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
NGMDB product
Counties Orleans