STUDIES IN THE DRIFTLESS REGION OF WISCONSIN 1 87 



panying sketch map, Fig. 6, together with portions of the circs 

 adjoining on either side. A portion of the main bluff, with its 

 limestone cap, is shown in the upper right-hand corner (in order 



Fig. 6. Contour sketch map of a single buttress with a portion of its primary 

 bluff, a, to illustrate the distribution of the limestone debris as shown in connection 

 with the circs. Parts of two circs are shown, b and c. 



The dotted portionshows where the limestone debris occurs. I have endeavored 

 to show its relative abundance by the concentration of the dots. It should be observed, 

 however, that while on the side furthest from the circ it is really represented by only 

 scattered fragments, in the thickest part next the circ it is piled up to a thickness 

 apparently of several feet. The side of the buttress toward the circ c is steep but not 

 precipitous, but that toward b is a vertical escarpment several hundred feet long, and 

 twenty to fifty feet high. 



Scale 400' to an inch. Contour lines at intervals of 25'. 



to be more easily distinguished by the eye, the base of the lime- 

 stone is represented by heavier contour lines). The dotted area 

 on the east side of the buttress shows the portion covered by 

 transported limestone. It is most abundant immediately adjoin- 

 ing a circ, diminishing as we recede from that, but not entirely 



