626 



GEOLOGY OF CENTRAL WISCONSIN. 



main Archaean region of the district, no marked evidence of glacia- 

 tion has been observed. The following is a tabulation of the obser- 

 vations made: 



DIRECTIONS, ETC., OF GLACIAL STRIDE AND FURROWS. 



The linear topography, seen in lines of marsh, in the directions of 

 streams, valleys, narrow ridges, and lakes, and in the outlines of the 

 areas of the geological formations, has been described before, as char- 

 acterizing especially the region of Dane and Columbia counties; and 

 the bearings of these lines have been shown to coincide with the bear- 

 ings of the glacial striae. A very brief examination of the table just 

 given, together with Plates XXYI and XXYI A of this volume, and 

 the Atlas Plates of Areas D and E will serve to show the following 

 interesting facts. Beginning on the southeast, in the towns of Albion 

 and Pleasant Springs, and following a curving course northwestward 

 to the country about Lodi in Columbia county, we find the glacial 

 striae and the linear formation outlines, stream, lake, and marsh direc- 

 tions, etc., undergoing a gradual but steady change from a nearly due 

 south direction to one as nearly due west, and we find this westerly 

 direction continued further northward into the country of -the Baraboo 



i True bearings. 



