704 ON THE VOLCANO OF TAAL, 



Between Las Canas and Binintiang Munti there are only the 

 two elevations spoken of already as Mt. Tabaro and Mt. Saluyan ; 

 the rest of the plain is composed of slopes of ash, modified by 

 barrancos which have been due to weathering. 



Binintiang Munti. — This is a small ancient crater, so much 

 worn down by weathering as to be only about 50 or 60 ft. above 

 the level of the lake, and limited on its north-east and south-west 

 sides by two small ridges, which are the remains of what was once 

 the much more elevated rim of the crater. It has a depression in 

 the centre, and is of horse-shoe form, about 500 yards across at its 

 widest point. The slopes of this small cone terminate in the lake,, 

 with undulations on the surface giving rise to a number of small 

 points which alford excellent sections. These display in a very 

 complete manner the different strata which have arisen from 

 eruptions at various times. One sees that the crater is built up 

 of tufas and conglomerates of various colours and fineness, of very 

 distinct character. Senor Centeno gives a list of these various 

 deposits, but, on comparing his list with some of the sections 

 exposed, I found they were subject to gi^eat variation, even in the 

 space of a few yards ; that is as far as colour and consistency were 

 concerned. 



PiNAG Ulbuan. — It only remains to refer to one more of these 

 subsidiary cratex's. This is the one spoken of on the north-east 

 side of the island as Pinag Ulbuan. It is nearly circular, and 

 about 350 yards in diameter, surrounded on the north and west 

 sides with almost precipitous cliffs, and barred on the east by a 

 dyke between 20 and 25 ft. high, which dams the water, and gives 

 rise to the name of Pinag Ulbuan, which means in the Tagalo 

 dialect a deep reservoir. The highest points of this crater are on 

 the north-west and south-east sides, and are about 500 ft. and 

 400 ft. high respectively above the level of the lake. The aspect 

 of this crater is that of an amphitheatre broken down largely on 

 one side. There are good sections, which show the composition of 

 the slopes to be of ashes, scoriie and conglomerates, with volcanic 

 sand in strata of different colours. 



