

THE 



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AMERICAN JOURNAL OF SCIENCE 



[FOURTH SERIES.] 



Art. XI. — An Example of the Possible Intricacy of 

 Glacial Modification of Drainage ivithin a Narrow 

 Area; 1 by Leon Augustus Hausman.. 



The purpose of this paper is to point out that great 

 complexity of modification, and even complete rearrange- 

 ment of drainage courses, may result from a combination 

 of the effects of glacial erosion and glacial deposition 

 within a very restricted area, and in this way to empha- 

 size the possibility of similarly notable changes elsewhere, 

 and to suggest, therefore, the necessity for careful study 

 before an attempt is made to interpret the broader rela- 

 tions of the preglacial drainage in any region occupied 

 by the continental ice sheets. 



Region Under Discussion. 



The region discussed in this paper lies in central New 

 York state, in Tompkins County, latitude 42° 30' N., 

 longitude 76° 20' W., southeast of Lake Cayuga and 

 about ten miles from the city of Ithaca. Abutting on the 

 south of the area lies the village of Slaterville Springs, 

 to which further reference will later be made. The 

 region comprises essentially the headwater drainage 

 area of Sixmile Creek, and includes about twenty-five 

 square miles of territory. (See sketch map, fig. 1.) 



The probable physiographic history of this general 

 central New York area, a portion of the Appalachian 

 Plateau, is in brief as follows : Essentially horizontally 

 bedded sediments, following a notable uplift, had been 



1 In the interpretation of the phenomena in the field, and in the prepara- 

 tion of the manuscript, the author wishes to acknowledge his indebtedness 

 to Dr. O. D. vonEngeln of the Dept. of Geology, Cornell University. 



Am. Jour. Sci. — Fourth Series, Vol. XLV, No. 267. — Makch, 1918. 

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