Riclniwiid Group of Cincinnati Anticline. — Focrstc. 347 
mond, Indiana, the Upper Richmond is richly fossihferous. 
Bucania crassa occurs aissociated in the various species of 7^- 
chwodonta, seven feet below the Clinton. HcJicotonia niargin- 
ata is found associated with Bcatricca nndulata fifteen feet be- 
neath the Clinton. It is evident that, notwithstanding- the gen- 
eral scarcity of fossils at most exposures of the Upper Rich- 
mond, continued search will reveal a considerable fauna. Most 
of the forms so far identified seem to occur also in the Middle 
Richmond, but when the l)ryozoans are studied it is probable 
that a number of species will be found restricted to this upper 
subdivision of the Richmond stage. 
At Madison, Indiana, fossils are found in the thin clayey 
partings between the upper layers of the massive banded argil- 
laceous limestone. Immediately above are several feet of fos- 
sihferous clav and fine grained, dense, bluish limestone. These 
contain, in addition to fossils found also in the Richmond beds 
beneath, a few fossils which are apparently typical of this hori- 
zon. Among these are Cyrtoccrina madisoncnsis, Lophospira 
haniinclli, and a species which was described as Holopca linb- 
bardi, but which probably belongs to some undescribed genus. 
Labechia oliiocnsis, Labcchia niontifcra, Tctvadiniu minus, and 
various species of ostracoda are common at some localities, but 
jte found also at lower horizons elsewhere. In the reports of 
the Indiana survey, the beds at the top of the Ordovician sec- 
tion at Madison are referred to as the MnrcJiisonia hainniclli 
beds,* or as the gasteropod layer. Since the most varied fauna 
so far obtained from this horizon was collected in West ]\Iadi- 
son along the brow of Hitz hill, on the western side of the 
Madison branch of the Panhandle railroad, the bed may also be 
called the Hitc bed. The most southern exposure of this bed 
so far seen is located about ten miles southwest of LaGrange, 
near Floydsburg, Kentucky, on the Alexander Sinclair farm. 
The most northern locality known is found two miles north of 
the southern boundary of Ripley county, four miles west of 
Cross Plains, Indiana. The distance between the extreme 
points named is nearly fifty miles. 
Twenty-first Report, Indiana Surrey, 1897, p. 222. 
