Cram Hill Formation - ironstone, quartzite, and coticule member

Dark-gray- to sooty-black-weathering siliceous ironstone, magnetite quartzite, garnet quartzite, rusty-weathering amphibolite, coticule, and pods of orangey-gray to pinkish-gray-weathering dolostone. Part of the metasedimentary host rocks of the North River Igneous Suite. Cram Hill Formation: western part of the Cram Hill Formation is in part correlative with Whetstone Hill Member of the Moretown Formation. 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 - ironstone, quartzite, and coticule member
Geologic age Middle? and Early Ordovician
Lithologic constituents
Major
Metamorphic > AmphiboliteRusty-weathering amphibolite, coticule.
Metamorphic > Metasedimentary > Metaclastic > QuartziteMagnetite quartzite, garnet quartzite.
Sedimentary > Chemical > Banded-iron-formationDark-gray- to sooty-black-weathering siliceous ironstone.
Minor
Sedimentary > Carbonate > Dolostone (Lens)Pods of orangey-gray to pinkish-gray-weathering dolostone.
References
NGMDB product
Counties Orange - Washington - Windham - Windsor