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Cram Hill Formation - phyllite member
Gray to silvery-green, sericite-chlorite-quartz phyllite with thin beds of rusty-weathering, pearly-white, fine-grained granofels. Interlayered with Ochuc and Ochsb at the contacts. Mapped locally in the Albany area. Part of the Cram Hill Formation of the Newport Center area. Part of the metasedimentary host rocks of the North River Igneous Suite. Rocks of the Early to Late Taconic Accreted Terrane of the Rowe-Hawley Zone. Eastern allochthonous sequence, oceanic and accretionary realm, ultramafic inclusions, volcanic-arc intrusives, and volcanic rocks.
State |
Vermont |
Name |
Cram Hill Formation - phyllite member |
Geologic age |
Middle? and Early Ordovician |
Lithologic constituents |
Major
Metamorphic > Metasedimentary > Metaclastic > PhylliteGray to silvery-green, sericite-chlorite-quartz phyllite.
Minor
Metamorphic > Granoblastic > GranofelsThin beds of rusty-weathering, pearly-white, fine-grained granofels.
|
References |
Ratcliffe, N.M., Stanley, R.S., Gale., M.H., Thompson, P.J., and Walsh, G.J., 2011, Bedrock geologic map of Vermont: U.S. Geological Survey Scientific Investigations Map 3184, 3 sheets, scale 1:100,000.
https://pubs.er.usgs.gov/publication/sim3184 |
NGMDB product |
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Counties |
Lamoille - Orleans
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