elxxviii Journal of the Asiatic Society of Bengal. IN.S., XIV, 
4. The Lower tertiary fresh-water stage is followed by 
shallow marine conditions during the deposition 
of the Upper Chharat stage. 
5. The region emerged finally from the sea and was 
subject to erosion. 
6. The fluvio-lacustrine Upper tertiary rocks were laid 
down unconformably on the limestones, at first ina 
trough along the foot of the northern hills. 
7. In Siwalik times the area of deposition spread south- 
wards to beyond the line of the Salt Range. 
The Oil-Seepages. 
We can now pass to a consideration of the conditions 
under which the oil-seepages occur with a view to determining 
what horizons are likely to be oil-bearing. 
The Foot-Hills Oil Zone. 
There is a well-defined zone of seepages along the foot-hills 
of the Margala and Kala Chitta ranges which might be 
described as the “foot-hills oil-belt.” This zone stretches 
crystals of native sulphur can be obtained from the oil-soake™ 
limestones and shales. The im mediately overlying beds cont 
abundant gypsum. : 
The Chharat fold, about twenty miles west of Golra, is the 
largest limestone anticline of the Kala Chitta foot-hills; #® 
steeply compressed and over-folded to the south. Seepages 
humerous and not all at the same horizon. The main seepae” 4 
are at the same horizon as the Golra seepages—the passage 
