78 
Aug. F. Foerste 
Streptelasma canadensis, and other fossils, suggests a probable 
equivalency of this coral horizon to a similar assemblage of fos- 
sils at the base of the fossiliferous section beneath the Saluda 
horizon, in Jefferson, Bullitt, Nelson, Washington, and Marion 
counties, in the more western part of Kentucky. This horizon 
is regarded as belonging at the base of the Liberty section. 
The statigraphical position of the specimens of Strophomena 
at Howards Mill, Spencer, and Indian Fields, is regarded as at 
least as high as the middle of the Blanchester division of the 
Waynesville. Owing to the fact that southward the vertical 
distribution of the more characteristic Richmond brachiopoda 
becomes rapidly restricted, until at Owingsville it is confined to 
the basal part of the Liberty and the upper half of the Blanchester, 
it is assumed that this is the horizon most likely to furnish fos- 
sils farther southward, in Montgomery and Clark counties. At 
Owingsville, Dinorthis subquadrata, Rhynchotrema capax, and 
Streptelasma canadensis occupy a horizon feet thick. Leptaena 
rhomhoidalis and Plectamhonites sericea occupy a section H feet 
thick, immediately beneath, and are regarded as forming the 
base of the Liberty here, the Hehertella insculpta layer being 
absent. Strophomena neglecta and Strophomena vetusta range 
from 10 to 11 feet below the top of the Waynesville, and Stro- 
phomena planumhona occurs half a foot lower. As a matter of 
fact, the Strophomena horizons in Montgomery and Clark coun- 
ties may belong even as high as the upper Liberty. In the absence 
of fossils distinctly diagnostic of the Liberty or of the Waynes- 
ville, an element of uncertainty must remain. 
Since at Merritts Ferry the layer with Tetradium, Stromato- 
cerium and Columnaria occurs 90 feet below the Clinton, it is 
probable that the horizon in the northeastern part of Madison 
county, 1 mile east of College Hill, containing poor specimens of 
Strophomena and Streptelasma, 93 feet below the Clinton, belongs 
to the same horizon, namely, the base of the Liberty. Stro- 
phomena sulcata ranges at the same locality from 31 to 40 feet 
beneath the Clinton, in strata regarded as equivalent to the 
Whitewater. At Cobb Ferry, nearly 3 miles southeast of College 
Hill, Strophomena vetusta and Streptelasma canadensis occur 
between 54 and 63 feet below the Clinton, and Streptelasma 
canadensis ranges about 5 feet lower. This also should belong 
to the Liberty horizon. 
