272 FANNING. 
that in the area examined none exists. The sedimentaries can 
be found to an elevation of at least 100 meters, and the uplift 
probably was not much greater. This small uplift is in contrast 
with the position of correlative beds in the Central Cordillera 
of Luzon where elevations of 1,600 meters occur. The upheaval 
of Pangasinan and the Zambales Mountains is still taking place 
as proved by uplifted recent coral. 
Alluvials.—Alluvials are found in the hills only to a limited ex- 
tent, as the stream erosion does not permit the formation of thick 
beds. The base-level valleys, as around Alaminos, are covered 
by beds of river silt, due to the periodic floods. 
SUPPOSED LOCATION 
of the 
Marshall Group. 
Scale 3cm.= 300m. 
Fic. 2.—Supposed location of the Marshall group. 
ECONOMIC GEOLOGY. 
ORE DEPOSITS. 
Gold.—The region exhibits few of the features characteristic 
of gold deposits. Quartz veins are seldom seen, placers seem 
absent, and the rivers pan only the minutest traces of gold. 
Natives have done no mining worthy of mention, and for the 
Philippines this is strong confirmation of the nonexistence of 
ore deposits. 
The major portion of the region is covered with a considerable 
