96 GEOLOGY OF OHIO. 
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In southern Ohio the Waverly group is very largely developed, attain- 
ing a thickness of not less than five hundred feet, and being well exposed 
in the valley of the Scioto. For the most part the outcrops lie on the east 
side of the river, but the Waverly caps a great number of eminences 
on the west side of the valley, specially the group of hills known as the 
“Sunfish Hills,” and these outliers extend as far west as the ‘“‘mount- 
ains” of Highland county. The details of the extent and structure of 
the group in this part of the State will be found given in the reports of 
Professors Andrews and Orton. Asa general rule, the formation is here 
composed of a series of alternations of sandstones and shales, and is not 
susceptible of division into distinct members, as in the northern part of 
the State. It is generally barren of fossils; but in certain localities, and 
at certain horizons, it is highly fossiliferous. At Sciotoville, Rockville, 
and Buena Vista collections of fossils have been made which rival in 
variety and interest those obtained from Richfield, Lodi,and Weymouth, ~ 
in Medina county; alarge number of species being common to the two 
districts. Lists of the species collected at Rockville and Sciotoville 
are given in the report of Prof. Andrews, in his contribution to our first 
Report of Progress (1869). Prof. Andrews also mentions in his report 
that two fossils, Iingula subspatulata and Discina capax, are common to 
the Huron shale and the “ Waverly black slate” (Cleveland shale). This 
is probably an error of identification, as, so far as yet known, the fossils 
of the two formations are quite distinct. 
In the Waverly of Scioto and Pike counties certain layers of sandstone 
are found which furnish one of the most beautiful building stones known in 
the country. One of these, called the City Ledge, supplies a large amount 
of stone to the cities of the Ohio valley. This lies immediately above the 
black shale of the Waverly. Some of the flagging from the quarries of 
W.J. Flagg, in the Waverly hills near the Ohio, and known as the Buena 
