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Dalton Formation

Dalton Formation - Well-layered orange-tan feldspathic, biotite-spotted, muscovite-microcline-quartz gneiss and granofels.
StateMassachusetts
NameDalton Formation
Geologic ageLower Cambrian and Proterozoic Z
Original map labelEZdg
CommentsPart of Taconic-Berkshire Zone (Ordovician and Older Rocks)
Primary rock typegneiss
Secondary rock typegranofels
Other rock types
Lithologic constituents
Major
Metamorphic > Granoblastic > GranofelsWell-layered orange-tan feldspathic, biotite-spotted, muscovite-microcline-quartz gneiss and granofels.
Metamorphic > Gneiss > Biotite-gneissWell-layered orange-tan feldspathic, biotite-spotted, muscovite-microcline-quartz gneiss and granofels.
Map references
Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.
Unit references
Zen, E-An (ed.), Goldsmith, R. (comp.), Ratcliffe, N.M. (comp.), Robinson, P. (comp.), Stanley, R.S. (comp.), Hatch, N.L., Jr., Shride, A.F., Weed, E.G.A., Wones, D.R., 1983, Bedrock Geologic Map of Massachusetts: U.S. Geological Survey, Reston, VA, scale 1: 250,000.

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