Mineral Resources On-Line Spatial Data
Mineral Resources > Online Spatial Data > Geology > by state > Vermont
|Geologic age||Devonian - Silurian|
|Original map label||DSn|
|Comments||Part of Eastern Vermont Secondary unit description per VT007. The Northfield Formation in the West Dover and Jacksonville quadrangles, VT consists of gray to dark-gray, graphitic, garnet-chlorite-quartz-muscovite-pyrite schist and phyllite. Locally, unit includes 10 cm to 1 m thick vitreous, white-weathering, light-gray quartzite with abundant blue quartz grains. Lower part of unit is locally intruded by the Whitneyville facies of the North River Igneous Suite. The Northfield is of Silurian(?) and Devonian age (Ratcliffe and Armstrong, in press).|
|Primary rock type||slate|
|Secondary rock type||phyllite|
|Other rock types||mica schist; siltstone; limestone|
Metamorphic > Schist > Mica-schist > Biotite-schistPhyllite passes into gray quartz-sericite schist containing abundant porphyroblasts of biotite and garnet in southern Vermont.
Metamorphic > Metasedimentary > Metaclastic > Phyllitedark gray to black quartz-sericite slate or phyllite
Metamorphic > Metasedimentary > Metaclastic > Slatedark gray to black quartz-sericite slate or phyllite; calcareous slate north of Lamoille River
Sedimentary > Carbonate > Limestone (Bed)silty crystalline limestone like that of the Waits River Formation
Sedimentary > Clastic > Siltstone (Bed)
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.
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.
|Geographic coverage||Caledonia - Orange - Orleans - Washington - Windham - Windsor|
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