gray phyllitic quartzite, quartz-pebble to -granule phyllite.
References
NGMDB product
Counties Orleans - Washington - Windham - Windsor