The terraces of the lower Connecticut Valley have been a subject of intermittent study ever since Dana began to investigate them, at some time before 1867, and their association with glacial retreat has been recognized since 1898, but no account of their bearing on the late Pleistocene history of Connecticut has been published. Detailed field‐work during the past year has made possible the interpretation of them here presented. In this work the surficial deposits in the Connecticut portion of the valley have been accurately mapped. The Massachusetts portion has been visited only in reconnaissance.

I am greatly indebted to Messrs. Grant T. Wickwire and Wilbur G. Foye, who carried on detailed mapping simultaneously with my work and furnished valuable data on parts of the New Haven, Meriden, and Middletown quadrangles. My thanks are due also to Dr. Ernst Antevs, who kindly examined the results of the work and offered . . .

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