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Underhill Formation, Battell Member

Underhill Formation, Battell Member - Carbonaceous sericite-quartz-albite-chlorite schist and schistose quartzite, also carbonaceous and noncarbonaceous limestone; quartz-sericite-chlorite-albite schist. (Northern and Central Vermont). The Battell is raised to Formation rank by T.R. Armstrong (in press) [not in bibliography] to describe graphitic schists with carbonates that depositionally overlie the Monastery Formation in the Granville-Hancock area of central VT. The name Battell Formation is tentatively assigned in this report to a distinct group of graphitic rocks with limited occurrence in the study area. The basal portion of the Battell is assigned by Armstrong to the White River Member (new name) and following that nomenclature, the White River is the only part of the Battell seen in the Fayston-Buels Gore area. The White River appears to be in fault contact with the Underhill Formation along the eastern boundary of the Underhill in Buels Gore. The member also appears to be in depositional contact with the Monastery Formation at all observed locations and occurs as small bodies within the schists of the Monastery (Walsh, 1992).
StateVermont
NameUnderhill Formation, Battell Member
Geologic ageCambrian
Original map labelCub
CommentsPart of Green Mountains, Camels Hump Group Secondary unit description per VT014. The Underhill lies stratigraphically above basement rocks of Mount Holly Complex of Grenville (1 b.y.) age. Age changed to Late Proterozoic and(or) Early Cambrian (Slack and others, 1988) per VT020.
Primary rock typemica schist
Secondary rock typequartzite
Other rock typeslimestone
Lithologic constituents
Major
Metamorphic > SchistCarbonaceous sericite-quartz-albite-chlorite schist and schistose quartzite; quartz-sericite-chlorite-albite schist.
Minor
Sedimentary > Carbonate > Limestonealso carbonaceous and noncarbonaceous limestone
Metamorphic > Metasedimentary > Metaclastic > Quartziteschistose quartzite
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.
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.
Slack, J.F., Atelsek, P.H. and Grosz, A.E., 1988, Geology and geochemical survey of the Bristol Cliffs Wilderness, Addison County, Vermont: U.S. Geological Survey Miscellaneous Field Studies Map, MF-1593-A, 1 sheet, scale 1:24,000.
Geographic coverageAddison - Rutland - Washington - Windsor

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