Cram Hill Formation - amphibolite and greenstone member

Light-greenish-gray, feldspathic chlorite-actinolite greenstone and bedded andesitic to basaltic tuff and amphibolite, associated with ironstone, coticule, and minor pods of 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 - amphibolite and greenstone member
Geologic age Middle? and Early Ordovician
Lithologic constituents
Major
Metamorphic > Metaigneous > GreenstoneLight-greenish-gray, feldspathic chlorite-actinolite greenstone.
Igneous > Volcanic > Mafic-volcanic (Pyroclastic-tuff)Bedded andesitic to basaltic tuff and amphibolite.
Metamorphic > AmphiboliteBedded andesitic to basaltic tuff and amphibolite.
Minor
Sedimentary > Chemical > Banded-iron-formationAssociated with ironstone, coticule.
Sedimentary > Carbonate > Dolostone (Lens)Minor pods of dolostone.
References
NGMDB product
Counties Windham - Windsor