Contributions to Palceontology. 



185 



the limestone being absent ; and that it is this arenaceous 

 deposit greatly augmented, which gives the Sandstone 

 formation of the south shore of Lake Superior. 1 



In 1846, Mr. C. C. Douglass discovered a fossiliferous 

 magnesian limestone resting upon sandstone on the south 

 side of Keweena point, in a line between the head of the 

 Bay and the mouth of the Misery river. In 1848 or 1849, 

 Messrs. J. W. Foster and J. D. Whitney brought from 

 this locality several species of fossils, which were submitted 

 to the examination of the writer. The geologists of 

 Michigan represent that the same sandstone, at Grand 

 island, is succeeded by a fossiliferous limestone, which is 

 doubtless the same as that of Keweena point. 



The characters of the fossils from the locality on Keweena 

 point is such as to leave no doubt that the limestone is 

 equivalent to the Bufflimestone of Wisconsin ; holding the 

 identical fossils, and representing the Birdseye and Black- 

 river limestones. The order of sequence in Central and 

 "Western Wisconsin, and in Iowa and Minnesota, is that 

 already given, viz : 



Buff limestone == Birdseye & Black-river ; 



St. Peters sandstone ; 



Lower Magnesian limestone. 

 Now the beds of Buff limestone at Keweena point rest 

 upon a sandstone which has a much greater thickness than 

 the St. Peters sandstone is known to have in any of its 

 western localities ; nor has the Lower Magnesian limestone 

 been seen below that sandstone, so far as we know; 

 unless the magnesian limestone seen by Mr. Murray, of 

 the Canadian Survey, at the mouth of the Dead river, 2 



Geology of Canada, 1863, pp. 83-86. 



2 On this [the south] coast at the mouth of the Dead river, north of 

 Marquette, there is a mass of very ferruginous dolomite, of which the 

 stratification is not very distinct ; but it is overlaid by the sandstone, which 



[Trans, v.] 24 



