ENGLACIAL DRIFT OF THE MI SSI SSI PI BASIN. 53 



Emerging from the dunes at a point north of the Iroquois 

 river in Jasper county, northwestern Indiana, a well characterized 

 belt of surface boulders stretches westward to the State line, just 

 beyond which it curves about to the south and then to the east, 

 and re-enters Indiana a little south of the northwest corner of 

 Benton county. It soon turn^ abruptly to the south and reaches 

 the Wabash river near the centre of Warren county. The im- 

 mediate valley of the Wabash is thickly strewn with boulders 

 from the point where the belt reaches it to the vicinity of West 

 Point on the western line of Tippecanoe county. The up- 

 lands, however, do not give any clear indication of the con- 

 tinuity of the belt, and the connection is not altogether certain. 

 There is an inner well-marked belt that branches away from 

 this in the central part of Benton county and runs southeasterly 

 into the northwestern quarter of Tippecanoe county, beyond 

 which only scattered boulders occur, which leaves its precise 

 connections also in doubt. But starting from West Point, which 

 is less than a dozen miles from the point where the two belts 

 cease to be traceable with certainty, a well-defined belt, one or 

 two miles wide, runs southeasterly across the southwestern corner 

 of Tippecanoe county and the northeastern quarter of Mont- 

 gomery county to the vicinity of Darlington, beyond which its 

 connection is again obscure, although boulders occur frequently 

 between this point and the northwestern corner of Brown 

 county, where boulders are very abundant. So also, patches of 

 exceptionally abundant boulders occur in the west central part 

 of Clinton county. These may be entitled to be regarded as a 

 connecting link between the train which enters northwestern 

 Tippecanoe county and that of northwestern Boone county, as 

 scattered boulders of the surface type, but of not very excep- 

 tionally frequent occurrence, lie between them. However this 

 may be, a belt of much more than usually frequent surface 

 boulders stretches southeasterly to the vicinity of Indianapolis, 



p. 404) and Orton and Hussey cf the Ohio Survey (Geol. Surv. Ohio, Vol. III., pp. 

 412, 414 and 475). The relationship of these tracts to morainic lines and to each 

 other I worked out some years since (Third An. Rep. U. S. G. S. pp. 331, 332, 334) 

 but I owe many details and some important additions to my associate, Mr. Leverett. 



