“4 
Mineralogy and Geology. 353 
inthe two regions are rather in degree than kind; and the advantages are 
_ gitat mass of it. And, in the abundance of gas emitted from the under- 
lying rocks, the Enniskillen region bears a very unequal comparison. 
tis quite possible that no porous stratum will be found in Michigan 
_ Mposing upon the surface of the rock, Its occurrence is accidental any- 
were, Should it be found wanting, and “surface oil” consequently 
_ Wanting, this fact would not have the slightest bearing on the probability 
_ of oil in the rocks below. 
Thave stated that the Huron group, or Oil formation, extends contin- 
wously from the peninsula of Michigan into the peninsula of Canada 
_ Mest. To embrace both regions under one designation, they might be 
ate of as the Peninsula Oil Region. It is not to be imagined that 
‘will certainly be obtained at all points within this region. It may be, 
t probably will not. Slight undulations are liable to exist in all strata 
% nearly horizontal as those of the two peninsulas, The volatile ema- 
hations from the strata would therefore accumulate under the highest 
arches, Possibly one of these arches runs nearly north and south through 
ther underlies the district. of petroleum manifestations on the Michigan 
Side of the river. For the present, it would be safest to confine large ex- 
aeeumulate along geological axes, and become restricted to belts of 
tountry of limited width. 
bites, and various Mollusks. The following important remarks on the 
4g@ of the Galt or Guelph limestone of Canada, aud Leclaire beds of 
we ; . 
nthe same referen i i been made during the Geological 
ave ce of species had in fact been i 
Day and they were thue published in the Report on the Fourth Geological 
In 
