Cram Hill Formation - phyllite-chip conglomerate and slate conglomerate member (VTOchsb;0)

Cram Hill Formation - phyllite-chip conglomerate and slate conglomerate member

Dark-gray, carbonaceous garnet-pyrite-sericite-chlorite-quartz phyllite with clasts of siltstone, phyllite, quartzite, and dark-gray slate breccia interbedded with Coburn Hill Metabasalt Member (Ochcv). Unit correlative with the St. Daniel Group of Québec. 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-chip conglomerate and slate conglomerate member
Geologic age	Middle? and Early Ordovician
Lithologic constituents	Major Metamorphic > Metasedimentary > Metaclastic > PhylliteDark-gray, carbonaceous garnet-pyrite-sericite-chlorite-quartz phyllite. Minor Metamorphic > Metasedimentary > Metaclastic > SlateClasts of siltstone, phyllite, quartzite, and dark-gray slate breccia. Sedimentary > Clastic > SiltstoneClasts of siltstone, phyllite, quartzite, and dark-gray slate breccia. Metamorphic > Metasedimentary > Metaclastic > QuartziteClasts of siltstone, phyllite, quartzite, and dark-gray slate breccia.
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	NGMDB product page for 96860
Counties	Orleans

Cram Hill Formation - phyllite-chip conglomerate and slate conglomerate member

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.