PROCEEDINGS OF THE ROCHESTER ACADEMY OF SCIENCE 



VOL. 5, PP. 161-240, PLATES 11-16. JUNE, 1918. 



ESKERS IN THE VICINITY OF ROCHESTER, NEW YORK 

 By Albert W. Giles 



Presented for publication and read by title before the Academy, 



January 14, 1918 



COXTENTS 



Introduction, ... 



Definition, 



Popular names of eskers, . 

 Technical nomenclature. 

 History, 

 Occurrence of eskers, . 



deneral occurrence. 



Occurrence in the New Y 

 General Description, 

 Dimensions, 



Segmentation and intervals. 

 Tributaries, 

 Direction, 



Relations at the point of origin. 

 Character of course, 

 Relations to surroundings. 

 Relations to termination, . 

 Association with luoraines. 

 Composition, 

 Source of materials. 

 Stratification, 



Slopes, .... 

 Surface characters. 

 Relation to rock surface beneath. 

 Time of formation. 



Condition of the ice at the time of 

 Rate of growth. 

 Theories of origin, 



Subglacial hypothesis. 



Statement, 



.\rgument, . 



Objections, 



Conclusion, 

 Superglacial hypothesis. 



Statement, . 



Argument, 



Objections, . 



Conclusion, 

 Hypothesis of origin at the ed 



Statement, 



Objections, . 



Conclusion, 

 Englacial hypothesis. 

 Ice canyon hypothesis, 



.Statement, . 



Objections, 



Conclusion, . 

 Other views, 

 Testimony of existing glaciers. 

 General conclusion regarding origin. 



ork area. 



formation. 



f the ice. 



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