Madrid and Smalls Falls Formations, undivided

Madrid and Smalls Falls Formations, undivided.
State New Hampshire
Name Madrid and Smalls Falls Formations, undivided
Geologic age Silurian
Lithologic constituents
Major
Metamorphic > Schist > Pelitic-schistdark pelitic-sulfidic schist, sulfidic-graphitic schist
Metamorphic > Granoblastic > Granofelsmassive to weakly foliated, purple biotite-feldspar granofels, pyrrhotitic calc-silicate granofels
Minor
Metamorphic > Metasedimentary > Calc-silicate-rocklayered calc-silicate, dark pelitic-sulfidic schist containing calc-silicate pods in upper member
Comments Part of the Central Maine Composite Terrane (Central Maine Trough) - Variably metamorphosed sedimentary and volcanic rocks of greenschist to granulite facies, locally migmatized. Area includes structural belts between the Monroe fault on the west and the Campbell Hill fault on the east; that is, the Bronson Hill anticlinorium, Piedmont allochthon, Kearsarge-central Maine synclinorium, central New Hampshire anticlinorium, and Rochester-Lebanon (Maine) antiformal synclinorium.
References
NGMDB product
Counties Carroll - Cheshire - Coos