Abstract
A non-fossiliferous, concretionary plastic clay found submerged under 300 feet of water in Block Island Sound, 3 miles south of Fishers Island, is believed to be a remnant of the Pleistocene freshwater lake deposits postulated by earlier investigators to have formed when sea level was lower. The occurrence of this material in Block Island Sound requires a re-examination of the clay deposits on Fishers Island and the propinquitous landmasses which have been placed in the older Gardiners Formation mainly on the basis of their inferred stratigraphic position.
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