219 
These places may indicate lenses in the sandstone or shale of the overlying 
unconformable Pennsylvanian rocks. 
At 18 the cut shows the unconformity and a mass of bog iron ore, coal 
and purplish-drab shale, resting on the sandstone only a few feet above the 
upper limestone. In cut 20 and the top part of 21, Pennsylvanian shale 
rests unconformably on the upper sandstone. 
Between Solsberry and the viaduct, the railroad grade is about on a 
level with the top of the upper sandstone so that nearly all the cuts are 
in Pennsylvanian rocks. At 27, section VI was obtained. ‘The iron ore 
(replaced limestone) of this section appears to be correlative with the upper 
limestone from stratigraphic and faunal evidence, which, however, is rather 
meagre. Coal occurs beneath it, while the sandstone above is probably of 
Pennsylvanian age. 
Owing to the fact that it is replaced, only casts of shells remain, and 
in many cases these are unidentifiable. In view of this the correlation with 
the upper limestone must be tentative. 
