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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...
Seismotectonic map of the Eastern United States
Jarvis B. Hadley, James F. Devine
1974, Miscellaneous Field Studies Map 620
The purpose of a seismotectonic map is to describe the distribution of historic seismic activity in relation to geologic structures and tectonic provinces and to identify structures or regions that are characterized by consistent relations between seismic activity and structural features. An experimental study to test the feasibility of preparing...
Map showing unconsolidated materials, Southwick quadrangle, Massachusetts-Connecticut
Robert W. Schnabel
1974, Miscellaneous Field Studies Map 606-A
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...