Cram Hill Formation - phyllite and quartzite member

Light-gray to tan, rusty-weathering, fine- grained quartz-sericite-chlorite-albite phyllite, quartzite, and flinty sulfidic granofels; thin layers of felsite, conglomerate, and breccia occur in the vicinity of Coburn Hill. Paper schist fabric occurs locally on the west side of Coburn Hill. 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 and quartzite member
Geologic age Middle? and Early Ordovician
Lithologic constituents
Major
Metamorphic > Granoblastic > GranofelsFlinty sulfidic granofels.
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Metamorphic > Metasedimentary > Metaclastic > PhylliteLight-gray to tan, rusty-weathering, fine- grained quartz-sericite-chlorite-albite phyllite.
Incidental
Sedimentary > Clastic > ConglomerateThin layers of felsite, conglomerate, and breccia occur in the vicinity of Coburn Hill.
Sedimentary > Clastic > Sedimentary-brecciaThin layers of felsite, conglomerate, and breccia occur in the vicinity of Coburn Hill.
Igneous > Volcanic > Felsic-volcanicThin layers of felsite, conglomerate, and breccia occur in the vicinity of Coburn Hill.
References
NGMDB product
Counties Orleans