Stowe Formation (VTOCAs;0)

Stowe Formation - Quartz-sericite (muscovite-paragonite)-chlorite phyllite and schist; porphyroblasts of albite, garnet, chloritoid, or kyanite common locally; includes phyllitic graywacke north of Lamoille River. Schist contains abundant segregations of granular white quartz. The Stowe Formation in the study are contains two unnamed members: a silvery green schist and a greenstone. The schist is a fine-grained, silvery to dark green quartz-muscovite-albite-chlorite schist. It is in fault contact with the black phyllite of the Ottauquechee Formation. The greenstone is a homogenous, fine-grained, light green actinolite-albite-epidote-calcite-chlorite schist. Large outcrops of the resistant greenstone are common. Age according to map symbols is Proterozoic and Cambrian. Unit is correlated with the Rowe Schist (of Zen, 1983). [Rowe Schist on 1983 MA map is Cambrian and Ordovician. No explanation here for older age.] (Walsh, 1992).

State	Vermont
Name	Stowe Formation
Geologic age	Cambrian-Ordovician
Original map label	OCs
Comments	Part of Green Mountains Secondary unit description per VT014.
Primary rock type	phyllite
Secondary rock type	mica schist
Other rock types	graywacke
Lithologic constituents	Major Metamorphic > SchistQuartz-sericite (muscovite-paragonite)-chlorite phyllite and schist; porphyroblasts of albite, garnet, chloritoid, or kyanite common locally. Schist contains abundant segregations of granular white quartz. Metamorphic > Metasedimentary > Metaclastic > PhylliteQuartz-sericite (muscovite-paragonite)-chlorite phyllite and schist; porphyroblasts of albite, garnet, chloritoid, or kyanite common locally. Incidental Sedimentary > Clastic > Sandstone > Graywackeincludes phyllitic graywacke north of Lamoille River
Map references	Nicholson, S.W., Dicken, C.L., Horton, J.D., Foose, M.P., Mueller, J.A.L., and Hon, Rudi, 2006, Preliminary integrated geologic map databases for the United States: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, Rhode Island, and Vermont: U.S. Geological Survey Open-File Report 2006-1272. [http://pubs.er.usgs.gov/publication/ofr20061272]
Unit references	Doll, C.G., Cady, W.M., Thompson, J.B., Jr., and Billings, M.P., 1961, Centennial Geologic Map of Vermont: Vermont Geological Survey, Miscellaneous Map MISCMAP-01, scale 1:250,000. Walsh, G.J., 1992, Bedrock geology of the Fayston-Buels Gore area, central Vermont: Vermont Geological Survey Special Bulletin, no. 13, 74 p., scale 1:24,000.
Geographic coverage	Addison - Lamoille - Orange - Orleans - Rutland - Washington - Windham - Windsor