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Town of Ridgefield, Fairfield Co., Connecticut, USA
Fillow Quarry, Branchville, Town of Ridgefield, Fairfield Co., Connecticut, USA
Photo: 2009 David S. Bernstein
Photo: 2009 David S. Bernstein
Latitude: 41°16'53"N
Longitude: 73°29'55"W
Longitude: 73°29'55"W
Ridgefield has very complicated bedrock geology. Cameron's Line, a major thrust fault separating Laurentian Terrane metamorphic rocks from overthrust Connecticut Valley Terrane metamophic rocks, winds its way generally NE-SW through the lower third of town. The rocks south of the Cameron's Line are mostly Ordovician unnamed felsic orthogneiss with some of the Harrison Gneiss metadiorite in the Branchville area. North of Cameron's Line, higher elevations with rugged topography along the eastern, northern and western part of town (such as under Pine, Ned, and West Mountains), are underlain by Grenville age Laurentian gneiss bedrock. Irregular, elongated valleys with numerous lakes and swamps in the center of town are underlain by easily eroded Cambrian to Ordovician Walloomsac and Stockbridge Marbles. A overthrusted Taconic slice of Cambrian Manhattan Schist metasedimentary rock winds its way between these valleys underlying ground with intermediate elevations such as under Ridgebury and Barrow Mountains and north and east of Wataba and Fox Hill Lakes.
Mineral List
Mineral list contains entries from the region specified including sub-localities146 entries listed. 82 valid minerals. 9 type localities (valid minerals). 1 erroneous literature entry.
Localities in this Region
USA
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References
Manchester, J.G. (1931): The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, p. 89.
Januzzi, Ronald E. (1976): Mineral Localities of Connecticut and Southeastern New York State. The Mineralogical Press, Danbury.
Januzzi, Ronald E. (1976): Mineral Localities of Connecticut and Southeastern New York State. The Mineralogical Press, Danbury.
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