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THE JOURNAL OF GEOLOGY.

rivers emptied into this estuary? When should we expect to find terraces on either side of a sand-plain, as at Pawtucket, R. I.? Why are not sand-plains of more frequent occurrence throughout the area covered by the ice-sheet? These and many other questions are suggested as we study the details of the ice's work. Their answers away the future study and research of those local observers, who will make themselves familiar with the geographic forms of their own regions.

F. P. Gulliver.

REFERENCES.

  • Davis, William M.—Structure and Origin of Glacial Sand-plains.Bull. Geol. Soc. of Am., Vol. I., pp. 195-202.
  • Davis, William M.—Subglacial Origin of Eskers.Proc. Boston Soc. of Nat. Hist., Vol. XXV., 1892, pp. 477-499.
  • Russell, I. C.—An Expedition to Mount St. Elias, Alaska.Nat. Geog. Mag., Vol. III., pp. 53-204.
  • Russell, I. C.—Malaspina Glacier.Journal of Geology, Vol. I., No. 3, pp. 219-245.
  • Chamberlin, T. C.—Hillocks of Angular Gravel and Disturbed stratification.Amer. Jour. of Sci., Vol. XXVII., 1884, pp. 378-390. Contains References.
  • Chamberlin, T. C.—The Horizon of Drumlin, Osar and Kame Formation.Jour. of Geol., Vol. I., No. 3, pp. 255-267.
  • Wright, G. F.—The Ice Age in North America.
  • Upham, Warren.—Upper Beaches and Deltas of Glacial Lake Agassiz.Bull. 39, U. S. Geol. Surv.
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