22 
BULLETIN OF THE LABORATORIES 
decided carboniferous habitus. At Rusville the following section is 
exposed : 
Shale, with Procluctus semireticulatus and 
Spirifer slriatiformis too ft. above congl. II. 
Shales and thin bands of freestone 30 ft. 
( Pleurotomaria, etc.) 
Nodules of lime (fossiliferous) 65 ft. above congl. II. 
Shales. 
Freestone, 40 feet above congl. II. Nau- 
tilus sp., Hemipronites, Productus 
arcuatus, elc about to ft. 
Shales about 30 ft. 
Conglomerate and sandy freestone 5 ft. 
“ Conglomerate II forms the basal, 18 inches or so, and here is not very 
coarse. 
Shales, with Allorisma winchelli, Prothyris meeki, Sanguinolites obliquus, 
Grammysia ventricosa. and Pholadella newberryi. 
'I'his last is the lowest horizon seen in this part of the state and cor- 
responds to the shales overlying the freestone in Licking county. 
The fauna found at the highest horizon of Waverly in Licking county, 
is here encountered here near the top and the various species can be al- 
lotted to their position in the series with unexpected ease and cer- 
tainty. 
The little excursion thus made into Muskingum and Perry coun- 
ties enables us to complete the series in its normal condition. How- 
ever, the moment we turn our attention to our allotte'd task in Licking 
county, we discover that the series is imperfect at one point. While 
conformity between the upper Waverly and lower Chester does not 
exclude the idea of a considerable interval of time between the fossil- 
iferous bands of the two groups, it is apparent that in Licking county 
the Chester interval is unrepresented and that much of the upper Wa- 
verly is generally absent, so that the white sandstone or conglomerate 
of the coal-measures lies unconformably on one or other of the Waverly 
beds and the upper surface of the Waverly itself has obviously suffered 
erosion. The amount of the erosion varied in different places and where 
greatest is covered by coarse quartz pebbles of granitic origin mingled 
with coal measure trees of large size. 'The suggestion of extensive erosion 
been heretofore made, but absolute proof has been wanting. It is has 
our privilege to complete the evidence and to point out in general the 
amount of loss thus incurred. It has been quite generally supposed 
