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Map showing thickness of principal clay unit, Hartford South Quadrangle, Connecticut Map showing thickness of principal clay unit, Hartford South Quadrangle, Connecticut
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 upper layers of the clay unit commonly grade into a layer of silt and very fine sand. Small, isolated clay
Map showing unconsolidated materials, Southwick quadrangle, Massachusetts-Connecticut Map showing unconsolidated materials, Southwick quadrangle, Massachusetts-Connecticut
This map is intended to serve as an aid in reconnaissance evaluation of unconsolidated materials and can be used to identify areas of potential interest. The units on this map indicate the first material of substantial thickness (generally greater than 3 feet (1 m) encountered beneath the soil layer. The soil layer (commonly a foot or two (about 0.5 m) thick) is not mapped. Other...