THE PHILIPPINE 



Journal of Science 



A. Chemical and Geological Sciences 

 AND THE Industries 



Vol. VI OCTOBEE, 1911 No. 5 



GEOLOGICAL RECONNAISSANCE OF MINDANAO AND 

 -SULU: III. GENERAL AND ECONOMIC GEOLOGY. 



By Waeeen D. Smith. 

 {From the Division of Mines, Bureau of Science, Manila, P. I.) 



CONTENTS. 





I. Genebal Considerations. 





Provisional sti-atigraphic scheme. 





:i. Districts: 





Zamboanga. 



Apo. 



Malindang. 



Agusan 



Lanao. 



Surigao. 



Cotabato. 



Cagayan. 



Tiruray. Sulu. 



I. GENERAL CONSIDERATIONS. 



I discussed in Chapter II ^ the physiography of Mindanao by units, 

 lakes, plains, etc. In this number I shall treat of the geology by districts 

 which more or less closely conform to the political divisions, reviewing 

 briefly in each case the various physiographic features. 



Geologically, Mindanao is to be considered a part of the great chain 

 of outliers of the ancient Australasian continent, a part of the crumpled 

 continental shelf. As it is situated at the very edge of that shelf, the 

 formations which appear at the surface to-day would of course be of 



^This Journal, Sec. A (1910), 5, 345. 

 105046 359 



