HURON AND CLEVELAND SHALES OF NORTHERN OHIO 337 
eastern bank is steep and rather high. A section of this bank is 
as follows: 
SECTION OF SLATE RUN AT STANDARDSBURG 
THICK- 
NESS 
No. ss 
TOTAL 
THICK- 
NESS 
Ft. Bie 
2. Apparently all hard, black, slaty shale 22 ft. or more thick. 
No concretions occur in this bank; but farther up the stream 
where it is crossed by the north-and-south road there is a 
large spherical concretion in place in the shale and several 
aceunapove, thecreek level. fi. 225. see ceases te leces a 221-5 23 
1. Top of blue, slaty shale, which corresponds to zone No. 11 
of the previous section, about 1 ft. above water level. Blue 
shale with black shale below to creek level.............. I I 
In the bed of Huron River a short distance east of the mouth of 
Slate Run are large, somewhat lenticular concretions. On the 
northern bank of the river at this locality, which is opposite the 
house of Mr. Charles Burgel, from 15 to 18 ft. of hard, black shale 
are shown. 
SLATE RUN SECTIONS 
Sections near Pontiac.—On the Huron River to the south of 
Standardsburg and above the cliff just mentioned, the banks are 
mainly alluvial and drift. The shales are much better exposed 
along Slate Run, which is a southwestern tributary of Huron River, 
and this general section is continued up that run. 
The southern bank of Slate Run, at the north-and-south 
highway bridge and below the railroad at Pontiac, shows to ft. of 
hard, slaty, black shale and below the bridge the bank is higher, 
apparently showing from 12 to 15 ft. of black shale. The 
barometer, with an interval of 37 minutes between the readings, 
gave the level of Slate Run at this bridge as 25 ft. higher than its 
mouth at Standardsburg. This apparently shows that this black 
shale is a continuation of the zone forming the greater part of the 
cliff at the mouth of the run and is probably stratigraphically 
higher. 
Again, where the highway running directly west from Pontiac 
crosses Slate Run, black shale forms the floor of the stream above 
the bridge, and below it there is a bank 12 ft. high composed 
entirely of black shale. The barometer with an interval of 33 
minutes between the readings, gave Slate Run as 15 ft. higher than 
