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ARTHUR C. VEATCH 



downcutting in the older valley. The conspicuous differences 

 in width which exist between various parts of the cut-off are to 

 be explained by the fact that the river entered an old river chan- 

 nel when it came to Pigeon Plain. Nearly all the swampy areas 

 mentioned above are simply parts of the old channel which have 

 been but imperfectly filled. 



An a?icie?it valley from the north. — The ancient stream plain 

 which the Ohio entered after cutting through the hills two miles 

 east of Lake P. O., is locally called Pigeon valley ; but, as has 

 been stated, it is not at present occupied by Little Pigeon Creek. 

 A cross section of the country from E to F, Fig. 1, shows Little 

 Pigeon Creek in a young, V-shaped, rock-bound valley, separated 

 by a hill of sandstone 30 feet high from the broad old alluvial- 

 filled valley east of it (Fig. 12). Another section running east 

 and west half a mile north of Midway shows the same peculiari- 

 ties. Well sections in a few places west and northwest of Mid- 

 way show a depression of 60 feet deep, fielld with blue mud. 



Tertiary gravel beds. — Near the base of the hills north of 

 Enterprise (Fig. 1) is a series of sands and gravels. The roads 

 cut through these bounding hills at different places and afford 

 admirable sections of the formations. A section examined 

 along the road running between sections 3 and 4, township 8, 

 south range 7 west, showed the following strata (Fig. 3): * 



3N THROUGH BLUFF AT a, N.W. OF' ENTERPRISE 

 Fig. 3 



A Hill wash — a reddish sandy clay, - 



B Coarse gravel mixed with sand. The gravel is mostly a 

 much glazed dark yellow chert, but also contains some 



1 The location of this section is shown at i in Fig. 2. 



Ft. 



5 



In. 

 O 



