96 R. Irving—Age of the Quartzites, Schists and 
The rock here is mainly a hard, dark-colored, very compact 
quartzite, though the colors vary from a very light grey in 
° d ° . ¥ 
ing to an old anticlinal axis, but the uniform dip of the strata 
throughout its length proves of course that this is not the case, 
SEcTION 1.—Nortb and South through the south range on section, line 1 of map. A,quartzites; i 
7m i quartrites with some schists ; ce conglomerate; $ P, Sauk Prairie; B V Baraboo Valley; 
, level o: e. : 
fifty or sixty different localities, I found to be uniformly )~ 
and 8.W. and S.E. and N.W., the variations in a few plat 
being evidently due to local displacement. On the cliff side 
and more especially about the lake, these joints, together Wit 
the bedding joints, have so cut the rock into separate blow 
t these have from time to time been thrown down the bl 
by frost and atmospheric agencies in huge rectan 
weighing by calculation from seventy-five to two undred. 
apiece. 4 
