Evans on the Oil-producing uplift of W. Virginia. 341 
ures. A deep well near the railroad, in the middle segment, 
which has penetrated over 100 feet into the probable equivalents 
of the main oil rocks of Pennsylvania, yields, from the bottom, 
an immense quantity of carburetted hydrogen but no petroleum. 
On this as well as other anticlinals in this region, burning 
Springs are of quite common occurrence, but they are in most 
cases locally associated with light oil. Many of the wells from 
to afford an extensive system of vertical fissures, would seem to 
be one of the determining characters of the main oil rocks. This 
feature belongs to several of the coarse sandstones of the Coal- 
measures; but it is most conspicuously seen in the conglomerate — 
Am. Jour. Sc1.—Szconp Serres, Vou. XLII, No. 126.—Nov., 1866. eee 
