8 12 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 await 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 stratifica- 

 tion. 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. 



