AMERICAN JOURNAL OF SCIENCE 



[FIFTH SERIES.] 



Abt. XIX. — Minor Faulting in the Cayuga Lake Region;* 

 by E. Tatttm Long. 



Introduction. 



The drought of the summer of 1921 caused many of the 

 creeks in the vicinity of Cayuga Lake to run almost or 

 entirely dry. Advantage of this condition was taken to 

 make a rather detailed study of rock exposed in their beds 

 and on their banks, with a view to adding if possible some 

 information as to the nature of the numerous small faults 

 of the region, and in particular to a very unusual mani- 

 festation of faulting shown on a small scale in Salmon 

 Cr. at Ludlowville, N. Y. (See map, fig. 1.) For some- 

 time these faults had caused considerable speculation but 

 weather conditions made field investigation impossible. 



As it soon became evident that knowledge of the general 

 structure of the region would give little clue to the par- 

 ticular features here exposed, the beds of some thirty odd 

 creeks covering a distance about 20 miles to the north of 

 Ludlowville and 4 miles to the south, were traversed, in 

 addition to the whole of the east shore of Cayuga Lake, 

 except the lower nine miles. The Lehigh Valley Railway 

 tracks for this same distance and about six continuous 

 miles of the west shore above Taughannock, with a few 

 additional shorter stretches to the north, were also cov- 

 ered on foot so that all details could be closely observed 

 and contact readings made of the dip of the strata. A 

 launch was employed in order that sight readings could be 

 made on both shores, a distance of about 30 miles being cov- 

 ered in this way. These readings proved more accurate 

 and more representative, as several feet instead of inches 

 could in this way be covered by the clinometer of a Brun- 



* Grateful acknowledgment is herewith given Prof. A. J. Eames and 

 Prof. V. E. Monnett for helpful criticism of the manuscript. 



Am. Jour. Sci.— Fifth Series, Vol. Ill, No. 16.— April, 1922. 



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