LYON—ROCKS OF KENTUCKY. 621 
v. Spirifer grigaria and Turbo (?) Beds.—This mass is 
generally about ten feet thick at one locality, the upper part 
divided into two distinct horizons of Spirifer grigaria, associ- 
ated with numerous other fossil forms. Beneath the grigaria 
beds, the mass consists of thick bedded limestone containing 
broken and water-worn fragments of shells, also fragments 
and a few teeth of sauroid fishes. This part of the mass of v 
is sometimes distinguished as the fish bed. The Spirifer and 
Turbo referred to have a limited range and are confined to the 
upper half of this bed. Pleurorynchus occurs occasionally in 
the lower part of the bed, but it is not certain that the species 
is confined to it. 
w. Coral Beds.—These beds are about ten feet thick at the 
falls of the Ohio, and are distinguished by the number of the 
genera and the vast number of the individuals of forms re- 
ferred to the corals and allied families. Brachiopoda and 
other forms of shell fish are very rare. 
x. Catenipora escharoides Beds.—This peculiar form rises to 
the base of the mass w in considerable quantities ; at some lo- 
calities the surface of the rock at the base of w being paved 
with great plates of it. This fossil is known to have a verti- 
cal range in the vicinity of Louisville of about forty feet. 
Occasionally, small specimens have been found in the top of 
the mass of u. These are however water-worn and may have 
been deposited in this latter bed, long after the animal produ- 
cing it had ceased to exist. It may. have been was ed from 
the beds long previously deposited, and which were suffering 
denudation and waste, during the period of the deposition of 
the beds represented by z. ; ‘ 
he divisions of the lower part of the foregoing section - 
those which naturally present. themselves to the collector 0 
their fossil remains. 1 
At some future period, it is proposed to refer to the shin 
beds enumerated all the fossils peculiar to each, as well as t raga 
Whose range extends through one or more of the raha we ‘ 
also to make further divisions in some of the masses in Wil¢ 
