OUTLINE OF PREVIOUS PUBLICATIONS. 27 



than marine or lacustrine.^ He called attention also to the fact that the 

 termination of the drift is on a southward- sloping country and that its dis- 

 tribution is consistent only with the glacial hypothesis. 



The drift and draix:iage features were given only incidental notice in 

 the first geological surveys of Ohio and Pennsylvania, and but limited 

 attention by the New York survey. The second geological survey of 

 Ohio, organized in 1869 under Newberry, has given, in the reports for 

 each county, a brief discussion of these features. In addition to this, New- 

 berry presented, in Volume II of the Geology of Ohio, a special discussion 

 of surface geology, covering about 80 pages, in which the principal facts 

 scattered through Volumes I and II are brought together and interpreted. 

 The data collected by that survey are discussed in some detail in the body 

 of this report in connection with those collected subsequently by tlie writer 

 and others. 



The second geological survey of Pennsylvania, under the direction of 

 Lesley, collected in the decade beginning in 1875 many facts bearing on 

 the drift and drainage features of northwestern Pennsylvania. These 

 appear in connection with the study of the underlying rock formations in 

 Reports I", I^, and I^, prepared by Carll; in K, KK, and KKK, by 

 Stevenson; in Q, QQ, Q'', and Q^, by White; and in VV, by Chance. In 

 addition to these, a special study of the glacial, boundary in Pennsylvania 

 and southwestern New York was made in 1882 by Lewis, witli the assist- 

 ance of Gr. F. Wright, which forms Report Z of the Pennsylvania survey. 

 The data thus collected are more carefully noted in the body of this report. 



The mapping of the glacial boundary was continued by Wright across 

 Ohio and northern Kentucky under the auspices of the Western Reserve 

 Historical Society of Cleveland, Ohio, and across Indiana and Illinois under 

 the present Survey. The results of the former study appeared in a bulletin 

 of the society, while the main results of the entire study are presented in 

 Bulletin 58 of this Survey. Wright has also incorporated this material in 

 his Ice Age in North America, while special topics connected witli these and 

 other studies have been discussed by him in various scientific journals. The 

 mapping by Wi'ight is found to apply in northwestern Pennsylvania and 

 eastern and central Ohio chiefly to the border of the Wisconsin drift, but in 

 southwestern Oluo and districts farther west it indicates the approximate 



iProc. Am. Assoc. Adv. Sci., Vol. XIII, 1860, pp. 319-321. 



