474 ADAMS AND PRATT. 



River which reaches the coast between Catanauan and Mulanay, where 

 a pole or bar is sunk into the water and causes oil to rise to the surface 

 and flow do-mi the stream, forming patches which are distinctly "visible. 

 At this place, mining locations had been made recently. The second 

 locality where oil-seeps were seen is in the valley of the Vigo River. 

 The oil accompanied by some gas rises to the surface when a bar is 

 thrust into the bed of the stream, and this fact led to the drilling of 

 a shallow well near by, by which mean? some oil was encountered. There 

 are several similar seeps in this valley. These have not been prospected. 

 Ils'early the entire valley of the Vigo River has been staked as oil claims. 



There is a place on the Bahay River where at any time the oil may be 

 seen rising to the surface of the water and floating down the stream, and 

 close to this point there is a well about 35 meters deep in which a fair 

 showing of the oil was encountered. The valley of the Bahay River is 

 likewise staked as oil claims. Seeps and small gas vents are known at 

 many other places, so that the territory which may be prospected is large ; 

 in fact the whole peninsula is worthy of investigation. 



The study of the geologic formation demonstrated that the peninsula 

 is anticlinical in structure. However, it should not be Inferred that it 

 is a perfect anticline, but rather a grand upward flexing of the sand- 

 stones, shales, and limestones of Tertiary age which has resulted in some 

 places in faulting and a repetition of the beds. The shales are in part 

 highly carbonaceous and the sandstones are suitable as reservoirs for oil 

 and gas. The total thickness of the beds undoubtedly will aggregate 

 more than 1,000 meters. The higher formations in general are the 

 limestones which foi*m ridges running from northwest to southeast with 

 the trend of the peninsula. The sandstones and shales outcrop in the 

 intermediate areas. There are many good exposures along the beds of 

 the streams and in some cases on the higher slopes, but the ridges are 

 covered with timber and the rolling country with cogon grass, so that it 

 would require careful study to work out the details of the structure. 

 In some cases the dip of the beds is 45° or more. Aside from looking 

 for showings of gas and oil, the prospector should study the dip of the 

 rocks and find an area where the beds dip at relatively low angles in 

 order to have favorable conditions for the development of the field by 

 drilling. 



Transportation to Tayabas Peninsula is not difficult, although it is 

 rather indirect. At present a contract steamship calls at Catanauan 

 at intervals of ten days and there are several freight vessels which 

 stop irregularly at this and other ports. The trails are suitable for 

 foot travel during the dry weather. During the rainy season it would 

 be well to use carabaos, and usually these can be obtained without much 

 difficulty. From Catanauan the peninsula may be crossed by trail to 

 San Narciso, but the easier route for visiting the prospects above men- 



