286 ^^6 Philippine Journal of Science 



similar limestone at this horizon was not detected at Toledo. 

 Placing this limestone in the eastern limb of the fold implies 

 faulting in the plane of the anticlinal axis with an accompanying 

 elevation of the eastern limb. 



The petroleum seep at Malbog appears to be at a higher 

 stratigraphic position than the oil encountered by the wells at 

 Toledo; possibly, therefore, petroleum-bearing rocks at Malbog 

 exist, a horizon lower than the seep, and petroleum migrates 

 upward through the broken strata in the crest of the anticline. 



The possibility of obtaining petroleum in quantity at Malbog 

 could best be tested by drilling a series of wells along a west- 

 northwest line across the crest of the fold. The structure ap- 

 pears to be favorable except that the anticline is rather sharp, 

 and the presence of petroleum is demonstrated by the seepage, 

 although there is no data as to the probable quantity. The 

 vicinity of the Malbog seep is difficult of access; the narrow 

 valley and the steep gradient of the creek, together with the 

 elevation to be attained, would make transportation difficult and 

 expensive. 



