X, A, 4 Pratt: Petrole^im and Residual Bitumens 247 



sions, distributed throughout the petroleum-bearing region, were 

 observed. 



The sedimentaries in northwestern Leyte are generally tilted 

 so as to have a strike of north 60° west with dips of from 10° 

 to 20° at right angles to this line in either direction ; locally the 

 strata have been thrown into sharper folds in which, however, 

 the general west-northwest strike is maintained. At places 

 along the coasts even the general strike is lost, and the attitude 

 of the beds is widely different over short distances. The more 

 intense folds are in the intruded areas and are probably accom- 

 panied by faulting. 



STRATIGRAPHY 



Table I shows the stratigraphy of the Tayabas petroleum 

 region as worked out by Pratt and Smith. *■■ As modified in the 

 following discussion, the table serves admirably for the Leyte 

 petroleum region, the correlation of the principal divisions being 

 perfect. 



ALLUVIAL AND LITTORAL DEPOSITS 



Alluvium is of minor occurrence in northwestern Leyte and 

 demands little attention. Sand and clay derived from the sed- 

 imentary rocks, with pebbles from the intrusives and coralline 

 limestones, border the lower courses of the streams. Raised 

 coral reefs are encountered along the coasts and indicate an 

 elevation of the land mass continuing into recent time. Frag- 

 mental coral and other littoral debris have been elevated with 

 the reefs, and the deposits have a roughly bedded structure in 

 which the dividing planes are frequently inclined at considerable 

 angles. 



M-VLUMBANG SERIES 



The Malumbang series has not been studied as closely in Leyte 

 as it has in Tayabas; in the last-named region it was found to 

 be nonuniform both in thickness and in character. An upper 

 and lower limestone with an intervening sandstone were found 

 at some places in Tayabas, but at other places the lower lime- 

 stone appeared to be missing, and the sections rarely included 

 all three divisions. In Leyte the series is similarly inconstant 

 in character. It can hardly be described more definitely than 

 as an irregular succession of calcareous beds, ranging from 

 chalky limestone through calcareous sandstone to coralline lime- 

 stone. The chalky beds are more prominent in Leyte than in 



" Op. cit., 312. 



1 34764 2 



