370 Scientific Intelligence. 
In a paper read to this Association last year, I showed that the 
Niagara limestone at Chicago holds impri 
where the first two formations come together, and according to 
Professor Cox, where exposed at North Vernon, Indiana, are both 
equivalent of the Genesee slates, 50 feet. Beneath this, at 4 
depth of twenty-five feet, in the underlying Corniferous limestone, 
ith. 
of 2,000 feet, but no traces of oil were met with. 
is_ locality, on the Wabash river, is, according to Prof. Cox, 
on the line of a gentle anticlinal or uplift which is traced a nie 
distance to the west of south. The relation of productive oil we . 
to such anticlinals was pointed out by Prof. Andrews and by my 
in 1861, 
- 
iptum.—In a note in this Journal for Beptenibes 
ous rocks.” It would have given a more correct jdea of my views, 
had he cited the words preceding; after maintaining that a primer 
pal source of the petroleum is in lower rocks, in fact the ime 
= lagara and Corniferous formations, I added: “ eee 
however, reason to believe, as I have elsewhere pointed out, t f 
much of the petroleum, ete.” I there referred to the Geology P. 
Canada, 1863-66, page 24, where I cite from two papers of 1 * 
S esley (Amer. Phil. Society, x, 33, 187), and it is from the evr 
_ dence there Siven by him, and not upon my own observations, 
SIA Rae gre (eo eM, 7 
eM a jt Bead yeast El tag stig ae ed | 4 
