BEDFORD AND BEREA FORMATIONS IN CENTRAL OHIO 595 
sandstone, zone No. 2, which have been analyzed by Professor D. J. 
Demorest with the following result: 
Near the Top of | Base of Zone No. 2 
Tone Now (Concretionary 
Sandstone) 
| 
Per cent | Per cent 
CaC Oran teen eet. 16.5 | 1.6 
VES CO ee ee ea oa tna Beats) | 0.0 
TROY See ee  R Uereeene t ee iat 2.0 
HIRI @ Sept tet. ena gan ee 0.2 0.2 
(Clay Pere ra ee sais 17.4 | Mie 
QUAarEZ ES tice es eens 48.0 | 70.0 
Held sparse uct eve en age 9.0 | TO 
In the above analysis it will be seen that the thin sandstone a 
few inches below the top of zone No. 1 contains 20.3 per cent of 
calcium and magnesium carbonates, which a few inches higher in 
the base of the concretionary sandstone (zone No. 2) decrease to 
1.6 per cent. On the other hand, the lower sandstone contains 
only 48 per cent of quartz, which in the base of zone No. 2 has 
increased to 70 per cent. The chemical composition of these sand- 
stones, separated by only a few inches of shale, is decidedly different 
and strongly supports drawing the line of separation between the 
Bedford and Berea formations at the base of the concretionary 
sandstone as given above, where it had been placed on structural 
evidence. 
The line of division between the Bedford and Berea formations is 
not so clearly shown on the next cliff on ascending the stream which 
is on Its opposite side. The base of a sandstone layer varying from 
4 to 6 in. in thickness, which in some places has concretionary 
structure and in others is broken and displaced, has formerly been 
considered the base of the Berea.‘ The concretionary layer of the 
lower bank is at about the same level as this sandstone as nearly 
as can be determined by hand level. Eleven to 16 in. below this 4- 
to 6-in. sandstone is a thinner one which perhaps should also be 
- included in the Berea formation. The section of the lower part of 
this bank is as follows: 
t American Geologist, XXXIV (1904), 340, footnote, No. 2 of section, and also see 
Pl. XVIII, Fig. 3, where the student stands on top of this sandstone. 
