The town of East Hampton was known as Chatham until 1915. It lies within the eastern-central part of the Middletown Pegmatite District and so contains hundreds of pegmatites and dozens of prospects and quarries. Straddling the Bronson Hill island arc terrane and the Merrimack oceanic terrane, the geology consists of mostly metamorphic rocks - gneiss, schist, calc-silicate gneiss, and quartzite of volcanic, plutonic, and sedimentary origin. As a result, the topography is very rugged and parts of the town are heavily forested. The quartzite underlies Great Hill, near the village of Cobalt, where cobalt and nickel were mined along Mine Brook, and microscopic gold occurs in arsenopyrite veins.
Coordinates are for the center of town on Route 196.
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References
- Schooner, Richard. (1958) THE MINERALOGY OF THE PORTLAND-EAST HAMPTON-MIDDLETOWN-HADDAM AREA IN CONNECTICUT (With a few notes on Glastonbury and Marlborough).
- Stugard, Frederick, Jr. (1958) PEGMATITES OF THE MIDDLETOWN AREA, CONNECTICUT. USGS Bulletin 1042-Q.
- Weber, Marcelle H. and Earle C. Sullivan. (November/December 1995) CONNECTICUT MINERAL LOCALITY INDEX. Rocks & Minerals (Connecticut Issue), Volume 70, No. 6, p. 403.
- Cameron, Eugene N. and others. (1954): Pegmatite Investigations 1942-45 New England. U.S. Geological Survey, Professional Paper 255.
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