Mineral Resources On-Line Spatial Data
Mineral Resources > Online Spatial Data > Geology > by state > Vermont
|Name||Missisquoi Formation, Cram Hill Member|
|Original map label||Omcr|
|Comments||Part of Green Mountains Secondary unit description per VT007: The Cram Hill Formation in Windham Co., VT consists of homogeneous, rusty, tan- to dark-gray weathering, pyritiferous, carbonaceous, ilmentite-chlorite-plagioclase-muscovite-quartz schist with distinctive fissile parting along cleavage surfaces. Locally contains 1 to 10 cm thick plagioclase-quartz-muscovite granofels some of which are graded and contain abundant angular and rounded blue-quartz pebbles. Unit is typically cross-cut by mafic dikes and sills of the North River Igneous Suite. Overlies the Moretown Formation. The Cram Hill is of Ordovician age (Ratcliffe, in press).|
|Primary rock type||phyllite|
|Secondary rock type||slate|
|Other rock types||felsic metavolcanic rock; mafic metavolcanic rock|
Metamorphic > Metasedimentary > Metaclastic > Phyllite
Metamorphic > Metasedimentary > Metaclastic > Slate
Metamorphic > Metaigneous > Metavolcanicfelsic to mafic volcanic rocks
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||Orange - Orleans - Washington - Windsor|
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