27S 



shaly in the -iniddle and finally a clay shale at the top, in cut 8. From 

 the exposures in cuts 4 and 5 it ai)pears that a slight local unconformity 

 may exist below this shale. In the eastern part ot S, the middle limestone 

 first appears. Section 11 shows it to l)e 77 feet above tlie Mitchell as 

 exposed in the valley belf>w, which conforms with the dip and thickness of 

 the underlying beds. This limestone appears at nearly every point west 

 of cut 8, where its level is reached and its lower limit is marked by a spring 



Vi'x. ?i. 



horizon. The correlation is l)ased on stratigrnphic, lithologic and jialeon- 

 tologic evidence and on the ]n-esence of springs in a few instances. It 

 thickens progressively to the west, and on the east bluff of Eichland Creek 

 a quarry in it furnished rock for the railway viaduct. The cuts 8 to 21, 

 inclusive, are in the upper sandstone with the exception of 18 and 20. 

 This sandstoue forms one of the prominent features of the topography. It 

 is a reddish, ferruginous, lamiuated stone, appearing soft in the cuts but 

 generally weathering into a hard bluff-forming stone where the drainage 

 has cut through it. At places shale appears at the level of this sandstone. 



