338 vans on the Oil-producing uplift of W. Virginia. 
face; but the inner (or lower) strata of the slopes conduct to 
erevices still covered by a mass of horizontal rock, where oil is 
now found. 
The surface rocks of the country adjacent to this uplift, on 
either side, are well known to be those of the Upper Coal-meas- 
ures. The lowest rocks brought to the surface by the upheaval 
are undoubtedly those of the Lower Coal-measures. ‘This is in- 
dicated by the occasional appearance of Lepidodendra. In the 
hills between the slopes there are three or four veins of coal, 
and their equivalents are found in the inner strata of the slopes; 
but where the upheaval has been greatest, I think only two 
seams have been detected in wells sunk in the valleys ;—those 
been penetrated a great distance. This may be the Lower Sub- 
carboniferous (or Vespertine); or, as from data furnished by 
Rogers we may infer that the latter is but slightly developed 
in this region, and may be represented by the thin conglome- 
rates just mentioned, it is probable that the sandstone belongs 
to the Chemung group, overlying the black shales, and consti- 
tuting the geological horizon of most of the oil obtained in 
Pennsylvania. 
The opinion has been expressed, in this Journal, that a well 
860 feet deep, put down near the middle of the inner belt, in 
the neighborhood which we are considering, and at a point 
where it is represented that a depth of about 1000 feet from the 
than they are estimated, in the Ohio reports, to be in the neigh- 
boring counties to the northwest of the Ohio river. This is in 
a 
: 
3 
bs 
a 
