JViwcrly Formations of Central Ohio. — Prosscr. 343 
No. Thickness. 
3. Sunhury shale, thin laminated hiack shale only 2o'<f 
tlie base of which is shown in the run, but 
higher in the field 20-)4 feet. 
2. Boca sandstone. Thin, irregular lx;dded SV' 
browni.sh to rusty colored sandstone, 3 feet 
7 inches on the northern bank and 4 feet 2 
inches on the southern. 
I. Bedford shale. Upper part is bluish-gray I3'6'' 
soft argillaceous shale. A little farther down 
the run near the base of the exposure is some 
mottled gray and faintly chocolate colored shale. 
SECTIONS SOUTHWEST OF MTHOPOLIS 
Big run. the largest southern tributary of Little Walnut 
creek, crosses the county line road near where Franklin, Pick- 
away and Fairfield counties corner. Bedford shale is soon 
reached on this stream when it is followed above the county 
line road crossing, considerable of which is of reddish color. 
Less than half a mile above the road crossing on the land of 
Mrs. L. J. \\'hite. the western bank of this run is about 35 feet 
high and composed entirely of Bedford shale. The lower nine 
feet is chocolate to mottled in color, while the remaining part 
is mostly gra}ish. In the shale about 18 feet above the stream 
level is a large concretion. The shale in the bed and banks of 
the stream from the base of the cliff just described to a point 
above the second branch from the east is mainly reddish in 
color. 
Harfnian Run Section 
The first branch from the east, a few rods above the high 
western bank, is on the land of Mrs. S. E. Hartman and may be 
called Hartman run. It gives the following section : 
Total 
No. Thickness, thickness. 
7. Cuyahoga formation.. Alternating beds of 21 8o'8" 
grayish fine grained sandstone and bluish 
argillaceous shales are shown for some dis- 
tance up the run. 
6. Fairly massive, grayish, argillaceous sand- 5'+ 59'8' 
stone which has been quarried to a slight ex- 
tent. 
5. Drab, very soft argillaceous shale which 4' — 548" 
measures on the bank 3 feet 11 inches. Base 
of Cuyahoga formation. 
