﻿390 SMITH. 



measures; to the east it dips beneath the limestone and still farther to 

 the east it undoubtedly would be found, although at no inconsiderable 

 depth. This belt of productive measures can readily be traced in a 

 general way by the topography and the vegetation. The topography is 

 marked by moderate, gentle slopes and rounded contours. The vegeta- 

 tion consists largely of rank cogon and talahib, with absolutely no 

 forests. 



Mount Licos is a long, irregular mountain the highest point of 

 which is just above the Compostela workings. Prom its height of 

 520 meters (1,700 feet) it declines gradually to the northeast to the 

 Danao Eiver. This eminence is capped with a white, orbitoidal limestone 

 of 30 to 150 meters (100 to 500 feet) in thickness. This capping is 

 very rugged, exceedingly conspicuous and easily traced; it is fairly well, 

 but not densely, clad with forest trees. To the north of the mountain we 

 find a great mass of conglomerate, not basal, but such a formation as is 

 characteristic of coal fields. I have called this the barren measures. Its 

 thickness is at least several hundred feet, although just how great it 

 is I am unable to say. Although it is treeless, it is marked by its 

 accentuated relief. This formation will be treated of more fully in a 

 subsequent portion of this paper. 



THE CAJUMAYJUSIAYAN VALLEY. 



Another field containing coal lies to the north of Sili Peak and 

 Lantauan ridge. This is simply an extension of those to the. south. Its 

 structure, to judge from rather incomplete data, is that of a basin or 

 syncline. Practically the same formations as those mentioned under the 

 Mount Licos region occur here and in the same order. The most 

 characteristic feature of the field is the hogback in the center of the 

 basin, which is a remnant of the upper or barren conglomerate. There 

 are five seams in this valley, as is the case in the others. 



Table III. — Utraiigrapliy of the Compostela-Danao region. 



Recent. Alluvial deposits in streams and extensive and thick talus on 



all slopes; and travertine. 



UNCONFORMITY. 



Miocene. Upper white limestone, coralline and containing Orbitoides, 



Lithothamnivm and many mollusca in its basal portion. 

 Oligocene. Shaly limestone — cream colored and soft — unfossiliferous. 



UNCONFORMITY. 



Extrusive rocks — chiefly andesite. 



Terrestrial deposits consisting largely of conglomerate — show- 

 ing much oxidation. 



UNCONFORMITY (?) 



Coarse gray sandstone. 

 Coal measure shales including five 

 coal seams. 



Eocene. 



90 to 150 meters (300 

 to 500 feet.) 



