Jan., 1912.] 
The Arnheim Formation 
447 
also at Newsom, about 15 miles southwest of Nashville. At 
Clifton, on the Tennessee river, about So miles southwest of Nash- 
ville, Rhynchotrema dentata occurs associated with Dinofthis 
carleyi, Leptaena richmondensis , Dalmanella jugosa var., and 
Columnaria alveolata, at the Arnheim horizon. 
The connection of these Arnheim localities in Tennessee with 
those in Kentucky is hidden at present by the covering of later 
rocks. This connection probably extended from the vicinity 
of Gallatin, in Tennessee, northward toward Bullitt county, in 
Kentucky. It is significant that the most southern exposures in 
Kentucky containing Dinorthis carleyi are in the northern part of 
Nelson county, on the western side of the Cincinnati geanticline, 
and in Mason county, on the eastern side. In the large series of 
exposures of the Arnheim, connecting these localities across central 
Kentucky, Dinorthis carleyi is unknown. Moreover, even Lep- 
taena richmondensis and Rhynchotrema dentata disappear from the 
Arnheim along the axial part of the Cincinnati geanticline and along 
its eastern side long before reaching the Cumberland river in 
southern Kentucky. 
11. Southern Kentucky along the Cumberland River. 
Richmond strata, containing Streptelasma , Stromatocerium, 
and Columnaria, probably Columnaria vacua, are exposed along 
the Cumberland river, in the northern part of Wayne county, 
opposite the mouth of Forbush creek, and about a mile farther 
west, below the mouth of Little Cub creek. This horizon probably 
corresponds approximately to the base of the Liberty member of 
the Richmond, as exposed in central Kentucky. Farther down 
the river, the thin bedded strata, forming the Waynesville member, 
are exposed. Along the southern border of Russell county, at the 
northern end of the first bend made by the Cumberland river on 
reaching the county, a globular Prasopora and Heterospongia 
subramosa are present immediately above strata containing 
Platystrophia ponderosa. Stratigraphically, this Prasopora here 
occurs at the Arnheim horizon, but no diagnostic fossils were 
found. The same horizon is exposed again at Harmon creek 
shoals, about four miles farther down the river. 
No specimens of Prasopora have been seen at the exposures 
below Creasy creek, below Indian creek, below Willis creek, or at 
any of the other exposures farther down the Cumberland river, 
in Kentucky, where strata equivalent to the Arnheim might be 
expected to occur. 
12. Globular bryozoans in Casey and Lincoln Counties, Kentucky. 
At Kidd’s store, in Casey county, about eight miles northeast 
of Liberty, on the road to Hustonville, a globular brvozoan identi- 
fied in the field as Prasopora, occurs at the Arnheim horizon, 
