STATE GEOLOGIST. | 93 
shot with 120 quarts of nitro-glycerine, and oil began flowing at once. 
Tanks had not been provided, and the oil wasted for five hours. The first 
tank completed had a capacity of 250 barrels, and was filled in one hour 
and fifteen minutes. Then again the oil ran into the creek, and wasted. 
Seven hours later adequate tankage was provided. The well flowed during 
12 days. In June, 1902, its production was 14 barrels per day. Other 
wells were at once begun in this vicinity, but all were small or failures; 
the second one, located about 500 feet from the “Klondyke,” started at 3 
barrels, and was abandoned one month later. The “Klondyke” gave the 
territory great advertising, and as a result wells were rapidly drilled. In 
1902 work was being done at several localities, but no important additions 
were discovered. 
Jerusalem Township.—The producing territory in this township is 
small. In sections 4 and 33 a small pool is found. Its length is about 2 
miles and its maximum width less than one-half mile. A small pool crosses 
the southwest corner of section 9, extending southeast into Ottawa county, 
and northwest into section 8 of Oregon township, Lucas county. Imme- 
diately north of the west end of this pool another small one is found. It 
occupies parts of sections 4 and 9 of Jerusalem township and 5 and 8 of 
Oregon. From what has been said it is evident that the production of oil 
in this township is very small. 
GEOLOGY OF THE COUNTY. © 
The topography is as flat and as uniform as is found in any county of 
the state. Along the lake ‘shore there are extensive marshes, some of 
which have recently been drained, bidding fair to make excellent farming 
territory. The surface rocks in the eastern part of the county are prin- 
cipally Lower Helderberg, but the geological map of the state shows a 
narrow belt of the Niagara extending due north from Geneva to the lake, 
which is reached at Cedar Point. This belt, as sketched, lies east of the 
principal oil territory. The western part of the county has as surface 
rocks the Lower Helderberg and Corniferous limestones and the Ohio 
shales. 
The Oil-rock.—The Trenton in the producing territory of the east- 
ern half of the county lies from 740 to 800 feet below sea level. It is very 
unusual that oil is found at such depths in northwestern Ohio. The rock 
lies highest over the low fold which brings the Niagara to the surface. 
From that belt the Trenton dips east and west, and at the same time to the 
north, the greatest depth having been reported along the lake shore. 
Asa rule the oil-rock is penetrated 50 feet. Sometimes the oil is found 
at the top, but usually it lies below the so-called cap-rock. Shooting 
nearly always helps the wells; charges used range in size from 60 to 300 
quarts. 
