42 
AUG. F. FOERSTE 
building stone where exposed along the abandoned railroad within 
the limits of Hillsboro, and in the quarry in which this railroad, 
as far as finished, terminated in the eastern part of the town. 
The Bisher formation corresponds approximately to the West 
Union or Lower Cliff of Professor Orton, and this name would 
have been retained if Professor Orton ever had described any 
section from the West Union area, or had designated at Hills- 
boro the same boundaries between the West Union and Spring- 
field beds as those adopted later between the Bisher and Lilley 
formations. It is of upper Clinton age. 
Notes on Bisher and Lilley faunas were published in the Ohio 
Journal of Science in the years 1917 and 1919. 
The Bisher fauna can be traced southward from Hillsboro 
throughout Highland and Adams counties, in Ohio, and Lewis 
county, Kentucky, as far as the northern part of Fleming county 
in the latter state. It has not been identified anywhere north 
of Hillsboro, Ohio, but the strata immediately beneath the 
Springfield limestone along the creek half a mile west of Port 
William, in the area northeast of Wilmington, Ohio, appear to 
contain a somewhat similar fauna. But no trace of the over- 
lying Lilley fauna is to be found so far north. 
As a matter of fact, the Lilley fauna appears to be very re- 
stricted even in the Hillsboro area. It is known at various 
quarries in the immediate vicinity of Hillsboro, at several locali- 
ties southeast of Marshall, and apparently also 2 miles north of 
Locust Grove, north of Crooked Creek, on the road to Sinking 
Springs. It has not been identified at any other localities. 
While the Bisher formation can be traced over wide areas in 
Highland and Adams counties, the strata overlying the Bisher 
formation present a complex of which very little is known so far. 
The lithologic character of these strata changes within a few 
miles on proceeding from Hillsboro eastward toward Marshall, 
and many fossil horizons occur in the areas between Hillsboro, 
Alar shall, Bainbridge, and the Ohio River whose relative position 
remains to be determined. 
Only the Bisher formation is definitely known to occur in 
I.ewis county, Kentucky, though lower portions of the so-called 
