1049 
HANGING VALLEYS. 
The phenomenon of hanging valleys is not by any means common in 
Cebu, but there are two or three quite remarkable examples. One is 
found on the west coast, in the vicinity of Barili, where there is a 
beautiful waterfall of about 50 meters, and another, much more typical, in 
the Guila-Guila country where the Bocanit drops off the upland country 
into the valley of the Mananga, some 250 feet below. (See Pl. IV.) 
The outcrop near the top of the wall is a limestone, very rich in Orbitoides. 
The underlying rock is igneous; although the higher valley is still 
young, there is a marked difference between the cross sections of the two, 
the upper one being more on the order shown by fig. 1. 
REG Le 
The lower one is a typical cafion, and is diagramatically sketched in 
fig. 2. 
IG 2. 
We need not believe in any unusual series of events, other than a 
rather rapid rate of elevation, to explain this phenomenon. Evidences 
of elevation are abundant throughout the whole length of Cebu, as has 
been pointed out by Becker, Abella, and others. 
Another factor might be suggested as having played some part in 
producing the great difference in these two valleys, namely, the quantity 
of water available for the work of erosion on the plateau and in the 
