G. D. Hubbard — Finger Lake Bed in Ohio. 449 



latitude of Reedsburg ; 998-1000 feet on the road crossing the 

 valley about half way between Reedsburg and Blachleyville ; 

 973 at the Craigton road and 960 where the Lorain, Ashland, 

 and Southern railroad crosses the wagon road one-eighth mile 

 north of Custaloga. Little wave-cut cliffs in the hills of this 

 southern boundary together with beach phenomena make the 

 determination here rather certain. No wave work could be 

 located in the vicinity above the 960 foot level but there was 



Fig. 2. 



A B C D E 



A, Pleasant Home. B, 1% miles N.W. of Reedsburg. C, Near Bench 

 Mark, 1*2 miles N. of Blachleyville. D, Near Craigton. E, Near Cus- 

 taloga. 



Fig. 2. Section along an approximately north-and-south line following 

 shoreline features of main body and eastern arm of Craigton Lake, O. 



plenty below. This point is as certain as that there was wave 

 work and delta building recorded at levels above 1040 at the 

 north end. Allowing five or six feet for fan deposits or outwash 

 on top of the delta at the north end, we still have an altitude of 

 1035 here or 75 feet above the shore features at the southern 

 end. This means a tilting upward relatively at the north with 

 reference to the southern end of 75 feet in between 18 and ] 9 

 miles, or 4 feet to the mile. See section. 



Interpretations and Correlations. 



The post-glacial tilting of the shorelines of the precursors of 

 our Great Lakes has long been recognized. Very little evi- 

 dence has been found of tilting south of the borders of our 

 present lakes. The long east- and-w est abandoned beaches 

 across Ohio show almost no tilting, but lines running more 

 nearly north and south are appreciably displaced. The evi- 

 dence presented above carries actual tilting 50 miles south of 

 the most southern part of Lake Erie, itself the most southern 

 lake. Furthermore the rate of tilting is greater in this case 

 than that observed on many of the abandoned beaches farther 

 north. 



Goldthwait,* who has worked extensively on abandoned 

 beaches to establish the amount and kind of warping that may 



*J. W. Goldthwait, Geol. Soc. Am., Bull. vol. xxi, pp. 227-248, 1910. 



