28 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



border of the older drift. In portions of central Ohio and northwestern 

 Pennsylvania the older drift extends several miles beyond the limits of the 

 Wisconsin, and thus invalidates the use of the term glacial boundary for 

 portions of the line traced by Lewis and Wright, since it was not on the 

 boundary. The name terminal moraine, however, is more pertinent to this 

 portion, since it is the Wisconsin terminal moraine. 



Within the portion of Indiana under discussion much attention has been 

 given by the Indiana geological survey to the drift of the northeastern 

 counties, which are reported upon by Dryer, and to a few counties in the 

 eastern and southeastern portions, reported upon by Phinney, McCaslin, 

 Elrod, Warder, and Borden. The reports of Diyer and Phinney have given 

 due attention to moraines and other drift forms, and are notably in harmony 

 with present methods of classification. Each of the other reports also contains 

 valuable data. 



The preliminary report by Ghamberlin, referred to above, deals chiefly 

 with a strong morainic system which he traced from Wisconsin southeast- 

 ward into Indiana and thence eastward into New York, and found to be dis- 

 posed in loops around the western and southern ends of the great basins of 

 the region. In this and subsequent papers Ghamberlin has sought to dis- 

 criminate between drift sheets of different ages and to determine the several 

 stages of the Glacial epoch. 



Aside from the reports and papers already mentioned there are several 

 papers by Chambei'lin, Claypole, Dryer, Fairchild, Foshay, Hice, Spencer, 

 Taylor, Tight, Upham, White, Wright, and others, which throw light on the 

 glacial history of this region, as shown in the course of the discussion. For 

 titles and places of publication of these and other papers bearing upon the 

 region the subjoined list may be consulted: 



BIBLIOGRAPHY. 



(Brought down to the close of the year 1899.) 



Andrews, E. B. Relation of the river terraces of southern Ohio to the drift and 

 drift theories: Proc. Am. Assoc. Adv. Sci., Vol. XIII, 1860, pp. 319-321. 



General features and drift of the second district: Rept. Geol. Survej^ Ohio, 



1869, pp. 57-64. 



Bowlders and surface drift of the second district: Rept. Geol. Survey 



Ohio, 1870, pp. 57-58. 

 — On a peat bed under drift in Ohio: Am. Naturalist, Vol. V, 1871, p. 523. 



