In a former study of the glacial geology of Connecticut the writer (Flint, 1930)2stated the opinion that the terraces of gravel, sand, silt, and clay, that are conspicuous features of the Connecticut Valley, are of lacustrine origin, deposited in contact with wasting glacier ice. More recently (Flint, 1932), he amended this interpretation, considering the mode of deposition to be dominantly fluvial and the lowest terraces not to be of ice-contact origin. The present paper embodies some of the results of detailed field study undertaken in an attempt to determine more fully the late-glacial and postglacial sequence of events in the Connecticut Valley.
Three classes of deposits, based on mode of origin, are now recognized as constituting the Connecticut Valley terraces in Massachusetts and Connecticut. In the order in which they were made, they are as follows:
Deposits of gravel, sand, and silt, dominantly fluvial . . .