Fitch Formation (Upper Silurian; Pridolian and Ludlovian)

Metamorphosed limestone, calcareous sandstone, siltstone, and dark pelitic schist; lower contact is disconformable on the Clough Quartzite. Fossiliferous.
State New Hampshire
Name Fitch Formation (Upper Silurian; Pridolian and Ludlovian)
Geologic age Upper Silurian - (Pridolian and Ludlovian)
Lithologic constituents
Metamorphic > Metasedimentary > Metacarbonate > Marblemetamorphosed limestone
Metamorphic > Metasedimentary > Metaclastic > Metasiltstonesmetamorphosed siltstone
Metamorphic > Metasedimentary > Metaclastic > Metasandstonemetamorphosed calcereous sandstone
Metamorphic > Schist > Pelitic-schistdark pelitic schist
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.
NGMDB product
Counties Cheshire - Grafton - Merrimack - Sullivan