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Northfield Formation - quartzite, grit, and conglomerate member

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Dark-gray quartz-pebble metawacke and gray quartzite and conglomerate at base of the Northfield Formation, south of Springfield. Part of the Connecticut Valley Trough.
State Vermont
Name Northfield Formation - quartzite, grit, and conglomerate member
Geologic age Lower Devonian and Upper Silurian
Lithologic constituents
Major
Sedimentary > Clastic > ConglomerateGray quartzite and conglomerate.
Metamorphic > Metasedimentary > Metaclastic > Metasandstone > MetagraywackeDark-gray quartz-pebble metawacke.
Metamorphic > Metasedimentary > Metaclastic > QuartziteGray quartzite and conglomerate.
Comments On the printed map the unit label is DSnq, but in the GIS it is Snq. Changing to DSnq to match the printed map; Snq is a mistake according to Greg Walsh (oral communication 2012).
References

Ratcliffe, N.M., Stanley, R.S., Gale., M.H., Thompson, P.J., and Walsh, G.J., 2011, Bedrock geologic map of Vermont: U.S. Geological Survey Scientific Investigations Map 3184, 3 sheets, scale 1:100,000.

https://pubs.er.usgs.gov/publication/sim3184
NGMDB product
Counties Windham - Windsor