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Map showing thickness of principal clay unit, Hartford South Quadrangle, Connecticut
William H. Langer
1974, Miscellaneous Field Studies Map 487-B
This map show the distribution and thickness of the principal clay unit.  The clay unit consists of a thick, massive bed of relatively pure clay in some areas; in other areas it consists of discrete layers of clay alternating with layers of silt and very fine sand (varved clay).  The...