REPORT OF THE DIRECTOR I915 165 



ANCIENT WATER LEVELS OF THE CROWN POINT 

 EMBAYMENT 



BY ELMER EUGENE BARKER 

 I INTRODUCTORY STATEMENT 



The observations recounted in this paper are offered in the hope 

 that the attention of geographers and geologists may be attracted to 

 a locality whose postglacial physiography is of great interest in con- 

 nectipn with any critical study of the general glaciation of the 

 Champlain region. 



The writer has mapped and attempted to describe and interpret 

 in some detail a part of the phenomena of this locality. He has used 

 local place names where necessary to insure exact identification to 

 possible future investigators in this field. It is his purpose here to 

 show that the evidence they furnish falls in line with the phenomena 

 observed by other investigators in this region, and tends to sub- 

 stantiate their theories concerning its postglacial history. 



In making these observations a field map was used. It was 

 enlarged from the United States Geological Survey map of the 

 Ticonderoga quadrangle. On this map were then charted the 

 various moraines, beach terraces, shore lines, wave-beaten clitls, 

 and the like, as they were found. These were then correlated along 

 their proper lines and compared with the theoretical expectation as 

 to the altitudes and places where such phenomena should be found. 



Many observations were made with an aneroid barometer, but it 

 was found to vary so from day to day and to be so inaccurate that 

 data taken with it were discarded wherever those on the United 

 States Geological Survey map could be used. 



The theoretical expectancies for the locality here studied were 

 calculated on the basis of Prof. J. B. Woodworth's postulated 

 altitudes of the postglacial Champlain water bodies ^ (Woodworth 



1905)- 



2 PREVIOUS WORK IN THIS REGION 



Among the first men to study the postglacial physiography of this 

 region were S. P. Baldwin ^ (1894), G. K. Gilbert^ (1896, p. 59) 

 and C. E. Peet* (1904). Of these, Peet studied particularly the 



1 'Citations in parentheses refer to bibliography at end of paper. 



2 Baldwin, S. P. Pleistocene History of the Champlain Valley. Am. 

 Geol., i'3 : 1 70-84. 1894. 



3 Gilbert, G. K. U. S. Geol. Survey, 18th Ann. Rep't, i -.59. 



* Peet, C. E. Glacial and Post-glacial History of the Hudson and Cham- 

 plain Valleys. Jour, of Geol., 12:415-661. 1904. 



