Waverly Formations of Central Ohio. — Prosscr. 2)A7 
the creek a few rods below where the top of ^ 
the gray shale is seen in the stream's bed. 
Sunbiiry shale. Thin, black, laminated shale. 26' 3.^' 
The contact of the gray shale at the base of 
the Cuyahoga is beautifully shown in the bed 
of the stream with an inch layer of mottled, 
black shale, the mottling due to cylindrical 
ramose, infilling of gray material similar in ap- 
pearance to the gray shale above. The line 
of contact between the gray and black shale is 
perfectly distinct and sharp. The base of the 
black shale is in contact with the subjacent 
sandstone, the lowest layer of which is arena- 
ceous, strongly pyritiferous and contains Lin- ^ 
gala mclic Hall, which is common, Lingiila 
sp. and plants. On tlie s.outhern bank 
c\ the stream a little above the Berea 
ledge is a bank of Sunbury shale 22 feet high 
by tape measure, and the highest exposure of 
shale by hand level is 26 feet above the top of 
the Berea. The second exposure up the stream 
above the one just described, which is on the 
northern bank, shows 12 feet of Sunbury shale 
capped by 9 feet of shale and the latter by a 
sandstone. The base of this exposure by hand 
level is from 12 to 14 feet above the top of the 
Berea sandstone. A recent measurement of 
this shale by Mr. George F. Lamb gave 24 
feet 8 inches. 
Berea sandstone. Coarse, gritty, bluish sand- 6'± 7' 
stone in a single sitratum which varies in 
thickness from i to 6 feet. In the stream 
where the contact with the Sunbury shale 
occurs it is only a foot or a little more in 
thickness ; but on the bank 30 feet below it in- 
creases to 6 feet and then thins when followed 
a few yards down the stream to 2 or 3 feet. 
The upper part of the sandstone contains 
plenty of marcasite and its top surface is even, 
so that the irregularity is in the lower sur- ■ 
face. Other exposures in the vicinity show as 
great a thickness as 10 feet. 
Gray fine grained shale, iron-stained, contain- i-|-' i' 
ing occasionally lenticles of sandstone ; but in 
general a soft argillaceous shale which in 
places is nearly a clay. At this locality it 
varies in thickness, according to thickness of 
the Berea sandstone, from less than a foot to 5 
feet. 
