Review of Geinitz on the rocks and fossils of Nebraska. 339 
series; also that there is no defined break between this interme- 
diate series, and the Permian above, or the Coal-measures below. 
Indeed all the phenomena here indicate a gradual change of 
physical conditions which had probably so nearly approximated 
those of the Permian in this region, long before the proper close 
of the Coal-measure period, as to favor the introduction, at certain 
Coal-measures and the Permian. Possibly after much more 
extensive collections of fossils have been obtained from these 
nerease, : 
In conclusion, I would state, that I hope sometime to have the 
ogist as he undoubtedly 
ee 
