330 CHARLES S. PROSSER 
Zone No. 1 of the above section is believed to be the continuation 
of the black shale at the top of the Milan section (zone No. 13 of 
that section), but somewhat higher stratigraphically and showing 
the horizon with spherical concretions which is probably strati- 
graphically higher than the exposed black shale at the top of the 
Milan section. Above this zone of rather thick black shale occur 
alternating zones of blue and black shale which have a considerable 
total thickness. The next three sections measured in ascending the 
river, one on the Will Hipteley farm on the eastern side and two on 
the western side on the Fred Heckelman and Mrs. Helen Andrews 
farms, do not add very much to the general section of the Huron 
River; consequently they will be omitted in this article. They are 
important, however, in tracing the zones shown in the McGue 
section up the river to the section at Enterprise which will now 
be described. 
Enterprise section.—A steep cliff forms the western bank of the 
Huron River’ at the former hamlet of Enterprise below the P. J. 
Schaffer bridge. The bank is difficult to climb but the following 
section was measured just below the William H. Newton house by 
Mr. Tom G. Roderick: 
SECTION OF WESTERN BANK OF HURON RIVER AT ENTERPRISE 
TorTaL 
THICKNESS 
Ft. In. Ke In. 
21. Black, hard, bituminous, fissile shale which 
projects beyond the lower shales as exposed to 
the north of the middle of this bank. Thick- 
hess estimated as rom! sto Ont es see ae BAR se 60 
20. Mainly blue, argillaceous shale; but with some 
layers of black shale from 1 to 3 in. thick. On 
the high bank on the opposite side of the river, 
above the Schaffer bridge, disk-shaped con- 
cretions occur at about the top of this zone.... 32 6 54 ) 
EO: Black ishratle e940 ra err eee eerie 3 al 22 3 
No. THICKNESS 
t One and three-fourths miles above the Milan River bridge are the forks of the 
Huron River, which are named West Fork and East Fork on the Sandusky quadrangle 
of the topographic map. The West Fork is the larger, and in accordance with the 
usage of Dr. Newberry and at least many of the inhabitants of that region the writer 
considers the West Fork the continuation of the Huron River and so uses it in this 
article. 
