PRELIMIiSrARY PAPERS. 



11 



enumerated bel(n\' in tlieir chronologic order.' These prehminary reports 

 and discussions hearing more or less directly on this subject have been 

 drawn from in many places dui'ing the preparation of the present work. 



The map given in PI. Ill shows the whole extent of Lake Agassiz, 

 and, for comparison with it, the upper great lakes that outflow by the St. 

 Lawrence. The courses of glacial striai and terminal moraines are also 

 shown, so tar as they have been mapped; but doubtless numerous moraines 

 in Canada remain to be filled in by future exploration. It should be 

 remarked, however, that the northern and noi-theastern boundaries of this 

 glacial lake probably can nexer be exactly determined, and must be laid 

 down in any attempt of this kind by estimation, for they were formed by 

 the receding- ice-sheet instead of a land surface on which beaches would be 

 discoverable. 



United States. 

 Fig. 1.— Ordei 



Manitoba, 

 iif sections m townshiiia. 



Detailed descriptions of tlie lieaches and deltas occupy three chapters 

 and are illustrated by a series of ten map plates (XXIII to XXXII), hav- 



'" Preliminary report on the geology of central and western Minnesota," Geol. and Xat. Hist. 

 Snrvey of Minn., Eighth An. Rep., for 1879, pp. 70-125. 



"Lake Agassiz: a chapter in glacial geology," Bulletin of the Minnesota Academy of Natural 

 Sciences, Vol. II, pp. 290-314, Jan., 1S82; also in Geol. and Nat. Hist. Survey of Minn., Eleventh An. 

 Rep., for 1882, pp. 137-153, with map. 



"The Minnesota A"alley in the Ice age," Proc. A. A. A. S., 1883, Vol. XXXII, pp. 213-231; also in 

 Am. .lour. Sci. (3), Vol. XXVII, pp. 31-42 and 104-111, .Ian. and Feb., 1884. 



Geology of Minne.sota, Final Report, Vol. I, 1884, pp. 408,442,461,484,581,622. 



"The npper beaches and deltas of the glacial Lake Agassiz," Bulletin No. 39, U. S. Geol. Survey, 

 1887, pp. 84, with m.a-p. 



"The recession of the ice-sheet in Minnesota in its relation to the gravel deposits overlying the 

 quartz implements found by Miss Babbitt at Little Falls, Minn.," Proc. Boston Soc. of Nat. Hist., 

 Vol. XXIII, pp. 436-447, Dec, 1887. 



Geology of Minnesota, Final Report, Vol. II, 1888, pp. 134, 500, 504, 517-527. 551, 656, 662, 664-7. 



"Glaciation of mountains in New England and New York," Appalachia, Vol. V, 1889, pp. 

 291-312; also in Am. Geologist, Vol. IV, Sept. and Oct., 1889. 



"Probable causes of glaciation," appendix in Prof. G. F. Wriglit's Ice Age in North America, 

 1889, pp. 573-595. 



"Report of exploration of the Glacial Lake Agassiz iu Manitoba," Geol. and Nat. Hist. Survey 

 of Canada, Annual Report, new series. Vol. IV, for 1888-89, Part E, 1890, pp. 156, with two maps and 



