THE CONTINENTAL GLACIERS OF THE "ICE AGE'.' 319 



Drif tless and drift areas : 

 T. C. CHAMBERLIN and R. D. SALISBURY. Preliminary Paper on the 



Drif tless Areas of the Upper Mississippi Valley, 6th Ann. Rept. U. S. 



Geol. Surv., 1885, pp. 199-322, pis. 23-29. 

 R. D. SALISBURY. The Drift, its Characteristics and Relationships, 



Jour. Geol., vol. 2, 1894, pp. 708-724, 837-851. 

 R. H. WHITBECK. Contrasts between the Glaciated and the Driftless 



Portions of Wisconsin, Bull. Geogr. Soc., Philadelphia, vol. 9, 1911, 



pp. 114-123. 



Glacier gravings : 



T. C. CHAMBERLIN. The Rock Scorings of the Great Ice Invasions, 7th 

 Ann. Rept. U. S. Geol. Surv., 1888, pp. 147-248, pi. 8. 



The dispersion of the drift : 

 R. D. SALISBURY. Notes on the Dispersion of Drift Copper, Trans. Wis. 



Acad. ScL, etc., vol. 6, 1886, pp. 42-50, pi. 

 N. S. SHALER. The Conditions of Erosion beneath Deep Glaciers, 



based upon a Study of the Bowlder Train from Iron Hill, Cumberland, 



Rhode Island, Bull. Mus. Comp. Zool. Harv. Coll., vol. 16, No. 11, 



1893, pp. 185-225, pis. 1^ and map. 

 WILLIAM H. HOBBS. The Diamond Field of the Great Lakes, Jour. 



Geol., vol. 7, 1899, pp. 375-388, pis. 2 (also Rept. Smithson. Inst., 



1901, pp. 359-366, pis. 1-3). 



Glacial features : 

 T. C. CHAMBERLIN. Preliminary Paper on the Terminal Moraine of the 



Second Glacial Epoch, 3d Ann. Rept. U. S. Geol. Surv., 1883, pp. 



291-402, pis. 26-35. 

 G. H. STONE. Glacial Gravels of Maine and their Assbciated Deposits, 



Mon. 34, U. S. Geol. Surv., 1899, pp. 489, pis. 52. 

 W. C. ALDEN. The Delaven Lobe of the Lake Michigan Glacier of the 



Wisconsin Stage of Glaciation and Associated Phenomena. Prof. Pap. 



No. 34, U. S. Geol. Surv., 1904, pp. 106, pis. 15 ; The Drumlins of 



Southeastern Wisconsin, Bull. 273, U. S. Geol. Surv., 1905, pp. 46, 



pis. 9. 

 W. M. DAVIS. Structure and Origin of Glacial Sand Plains, Bull. Geol. 



Soc. Am., vol. 1, 1890, pp. 196-202, pi. 3; The Subglacial Origin 



of Certain Eskers, Proc. Bost. Soc. Nat. Hist., vol. 35, 1892, pp. 477- 



499. 

 F. P. GULLIVER. The Newtonville Sand Plain, Jour. Geol., vol. 1, 1893, 



pp. 803-812. 



