shaly in the middle and finally a clay shale at the top, in cut 8. From 
the exposures in cuts 4 and 5 it appears that a slight local unconformity 
may exist below this shale. In’ the enstern part of 8, the middle limestone 
first appears. Section II shows it to be 77 feet above the Mitchell as 
exposed in the valley below, 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 
horizon. The correlation is based on stratigraphic, lithologie and paleon- 
tologic evidence and on the presence of springs in a few instances, It 
thickens progressively to the west, and on the east bluff of Richland 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 sandstone forms one of the prominent features of the topography. It 
is a reddish, ferruginous, laminated 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, 
