34 E. B. Andrews on Petroleum in its Geological Relations. 
If they have any surface outlets, Hi which the more a 
feet, another fissure Flag an abundant supply of oil of OTR. 
ence, while, as a general rule, oil found near the surface is 
heavy, the fissures sistant it being more likely to have sur- 
face outlets, yet sometimes the ver y deep fissures may have such 
outlets, and the contained oil be heavy. 
e West Virginia oil field presents many points of great sci- 
entific interest. All the seodlicaua oil wells in this part of the 
State group themselves along the anticlinal line marked out in 
the article referred to, this line being the one of the greatest 
fissuring of the roc cks. Toward its northern and southern ex- 
tremities this line presents the form of a simple anticlinal with 
the rocks so a on either side of the axis at angles varying 
from 5° to But in the middle part there is a double frac- 
ture, the: fines of dislocation inclosing a somewhat elliptical- 
shaped area about ten miles long by one wide. ese figures 
are only proximate estimates, A bird’s-eye view would present 
an appearance somewhat like that given in fig. 1. The more 
important oil oe ais are indicated by the marks , 
A, A represent the horizontal rocks. These belong to the 
highest strata of the Coal-measures. B,B represent the dislo- 
cated strata, inclining in opposite directions at angles varying 
