350 



EARTH FEATURES AND THEIR MEANING 



Upon the opposite or northeastern shore of the lake, on the 

 other hand, the land is everywhere rising out of the water, and 

 the waves are now building storm beaches well out upon the wave- 

 cut terrace. Here the streams, instead of forming estuaries by 



drowning, drop down 

 in rapids to the level 

 of the lake. 



At the southwest- 

 ern margin of Lake 

 Erie there is every- 

 where evidence of a 

 rapid encroachment 

 by the water. In the 

 caves of South Bass 

 Island stalactites, 

 which must obviously 

 have formed above 

 the lake level, 



FIG. 376. Portion of the Inner Sandusky Bay, to 

 afford a comparison of the shore line of 1820 with 

 that of to-day (after Moseley). 



are 



now permanently sub- 

 merged. It is, however, about Sandusky Bay upon the south- 

 west shore that the most striking observations have been made. 

 Moseley has collected historical records of the killing of forest 

 trees through a submergence which was the result of an advance 

 of the water upon the shores. It seems to be proven from his 

 studies that the water is now rising in Sandusky Bay at a rate of 

 about 2.14 feet per century. In Fig. 376 there is a comparison 

 of the shores of the inner bay separated by an interval of about 

 ninety years. 



READING REFERENCES FOR CHAPTER XXIV 

 Uptilt in basin of Lake Agassiz : 



WARREN UPHAM. The Glacial Lake Agassiz, Mon. 25, U. S. Geol. Surv., 

 pp. 474^522. 



Uptilt in Laurentian Basin : 

 G. K. GILBERT. Recent Earth Movement in the Great Lakes Region, 



18th Ann. Rept. U. S. Geol. Surv., 1898, Pt. ii, pp. 595-647. 

 J. W. SPENCER. Deformation of the Algonquin Beach, etc., Am. Jour. 



Sci. (3), vol. 41, 1891, pp. 14-16. 

 F. B. TAYLOR. The Highest Old Shore Line of Mackinac Island, Am. 



Jour. Sci. (3), vol. 43, 1892, pp. 210-218. 



