BEDFORD AND BEREA FORMATIONS IN CENTRAL OHIO 597 
increased to 66 per cent in each sandstone. It is to be noted that 
the amount of feldspar in the two upper sandstones is 17 and 18 per 
cent respectively, so that they may be termed arkose sandstones. 
These analyses apparently favor drawing the line of division be- 
tween the Bedford and Berea formations at the same horizon, viz., 
the base of zone No. 3, as in the former section of this bank. 
Although the chemical change is not striking, still there is a marked 
decrease in the carbonates of the sandstones of zones Nos. 3 and 5 
as compared with zone No. 1, while the upper sandstones have a 
larger percentage of quartz than the lowest one. 
Smith Run section—In the northwestern corner of Fairfield 
County, 14 miles southwest of Lithopolis and about 4 miles south 
of Canal Winchester, is an interesting section on Smith Run, an 
eastern tributary of Big Run. Smith Run is about opposite the 
Nancy Cole house. 
SECTION ON SMITH RUN 
Total 
No. Thickness Thickness 
: : Feet Feet 
6. Cuyahoga formation.—Blue, fine-grained sandstones 
alternating with shales, some of the sandstone 
layers a foot or more in thickness................ 23% 83 
5. Two layers of fine-grained sandstone which are con- 
spicuous onthe southern: bank......:..........- 44 505 
4. Bluish to light-gray, argillaceous shale which varies 
in thickness from 53 to 63 ft. Two ft. 4 in. below 
the top of the shale is a 33-in. layer of sandstone.... 6+ 5 
3. Sunbury shale—Thin, tough, even-layered black 
shale which is well shown in the narrow part of the 
glen. The measurements vary from 203 ft. to 263 ft. 
Specimens of Lingula melie Hall, Orbiculoidea new- 
berryi (Hall) Herrick and fish scales occur about 33 
in. above its base and again abundantly at a horizon 
4 ft. 8 in. above the base, near the top of the shale 
bank overlying the last outcrop of the Berea in going 
TEND), GREE Tala) GORE SU epee eases Se Ae 203+ AQ 
2. Berea grit.—Rather coarse-grained, quartz sandstone 
which on the weathered surface is much stained, 
rusty, brownish or even blackish. The upper part 
contains much marcasite, so that the weathered top 
surface is pitted and rough, while it is much dis- 
colored or blackened. The cliff on the eastern side 
Lot 
