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Sweetsburg Formation

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Black to gray, graphitic, quartzose phyllite and schist, with tan-weathering layers and pods of gray dolostone and black quartzite. Cover rocks of the Saint Albans area.
State Vermont
Name Sweetsburg Formation
Geologic age Lower Ordovician and Cambrian?
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > PhylliteBlack to gray, graphitic, quartzose phyllite and schist.
Metamorphic > SchistBlack to gray, graphitic, quartzose phyllite and schist.
Minor
Sedimentary > Carbonate > Dolostone (Lens, Bed)Tan-weathering layers and pods of gray dolostone.
Metamorphic > Metasedimentary > Metaclastic > QuartziteBlack quartzite.
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 Chittenden - Franklin