Marcou’s Geology of the United States, 327 
2. Permian Rocks in the Rocky Mountains. 
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“Shortly after quitting the Colorado Chiquito we found here, 
& of the red clay of the Trias and in concord- 
beds contain fossils badly preserved; among which I recognised, 
however, a Nautilus, a Discard and a Belemnites. This forma- 
tion, which is placed between the Carboniferous and the Trias, 
’ the first discovery of the Permian in the _ Mountains, 
: basing it upon this very observation, stating that this magnesvan 
f was concaaile by him with the magnesian limestone of 
Sogland, but that the fossils were too imperfect for determin- 
tion. soi des 
Here then, although the Permian magnesian limestone of one 
part of England is not represented by a similar ail in all 
Published in the Pacific Railroad Reports, vol. iii 
~ See this Journal, this volume, p. 260. . 
