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368 GEOLOGY OF OHIO. 
Harrisville is one of the townships in which the water “divides” to 
the Ohio River and Lake Hrie. The great marsh is drained in both di- 
rections, and is much lower than most of the land along the ‘‘divide.” 
The Cuyahoga shale is very finely exposed north of the village of Lodi, 
many rods of abrupt river-bluff offering superior sections of this forma- 
tion. Lime is quite rare in the rock here, and iron concretions are not 
as abundant as in some of the exposures of this shale in Medina. Fossils 
in the soft shale are numerous, though difficult to preserve. Brachiopods 
and bryozoan corals abound, and occasionally a crinoid or a trilobite may 
be found. | 
Quarrying has been carried on since 1840 in numerous places along 
Whetstone Creek, a mile south-east of Lodi. The rock is chiefly an argil- 
laceous sandstone, most of the beds being only a few inches thick, and 
the thickest not twenty inches. The exposures here are twenty-five to 
thirty feet high Large crevices run through all the rock, which is badly 
broken up. Many layers show something of a micaceous nature, and one 
of an inch in thickness splits into thinly-laminated sheets of large size. 
Above theshale isa deposit of Drift-conglomerate but slightly cemented 
together. This bed is four to five feet thick, and when cut into, usually 
stands up against the weather, though in places it falls away verv quick- 
ly. Large masses may be found in the ravine where they have stood 
years of washing, and yet seem very compact and hard to break up. This 
deposit of Conglomerate is largely made up of stones of the size of CLS, 
and some are even large enough to weigh two pounds. 
One mile west of Bridgeport, the town just across the county line in 
Wayne, there is a large quarry on the south side of the Killbuck River. 
At this exposure the rock lies in thicker beds than it does along the 
Whetstone Creek. I found in this quarry a large fish spine (Gyracanthus 
compressus), also an abundance of fossil shells (Productus). 
Travertine is being deposited in a lotowned by Col. Robert English. It 
is a mile from Lodi by the north-east road.. Some of the masses are large, 
and they are quite numerous about the spring which issues from a hill- 
side. | 
The largest bowlder in Ohio, with possibly one or two exceptions, may be 
seen in a field at the cross-roads, one mile and a half north of Lodi, and 
a little east. This mass of erratic rock is that variety of granite called 
syenite. The feldspar in this is dark flesh colored. These masses are of 
metamorphic rock, unknown in Ohio except as bowlders. Like all such 
granitic bowlders, these are fragments of Canadian rocks which were 
broken from the hills and ledges where they belonged, and brought to 
the south either by the great glaciers which once ground down the whole 
