OF DENISON UNIVERSITY^ 
25 
ing the results it may be convenient to give a brief synopsis of the hor- 
izons as represented in Central Ohio. 
Sandy shales and freestone 
Shales and freestone 
Shale - - - . 
Conglomerate II 
Shale - - - - 
Freestone - 
Conglomerate I 
Shales - - - 
Shales, concretionary - 
Lower Berea Shales 
Berea grit &c. 
Bedford shale 
30 
ft. 
1113. 
100 
ft. 
1112, 
5 
ft. 
nil. 
7 
ft. 
II2. 
40 
ft. 
III. 
60 
ft. 
Is- 
30 
ft. 
I4. 
0 
00 
ft? 
I3 
100 
ft? 
I2. 
40 
ftl 
ill. 
As may be seen by this section, the strata are divided into three 
portions, the first lying below the Chester limestone in Fairfield 
Connty, but farther north under the Carboniferous conglomerate, the 
second portion lying between conglomerates I and II, while division I 
rests on the Huron shale in Franklin County, but in Cuyahoga County, 
the Cleveland and Erie shales are interposed. For a correct under- 
standing of the relations of the divisions farther north, it will be neces- 
sary to give a brief summary of the subdivisions as represented in Lick- 
ing County. The Bedford shale (Ii) is well exposed at Central Col 
lege, Franklin County, where it lies immediately upon the Huron shale. 
It is of a chocolate color and can be easily traced on account of that 
lithological peculiarity. Five feet above the base, the following char- 
acteristic species were found, Macrodon hamiltonae^ Leda diversa and 
Orthis vaituxemi. Lying on this is the Berea grit ( 1 2) which may be 
one hundred feet thick but absence of exposures renders it very un- 
certain Next in order is the Lower Berea shale (I3). 
The stratigraphical relations , of this portion of the Waverly have 
not been made out, but it may be 180 feet thick. Two fossiliferous 
layers are contained within this subdivision as far as known, the first 
being well exposed on Rocky Fork, three miles from Gahana, Frank- 
lin County. Only two species were obtained here, viz : Orbiciiloided 
newbetryi and Lingula melie, which are very abundant at a considerable 
distance above this. In the same subdivision is another fossiliferous 
zone from which many specimens may be obtained by a patient collect- 
or. Atripa reticularis, Strophomena rhomboidalis and Proetus haldemnui, 
with several other species, are found in this stratum. Resting on the 
