PETROLEUM RESOURCES—LEVORSEN 
including the Hunton limestone, the 
Viola limestone, the Simpson sands, 
and the Arbuckle limestone, all of 
which are richly productive in the 
important Oklahoma oil fields 25 to 
75 miles to the west and northwest. 
Moreover, above the area of this fold 
and within the faulted overthrust 
rocks are found a large number of oil 
S SOUTH MOUNTAIN 
249 
belief that, if productive, it will be 
large—in other words, here is one 
area possibly containing an unex- 
plored trap a dozen times as large as 
the Oklahoma City field! 
The recent discovery of oil at Rose 
Hill in Virginia (fig. 5) located in the 
overthrust Appalachian region directs 
attention to a large area of complex 
Eocene Miles 
Ficure 4.—Section through the South Mountain oil field in Ventura County, Calif. (After 
Bailey.) 
ROSE HILL 
OIL FIELD 
—_—- 
12 MILES 
Wallen Valley 
Foult 
FicureE 5.—Section through the Rose Hill oil field in western Virginia. Production is 
found in sediments of Trenton (Ordovician) age below the Pine Mountain overthrust 
fault. (After Miller and Fuller.) 
and gas seepages, asphalt deposits, 
and other evidences of petroleum. 
The anticline perhaps differs some- 
what from that shown in the section 
due to the rapid thickening of the 
Pennsylvanian sediments toward the 
southeast, but even so there is un- 
doubtedly a fold of some sort in the 
early rocks at this locality. It is of a 
size and proportion to justify the 
geology which has heretofore been 
greatly discounted because of the high 
carbon ratios expected. The oil pool 
is found in dolomites of Trenton age 
where overridden by early Ordovician 
and Cambrian rocks. In addition to 
the oil at Rose Hill, gas has been 
found in the overthrust belt at Early 
and Bristol, both in Virginia. Source 
rocks consequently have been demon- 
