144 



SALISBURY AND ATWOOD 



Skillett Creek. — Skirting the morainic apron or overwash plain 

 southwest of Baraboo, is a little stream, tributary to the Baraboo, 

 known as Skillett Creek. For some distance from its head (« to 



Fig. 7. Skillett Creek, illustrating the points mentioned in the text. 



b, Fig. 7) its course is through a capacious preglacial valley. 

 The lower part of this valley was iilled with the water-laid drift 

 of the overwash plain. On reaching the overwash plain the creek 

 therefore shifted its course so as to follow the border of that 

 plain, and along this route, irrespective of material, it has cut a 

 new channel to the Baraboo. The postglacial portion of the 

 valley {b \.o c^ is everywhere narrow, and. especially so where 

 cut in sandstone. 



The course and relations of this stream suggest the following 

 explanation : Before the ice came into the region, Skillett Creek 



