[1483] An Inventory of our Glacial Drift, by T. C. Chamberlin in the Proceedings of American Association for Advancement of Science, vol. xxxv. p. 196. A general map of this great moraine and others representing portions of it on a large scale will be found in his “Preliminary Paper on the terminal moraine of the second glacial period,” in the Third Annual Report of the U. S. Geological Survey, by J. W. Powell (Washington, 1883).
[1484] Chamberlin, Proc. Amer. Assoc., ubi sup., p. 199.
[1485] The place of Niagara Falls in geological history, by G. K. Gilbert, of the U. S. Govt. Surv., in the Proc. Amer. Assoc., Ibid. p. 223; Geology of Minnesota [final report], by N. H. Winchell and Warren Upham, vol. i. p. 337 (St. Paul, 1888).
[1486] The American Naturalist, vol. vii. p. 204.
[1487] Ibid. vol. x. p. 329.
[1488] Tenth Annual Report of the Trustees of the Peabody Museum of American Archæology and Ethnology, vol. ii. p. 30.
[1489] Second report on the palæolithic implements from the glacial drift, in the valley of the Delaware River, near Trenton, New Jersey, Ibid. p. 225.
[1490] A complete account of Dr. Abbott’s investigations will be found in his Primitive Industry, chap. 32 (Palæolithic Implements); Tenth ann. rep. of Peabody Museum, vol. ii. p. 30; Eleventh Do., Ibid. p. 225; Proceedings of Boston Society of Natural History, vol. xxi. p. 124; vol. xxiii. p. 424; Proc. of Amer. Assoc. for Adv. of Science, vol. xxxvii.
[1491] Proceedings of Boston Society of Natural History, vol. xxi. p. 148.
[1492] Twelfth annual report of Peabody Museum, vol. ii. p. 489.