HURON AND CLEVELAND SHALES OF NORTHERN OHIO 333 
black which forms the lower part. Two of the characteristic 
lenticular-shaped concretions of the soft blue shale are shown a 
little above water level. 
The upper black shale, zone No. 2 of the above section, may 
be followed up the Huron River to Monroeville, where its top 
apparently is reached on the bank above the dam and the Main 
Street bridge; but the writer is not so certain of this identification 
Fic. 3.—Black and blue Huron shales on Seymour Creek, the contact indicated 
by hammer. Spherical concretion in lower part of black shale and lenticular concre- 
tions in blue soft shale near water level. 
as of that of most of the other zones of this general section. At this 
locality stems of Calamites (Pseudobornia | ?]) are not infrequent in 
the black shale of this zone below the Main Street bridge. 
Sections in Monroeville and vicinity.—There is a shale bank on 
the northern side of the Huron River between the dam and Stand 
Pipe and below the Lake Shore Electric Ry. bridge. The bank 
was measured near the house of Mr. Rivere Needham, where the 
following section was obtained: 
