LYON—ROCKS OF KENTUCKY. 619 
An immense mass of alternate beds of limestone and clays, 
like the lower part of m, has not afforded any considerable 
fossil remains. The lower two hundred feet of 0, on the 
contrary, is as rich in fossil remains as the upper part is bar- 
re out one hundred and eighty feet above the base of 0 
lies the equivalent of the “Spurgen’s Hill” beds of Washing- 
ton County, Indiana, which Professor James Hall considers 
the equivalent of the beds at Warsaw, the beds above Alton, 
Illinois, and those near Bloomington, Indiana.* 
The line of the Louisville and Nashville Railroad, on Clear 
Creek, Hardin County, gives very satisfactory sections of the 
lower part of 0, and the upper part of p. The measure- 
ments of the mass of o have not been entirely satisfactory, 
thickness, which, in the absence of fossils, are hardly distin- 
guishable one from the other. The whole mass is probably 
from five hundred to six hundred feet thick. 
p. Lower part of the Subcarboniferous Series ; | dis- 
tinguished as the ‘* Knobstone Beds.” —The beds represente 
aristown, on the New Albany 
to two miles north of “ Spurgen’s Hill.” The marly beds near 
* See Transactions of Albany Institute, Vol. IV. 
