360 The American Geologist. December, 1902. 
vician times. To the writer, the evidence adduced does not 
appear as yet to be sufficient. Moreover, the arguments in fa- 
vor of the existence of the anticHne in later Ordovician times 
or during the Silurian period do not seem as yet to be alto- 
gether conclusive. However, the presence of this fold in early 
Devonian times may be definitely established by means of the 
evidence now at hand. This evidence consists in the presence 
of Silurian strata along the flanks of the anticline and in their 
absence along the crest. In consequence, the later Devonian 
deposits rest directly upon Ordovician strata along the crest of 
the anticline, but upon Silurian formations along its flanks. 
This evidence is found in south centi-al Kentucky and in north- 
ern Tennessee. 
In central Kentucky, the Devonian rests on Silurian form- 
ations, along the western flank of the anticline, as far east as 
Loretto and Raywick in the western part of Marion county. 
East of these localities for a distance of 40 miles, as far as 
Stanford in the western part "of Lincoln county, the Devonian 
rests directly upon the Ordovician. Southeast of Stanford, 
however, near Neals Creek church, the Silurian is exposed, and 
from this point eastward and northward along the eastern 
flank of the anticline, the Devonian rests again upon the Silur- 
ian. 
In northern Tennessee, the most eastern exposures of Si- 
lurian rocks along the western flank of the Cincinnati anticline 
occur several miles west of Lafayette in Macon county. 
Thence eastward for a distance of more than 50 miles, both 
along the northern border of the Central Basin of Tennessee 
and along the Cumberland river, the Devonian rests directly 
upon the Ordovician. The most western exposures of Silurian 
rocks along the eastern flank of the anticline occur near the 
mouths of Little Cub and Forbush creeks in Wayne county, 
Kentucky. 
The areas within which the Silurian strata are absent, be- 
tween Loretto and Stanford, and between Lafayette and Little 
Cub creek, lie along the crest of the present Cincinnati anti- 
cline. The absence of the Silurian in these areas may be ac- 
counted for most readily by assuming that the anticline existed 
at least before the deposition of the later Devonian formations 
now found in place. Whether the anticline existed already in 
