STUDIES IN THE DRIFTLESS REGION OF WISCONSIN 1 83 



Distribution of transported material on the higher slop $s. — Most 

 of the deposits previously described fall between the horizon of 

 the present river-level and that of the highest terrace, so that 

 although there seems to be excellent reason on other grounds 



Fig. 3. Scale 300 ' to an inch. Adapted from the village plat, which I used as 

 the foundation. J 



/. End of a short spur or projecting angle of one of the higher bluffs. 



e. End of a long spur forming the northeast valley rim. 



g, h. Rock shelves sloping gently from their adjacent hills. 



ab. The bowlder ridge, the south end of which lies over the old rock valley, 

 shown in entire lines, while the present drainage indicated by dotted lines runs further 

 west just inside of the ridge. It has both an outward and an inward slope plainly 

 apparent in spite of the loess, which, however, as the street cutting shows, greatly 

 exaggerates its apparent breadth and diminishes its apparent height. The bowlder 

 bed doubtless covers all of the shelf h, but being heavily covered with loess I have 

 only indicated that part which is uncovered. On its south front it declines from a 

 thickness of about twelve feet or fifteen feet to nothing in the width of a street. 



The asymmetry of the deposits, i. <?., their presence on one side of a valley, and 

 apparent absence on the other has been something of a difficulty in working out the 



1 These maps have necessarily been constructed without the aid of special meas- 

 urements. But while they must needs lack the exactness which such a method would 

 have given, they have been carefully constructed from fairly correct data, and after 

 thorough study of the topography, and are essentially correct. The valley bottoms, 

 however, offer especial difficulties, since the series of deposits of which the loess is 

 the top, has been eroded so as to form a most intricate system of ravines of which 

 only the principal ones could be represented. 



