170 7. Sterry Hunt on the Chemical and Geological History, etc. 
surf: - and often rising above it, constituting the flowing wells. 
These oil-bearing veins are met with at depths varying from 
leew feet to one and two hundred feet in the rock, and in 
borings near together the oil is often met with at very unequal 
depths. Ac djacent borings sometimes appear to be connected 
with the same vein, and to affect each slier's s supply. The 
deepest well in this region was estimated to yield, when first 
ieisaloy 2000 gallons : = — and at ie: ‘ot 
in this region seem to cet that these veins are denies vonnil 
obliquely “downwards to the great reservoir of petroleum which 
is probably i in the underlying Corniferous limestone. The 01 
wells in this township are confined to two districts, the more 
abundant one being about six miles south of the other. rom 
the results of an unsuccessful boring made on an intermediate 
oint, it appears oe these wate districts are on two slight ood 
than water accumulates in porous strata, or in fissures 
higher part of the anticlinal, and in obedience to a hydrostati¢ 
law, rises through openings to heights considerably above the 
water-level of the r region. arge quantities of hght carburetted 
ydrogen gas are found i in —— Paleozoic rocks 0 the vi i 
the latter in alle that have reste for some time wrought. | I 
do not conceive that the gas has any aetias pee wi 
the oil, since large quantities of it are foun ocks whieh 
underlie the Corniferous limestone. If however as is not im- 
probable, portions of it were generated, and now exist in a con 
Sense state in the oil-bearing — a elasticity would help 
to raise the petroleum to the surf 
The accumulation of the petstlonil along lines of uplift, and 
its escape through the fissures accompanying this disturbance, 
must evidently date from a remote geological epoch. Porous 
beds, like the Devonian sandstones, or the Quaternary gravels, 
have however served as reservoirs in which the oil has accumt 
lated, while argillaceous and nearly impervious strata, like # 
marls of the Hamilton group, and the fresh-water clays whieh 
overlie the gravels in western Canada, have in a grea 
ted its 
prevent escape. Hence, it would — that the Devons 
of Pasoniicinis, and northeastern Ohio are filled 
es 
with oil, which has risen from the Gislone beneath, aeethi axes 
