HURON AND CLEVELAND SHALES OF NORTHERN OHIO 351 
Black River sections.—To the east of Vermilion River is Black 
River, which is also bordered by high banks for much of its course 
northward from Elyria. On the eastern bank of Black River on 
the farm of the late Mary L. Demeiner (formerly known as the 
D. W. Garfield farm) in the extreme southern part of Sheffield 
Township, 3? miles north of Elyria and 113 miles northeast of the 
Rugby section on Vermilion River, is a steep cliff where the fol- 
lowing section was measured. Its upper part is exposed by the 
northern side of the east-and-west highway a few rods below the 
Demeiner house. 
SECTION ON Brack RIVER ON DEMEINER FARM 
TOTAL 
THICKNESS 
Ft. In. Ft. In. 
No THICKNESS 
5. Bedford formation: Soft, rather mie 
argillaceous shale, 4 to 5 in. shown....... at Ag+ 71 a 
4. Dark-gray to blue, rather blocky shales con- 
taining the usual Bedford fauna. The fossils 
are most abundant in the upper part of the zone 
and Parallelodon hamiltoniae (Hall) is the most 
COMMMOMESMC CLES alas, Mente Mee ti sucttin Soe we ee I os 7I 2+ 
3. Soft, light-gray, argillaceous shale from 17 to 
Tiley. THD) (8 Le) AB Ae eu ae we eA ee I 6 690 5 
2. Coarse, blocky, dark-gray to blackish, arenace- 
ous shale containing some fossils, as Spirifer sp. 
EMM Ge ar OMUCLUSYS Dey Ste fts aks << «cde thine « 6s des ee II 67 II 
1. Cleveland shale: Slaty shale, apparently all 
black. From river level to base of Bedford 60 
ft. by barometer and 67 ft. as leveled by Mr. 
(Cloven el FaCy Sea Ie 16 | a eo 67 a4 67 
The 67 ft. of black shale in the above section all belong in the 
Cleveland and the base of the cliff apparently does not reach the 
top of the Huron or Chagrin shale. 
There are steep banks composed mainly of black shale on the 
sides of the big bend in the Black River east of South Lorain. On 
the northern side at the ‘‘gap”’ about 14 miles north of the Demeiner 
section the bank and outcrops on the highway are apparently all 
black shale and almost at the base is a calcareous lens 14 inches 
thick at the middle, with cone-in-cone structure. These shales 
contain immense numbers of Sporangites which may be collected 
