332 CHARLES S. PROSSER 
Farther up the river near the township line of Oxford Township 
on the Joe Schlacter farm is another cliff on the western bank of 
the Huron River showing practically a section of the same portion 
of the Huron shale as the one just described at Enterprise. Very 
near the base of the section is an 8-ft. zone of black fissile shale 
containing spherical concretions, which apparently corresponds to 
zone No. 5 of the Enterprise section, which is 7 ft. 103 in. thick. 
Above this black shale in the Schlacter cliff are alternating strata 
of blue and black shales with a total thickness of 44 ft., when a 
zone of black shale capping the cliff is reached, 8 ft. or more of 
which are shown. The corresponding interval between the two 
conspicuous zones of black shale in the Enterprise section has a 
thickness of 43 ft. 103 in. 
Seymour Creek section.—The zone of black shale, the lower part 
of which caps the cliff at Schlacter’s and Enterprise, is better shown 
on Seymour Creek just north of the schoolhouse of Subdistrict 
No. 6 of Ridgefield Township. 
SECTION OF SEYMOUR CREEK NEAR SCHOOLHOUSE NO. 6 
TOTAL 
Tees THICK- 
No. NESS 
Ft Ft. 
2. Black, bituminous, fissile, hard slaty shale. A large 
globular or spherical concretion is imbedded in this shale, 
the base of which is about 13 ft. above the base of this zone. 
The top of this zone is not shown, but 243 ft. of the black 
shaleiwere measured onsthebanken vane s eeeeeee 243+ 52% 
1. Blue shale alternating with thin bands of black shale. In 
the upper part of the blue shale are numerous large concre- 
tions which are lenticular or disk-shaped. There are from 
8 to 10 in the vicinity of the bend in the creek and one in the 
stream is 5 {t. 8 in. by 5 ft. 6 in. A twin one on the bank 
is 11 ft. long by 6 ft. wide. Five+ ft. of this zone are 
shown at this locality and from its top down to the bridge 
on the lower road there are shown about 28 ft. of the 
alternating blue and black shales according to a measure- 
ment bys Professors ely ders sak irae eee 28 28 
This section is shown in Fig. 3, in which the man is indicating ~ 
with the hammer the contact of the black shale (zone No. 2) which 
forms the upper part of the bank, and blue shale with thin bands of 
