CHAPTEEX. 



THE EAELY WISCONSIN DRIFT. 



GENERAL STATEMENT. 



In the Wisconsin stage of glaciation there were several glacial lobes 

 occupying the basins now covered by the Great Lakes and extending 

 beyond tliem into the lowlands that are connected with the southern borders 

 of the lake basins. These lobes were brought to notice and named by 

 Chamberlin.-' Those included in the region under discussion are the Miami, 

 Scioto, and Grand River lobes, named from the drainage basins in which 

 they were situated, and their successor, the Maumee-Erie lobe, Avhich 

 occupied the Maumee and Lake Erie basins. The East White lobe is not 

 included, since it falls naturally into a report, now in preparation, which 

 covers the Wisconsin drift of central and northern Indiana and the southern 

 peninsula of Michigan. 



Although the several glacial lobes form somewhat distinct areas they 

 are discussed together, each morainic belt being traced so far as possible 

 through the several lobes. The lake history, although closely interwoven 

 with the withdrawal of the Maumee-Erie lobe, is taken up after the discus- 

 sion, of the moraines of that lobe. 



SECTION I. EARLY WISCONSIN DRIFT OF THE MIAMI LOBE. 



THE OUTER OR HARTWELL MORAINE. 

 DISTRIBUTION. 



The Hartwell moraine receives its name from the village of Hartwell, 

 Ohio, which stands at the extreme end of the morainic loop, in Mill Creek 

 Valley, a few miles north of Cincinnati. The general course of the moraine 

 may be seen by reference to PI. XI. From Hai'twell it leads northeast- 

 ward, leaving Mill Creek Valley at Sharonville, and rising to elevated land 



1 Preliminary report on the terminal moraine of the second Glacial epoch, by T. C. Chamberlin: 

 Third Ann. Kept. U. S. Geol. Survey, 1883, pp. 291-402. 



