﻿6 NEW YORK STATE MUSEUM 



Professor Fairchild spent the season of 1908 and portions of 

 two previous seasons in the study of the Pleistocene geology of 

 the area, and his reports will be found included in their appro- 

 priate places. 



During both the seasons of 1907 and 1908 Dr E. O. Ulrich of 

 the United States Geological Survey was in the field for a time 

 with Dr Ruedemann and myself. In 1908 Dr H. IV1. Ami of the 

 Geological Survey of Canada was also present and we spent 10 

 days together, chiefly in study of the Pamelia, Lowville and Black 

 River limestones, with a short excursion to the district around 

 Kingston, under Dr Ami's guidance. Combined work of this sort 

 is of the utmost value, and as a result of it the indirect contribu- 

 tion of both these gentlemen to this report is most important and 

 is gratefully acknowledged. 



In a previous year Professor Smyth had reported upon the 

 larger part of the district comprised in the Alexandria and Grind- 

 stone sheets, as well as their eastward extension, doing the work 

 as accurately as the imperfect base map at his disposal war- 

 ranted. It is a pleasure to testify to the importance and ac- 

 curacy of this report, especially in view of the date at which, 

 and the circumstances under which the work was done. 1 The 

 different rock groups and their relations to one another were 

 thoroughly worked out, and the independent mapping here re- 

 ported upon has done little more than to repeat his work and 

 emphasize its correctness. This of itself would justify his ap- 

 pearance as a collaborator in this report, independently of his 

 direct contribution. 



For five weeks of the season of 1908 Dr H. N. Eaton of Chapel 

 Hill, N. C, served as voluntary assistant. This generously given 

 help is gladly acknowledged, and the report also bears witness to 

 the service of his camera. 



LOCATION AND CHARACTER 2 

 These five quadrangles constitute the extreme northwestern 

 portion of northern New York, bordering the lower end of Lake 

 Ontario and the St Lawrence river in the Thousand Islands 

 region. The area mapped extends from the meridian of 75 ° 45' w. 

 longitude to Lake Ontario and from latitude 44 to the national 

 boundary. It comprises some 560 square miles. 



1 Geology of the Crystalline Rocks near the St Lawrence River. N. Y 

 State Geol. 19th An. Rep't 1899. p.r85~i04. 



2 By H. P. Cushing. 



