In 1903, 1904, and 1905, the writer and his associates made a detailed study of Long Island, New York, the results of which were published by the United States Geological Survey in 1914.1 In this report, four glacial periods, the Nebraskan (Sub-Aftonian), the Kansan, the Ulinoian, and the Wisconsin, were recognized, with three interglacial stages correlated with the Aftonian, the Yarmouth, and the Sangamon (Vineyard).

For more than 30 years, since the completion of the field work and the preliminary publication of results, the sequence set forth has not been seriously challenged, but in a paper by MacClintock and Richards,2 published in the March issue of the Bulletin, important changes in the classification and correlation of the deposits have been proposed.

The points of difference emphasized are as follows:

  1. Glacial control of marine levels.

  2. Changes in correlation of Long Island and New Jersey deposits.

  3. Exclusion of the Mannetto . . .

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