226 A. Winchell on Fossils from the Potsdam 
Art. XXII.—WNotice of a small collection of Fossils from the Pots. 
. dam Sandstone of Wisconsin and the Lake Superior Sandstone of : 
Michigan ; by Prof. ALEXANDER WINCHELL. “a 
The interest which attaches to every vestige of organic life be 
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region three or four miles farther south, it supports the first er i 
liers of the Calciferous sandrock. : Me | 
The high bluffs surrounding the lake are described er : 
Wood (and also by Prof, Hall in the Wisconsin Report) re rae 
sisting entirely of bluish or iron-stained quartzite, exhibits 7 
; . be- i) 
* The present paper was written and accepted for publication in this Journal b* e 
fore I had become aware of the existence of the very important eee patience . 
nograp! i" here ex} J : 
my great admiration. It will nevertheless be observed that Prof. papa form t 
does not embrace a notice of any fossils found as far south as those whi descrip- : 
i that some interest must still at pete 
* Sometimes improperly styled “Spirit Lake.” 
