456 The Ohio Naturalist. [Vol. IX, No. 4, 



studied. The Powell moraine is the largest and was described 

 in detail by Leverett several years ago. The kames are well 

 illustrated by Spangler's hill now the site of the Hartman farms, 

 by Baker's hill just south of Columbus and by a group of hills 

 north of Canal Winchester; and the eskers are illustrated by a 

 fine example over two miles long crossing the National Pike at 

 Hibernia, and by another a mile or more south-east of Canal 

 Winchester. 



Post-glacial dissection of these glacial features, especially the 

 till plain, has given rise to the four large north-south valleys 

 and the multitude of short, steep-sided gorges. 



These gorges and many well records have revealed much con- 

 cerning the rock surface beneath the drift. This part of the 

 study is yet incomplete but it has proceeded far enough to deter- 

 mine that there is very little agreement between the present 

 topography and that of the rock below. The latter has broad ele- 

 vations and broader shallow depressions which are probably 

 portions of very mature divides and valleys. Because of their 

 great maturity it seems that these features must have developed 

 preglacially. The rock surface also has many narrow, steep- 

 sided valleys now drift filled. No system has yet been worked 

 out to which these valle3^s can be referred but they were undoubt- 

 edly due to erosion in interglacial periods, and there may be 

 as many systems of these valleys, now filled and buried, as there 

 have been interglacial periods. 



The field work in this area will be continued, and the bulletin 

 containing the completed report published as soon as possible. 



Prof. Griggs moved that a committee be appointed to con- 

 sider a new night for the meetings of the club. The motion 

 was unanimously carried after which the club adjourned. 



Arthur H. McCray, Secretary. 



CORRECTION. 



In the paper entitled "Rock Terraces Along the Streams 

 near Columbus, Ohio," in the December, 1908, Ohio Naturalist, 

 p. .398, the sentence beginning on line 1 should read: "The rocks 

 along the Scioto and Olentangy rivers is all of Devonian age ; two 

 rather resistant limestones — the Columbus and Delaware — and 

 two much less resistant shales above — the Olentangy and Ohio. 

 Along the Big Darby the Columljus shows, and also below it the 

 equally resistant Monroe limestone of Silurian age." 



Date of Publication, February 16, 190Q. 



