PETROLEUM RESOURCES—LEVORSEN 
100 MILES 
— After Imlay-Halbouty 
Ficure 11.—Wedge-shaped Lower Cretaceous and Jurassic sediments of southern Arkansas 
and northern Louisiana which provide the regional location for more than 125 oil and 
gas pools. 
N 
SEA- LEVEL — 
S000 FT 
10,000 FT 
15,000 FT — 
=a joitoO MILES == 
SUNNILAND 
OIL FIELD S 
ae ee 
(“T__ LIU. Cretaceous 
al ie ed 
— After Pressler 
Ficure 12.—Same wedge-shaped cross section of lower Cretaceous and Jurassic sediments 
(see fig. 11) extends into Florida where it has been found productive at Sunniland. 
changes in facies will occur in these 
rocks, but their past history in 
Louisiana and Arkansas gives some 
indication of the possibilities. The 
scale, both lateral and vertical, is so 
great that here, again, if production 
is found, we can expect it to be sub- 
stantial in terms of national needs. 
Ideas on where to drill come from 
many sources. ‘The farther away from 
present production we search, the 
more we depend on sources outside the 
petroleum industry for our basic data. 
One such source is the great wealth of 
geologic data in the publications of our 
science and particularly in the publi- 
