230 
The Ohio Naturalist. 
[Vol. XIV, No. 3, 
The Liberty or Strophomena planumbona beds were assigned 
a thickness of about 35',* and the base was defined as the first recur¬ 
rence of Hebertella inseulpta. The top was not definitely located, 
but by general agreement seems to have been taken as the base 
of a 3'-4' bed of shales and soft, shaly, blocky limestones, contain¬ 
ing Trochoceras baeri, and many characteristic Whitewater clams, 
and with Pachydictya fenestelliformis just above. 
The Whitewater or Homotrypa wortheni beds constituted the 
remainder of the Richmond, until the distinct and even bedded 
shales and limestones at the top were separated from the very 
characteristic soft, lumpy, shaly limestones beneath, and called 
the Elkhorn. 
Beginning with the detailed study of the formation at Madison, 
the lower Columaria reef is here sometimes underlain by as much 
as 10' of the general type of Saluda rocks, only rarely massive and 
with more shale. These strata contain a few poorly preserved 
Liberty fossils, Homotrypa wortheni, etc. It may be said here 
that in Indiana the Trochoceras baeri bed is generally undefined, 
and no sharp distinction can be made between Liberty and White- 
water. These undefined strata have been named Versailles, from 
Versailles, Ind.f 
The lower reef, like the upper, is quite variable in thickness. 
Averaging V at Madison, it reaches 3}^' in thickness on a north 
branch of Razor Creek, five miles north, and then thins out and 
occurs intermittently at several places northward before disap¬ 
pearing. 
Between the reefs at Madison are 6' of shale. This shale is 
A l /2 thick along the road following the valley of a westward 
branch of Crooked Creek, three miles north of Madison. Five 
miles north of Madison the thickness is only 2' 4". In the shale 
are a few poorly preserved Hebertella sinuata, Platystrophia 
acutilirata, and Dystactospongia madisonensis. 
The second reef thins from 2' at Madison to 1' toward Hanover, 
where it has quite a percentage of Calapoecia cribriformis. At 
the locality three miles north of Madison it averages only 8" 
thick, and five miles north is represented only by a hard, tough, 
irregular limestone G"-10" thick with no distinct colonies. Like 
the lower reef, the second occurs intermittently as far north as the 
exposures below the road on the West Branch of Laughery Creek, 
four miles south of Batesville. Huge isolated colonies, sometimes 
4' across, were seen near Versailles. 
Above the second reef are 3'-6' of shales and thin limestones, 
in some places carrying a prolific mollusc fauna. Just at Madison 
this fauna is almost absent, but three miles north were collected 
Dystaetospogenia madisonensis, Dowlsonia cycla, Tetradium 
*Nickles, American Geol. Vol. 32, 1903. Pp. 207-9. 
fFoerste, Science, N. S., Vol. 22, 1905, P. 150. 
