ILLUSTRATIONS 
PLATE 1 
Topography in vicinity of Pidatan oil seep. 
. Mount Kitubud (Pliocene limestone) and valley of the Malitabug. 
PLATE 2 
Pliocene shales on Malitabug River. 
. Fort Pikit on Pleistocene coral outlier in Cotabato Plain. 
TEXT FIGURES 
Outline map of Mindanao, showing the location of Pidatan oil seep. 
. Sketch map of the Pidatan district and areal distribution of for- 
mations. 
. Generalized cross-section of geology. 
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