36 F. V. Hayden on the Geology of Kansas. 
miscus, clearly indicates the introduction of the Permian 4 
enus Monotis, however (as the name is here applied), — 
also occurs far below the horizon where he would make the q 
line of separation,—hundreds of feet, indeed down in what he 2 
includes in the Coal-measures, even near the level of the Mis q 
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a species of Pleurophorus from the Keokuk Limestone, of the 
Mountain Limestone series, at Warsaw, Illinois, as nearly like 
* It may be of some interest Hi Rapere a : 
sils recently sent to the Smiths se mete here, 5 ana entrisig seme Oe 
in Take Titicaca, South America, 14,500 feet above the sea, | 
" Strata of Kansas, and the Black Hills in Nebraska. And yet these rocks in the high 
"instances with thove of our western Goalmmatarea, eT umnce aeve® io several 
