iS4 



FRANCIS M. VAN TUYL 



SIGNIFICANCE OF THE CHANNEL DEPOSITS 



The channel deposits in the Coal Measures of Iowa and Mis- 

 souri are very interesting in this connection in that they furnish 



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Fig. 2. — Map showing variations in thickness of Cherokee formation in Missouri. 

 The influence of the basin is shown when this map is compared with that of Fig. i . 



corroborative evidence of the persistence of the basin in post- 

 Cherokee time. With reference to such deposits in Missouri 

 Hinds and Greene say: 



Among the most unique features of the Missouri Pennsylvanian are two 

 long, narrow channels filled with sandstone and shale which have been eroded 

 in Cherokee, Henrietta, and some Pleasanton strata in Johnson, Lafayette, 

 Randolph, and other counties. Remnants of other channels have also been 

 found in many parts of the Pennsylvanian area, and many more probably remain 

 to be discovered as the net of detailed geologic work is spread over the state. 



The channels are of great scientific interest, for they must have been formed 

 during an interval of more or less widespread emergence and erosion during 



