227 



YotixG Valleys. 



The steep-graded, Y-shaped valleys of the south side of the Bean Blos- 

 som Valley have alreadj^ been described iu this article and shown to be 

 postglacial. In Avriting of these valleys Prof. Marsters says:* 



"Traversing the steepest slopes of Bean Blossom are to be fonnd 

 numerous V-shaped valleys, with remarkably steep channels, ending their 

 lower course at the point of intersection of the valley floor with the adja- 

 cent slope. In all cases small alluvial fans are built on the valley floor 

 with their apex projecting but a few feet or yards at most beyond the 

 mouths of the young valleys. In none of the observed cases was it found 

 that the level of the valley floor would extend into the mouth of the young 

 valley. It is therefore believed that the greater part of the ciitting of 

 these young valleys may date subsequent to the preglacial filling. The 

 fact that alluvial fans and not deltas with steep outer edges and flat tops 

 occur at their mouths, suggest that they have been constructed since thci 

 laking of the valley, and hence are regarded postglacial." 



Rea'ersed Drainage Due to Aggrading. 



In section 24, Bean Blossom Township, the little stream which flows 

 through the little gap between the "mainland" and Lost Ridge normally 

 should flow direct to Bean Blossom Creek instead of into Indian Creek. 

 Its head waters are in Bean Blossom Valley proper, not in Indian Creek 

 Valley. The reversal of drainage is due to the aggrading of Bean Blos- 

 som Creelc so that the fall is greater through the gap. 



Change of Channel Due to Aggrading. 



Jack's Defeat Creek, running northeast from Stinesville. from all 

 appearances normally ran just east of the Monon Railroad tiack lie- 

 tween the "mainland" and the lost ridge, previously described, to join 

 the master stream. With the aggrading of Bean Blossom Creek this little 

 creek likewise aggraded itself until, having dammed its lower course witli 

 debris, it turned east and joined Bean Blossom farther up stream. 



Abandoned Channels. 



There are two abandoned channels of considerable size in the region. 

 The one, that of Jack's Defeat Creek, between the "main land" an^ the 



*Loe. cit. p.236. 



