MEDINAN, NIAGARANj AND CHESTER FOSSILS 
43 
Guelph may occur there also, for instance, in those Silurian 
deposits which occur west of Vanceburg on the road to Valley. 
The bituminous horizons of the so-called Guelph in the Hills- 
boro area may be traced northwest of the town on the road to 
Wilmington, and similar strata, but without the bituminous 
content, appear to occur near New Vienna, northeast of Snow 
Hill, in the area between New Vienna and Wilmington, Ohio. 
From Wilmington northward, however, the Niagaran section 
resembles that found in Greene, Clarke, Miami and Montgom- 
ery counties. Here the following section is found, in descending 
order. 
(Cedarville dolomite 
Durbin formation j Springfield dolomite 
[Euphemia dolomite 
^Taurefi’ limestone 
^Hsgood” clay shale 
Dayton limestone 
Brassfield limestone 
Belfast bed. 
In this section the strata called the Euphemia dolomite are 
those included by Professor Orton in his West Union bed when 
using that name for the tier of counties here named. It is the 
Mottled bed of Professor Prosser. It is fre€(uently exposed 
between Springfield, Ohio, and Lewisburg, in the western part 
of the state, but is unknown at Cedarville, where the lowest 
dolomitic rock in the gorge half a mile west of town belongs to 
the Springfield horizon. 
Immediately beneath this Springfield dolomite,* fin the gorge 
west of Cedarville, there is a clay shale, of which a thickness of 
scarcely 6 feet is well exposed, the basal part not being seen. 
This clay shale contains, at a level 2 feet below its top, Strepte- 
lasma radicans Hall, Eucalyptocrinus crassus Hall, Schuchertella 
subplana (Conrad), Leptaena rhomhoidalis (Wilckens), Plecta7n~ 
bonites transversalis (Wahlenberg), Dalmanella elegantula (Dal- 
man), Spirifer radiatus (Sowerby), Atrypa reticularis iiewsomen- 
sis Foerste, Dictyonella reticulata (Hall), Strophostylus sp., and 
Dalmanites verrucosus (Hall). This is a Waldron fauna. 
