BEDFORD AND BEREA FORMATIONS IN CENTRAL OHIO 589 
No. 
have a thickness of 11 in. and some are also ripple- 
marked. Rather more than 8 ft. of these layers 
are shown in the wall of the old quarry......... 
. Buff, rather fine, quartz-grained sandstone, the 
layers generally varying from 3 to to in. in thick- 
ness; but some of them are rather thin or even 
shaly. It contains grains of marcasite and on 
weathering shows numerous brown spots......... 
8. Thin-bedded to shaly, buff sandstone........... 
TPS andy; WiktSMalett alco cm Oe Scape ceca eae s 
. Very fine, quartz-grained, buff sandstone zone, the 
lower part of which at the eastern end is somewhat 
contorted, apparently from concretionary action. 
On weathered surface this sandstone is not dark 
brown and rotten like the lower sandstones on this 
bank. The bottom of this sandstone is irregular, 
conforming to the irregularities in the surface of 
the underlying shale. This zone is considered the 
base of the Berea formation and is separated by a 
line of disconformity from the underlying shale... 
. Bedford formation—Blue, soft, argillaceous shale 
the upper surface of which is uneven, the zone 
varying in thickness from 2 to 6in.............. 
. Layer of calcareous, blue, very hard, compact sand- 
stone which weathers to a brown color, and the 
rock becomes rotten. The layer varies from 4 to 
5in.in thickness. It contains 83 per cent of CaCO,, 
and MgCO,, which gives it a marked chemical dif- 
ference from that of the superjacent Berea sand- 
SUOM EM ee tara: eure teas eles Neos elanentydiecg erate et ite: cheats 
. Mainly blue, soft, argillaceous shale; but with an 
occasional thin, bluish (brownish as weathered) 
sandstone layer varying from 4 to 14 in. in thickness 
. Blue, very hard, compact, calcareous sandstone, 
weathering to a dark-brown color and becoming 
rotten. It tends to split into two layers and varies 
in thickness from 1 ft. 9 in. to 2 ft. It is strongly 
calcareous, containing 26.35 per cent of CaCO, 
Gi) aVO 1 Ed OKO Fen oe calle oer ae eee riceic i lee cee em 
. Blue, arenaceous and argillaceous shale alternating 
with layers of blue, hard, compact, calcareous sand- 
stone, varying from 1 to 63 in. in thickness and some 
of them ripple-marked. Stream level............ 
Thickness 
Feet 
Se 
Total 
Thickness 
Feet 
tle 
40 
322 
19+ 
17¢ 
