88 



ADAMS. 



illustration (fig. 6) which is taken from a map accompanying his report, 

 and which describes them in detail. Most of the solfataras are in the 

 nature of hot mnd spots, from which emanate more or less boiling water 

 and steam. Their action has converted the surrounding rocks into, a 

 white earth similar to kaolin and deposits of this earth are also found 

 on the slopes of the mountains at places where solfataric action has 

 ceased. The most important evidence of volcanic activity near the base 

 of Maquiling is the crater lake called Laguna de los Caimanes which 

 probably occupies the crater of an extinct cinder cone. It lies on the 

 border of Lake Bay just to the west of Los Banos and by some author- 



B A Y LAKE 



Cs Calambal. 

 imba 



IE 

 s 



LEGEND 

 ^iDolerites I I Tuff and lapilli 



Solfataras T Thermal springs 



SCALE 



Fig. 6. — Sketch Map of the Geology and Topography of Mount Maquiling 

 and the Surrounding Country, as Mapped by Abella. 



ities is described as an island. It appears that during the dry season 

 a crossing on dry land to this crater-lake is feasible by avoiding the 

 hot springs which intervene between it and the mainland. During the 

 rainy season the rise in level of Lake Bay converts the cinder cone into 

 an island. A small hill, Pansol, to the west, at the base of which 

 issue hot springs, and a hill to the east on Point Ma3 r ondon, are probably 

 remnants of other cinder cones. A small, low hill called Cerro de la 

 Mesa is seen when traveling from Calamba to Los Bahos by wagon 

 road, to the northwest of Maquiling. This appeared upon examina- 

 tion to be a small cinder cone preserving some signs of a crater. Sur- 



