96 



ADAMS. 



Centeno has also published a partial mapping of the tuff deposit (fig. 8) 

 which for the most part corresponds with the largest area shown on 

 A-'on Drasche's map, but continuing further to the north. In the map 

 accompanying this report andesite tuff and diorite tuff as distinguished 



Tuff 



Fig. 8. 



-Sketch of the Totaceous Akea of Taal Volcano, as Mapped 

 by Centeno. 



by Von Drasche are included in one general area. The area of trachyte 

 tuff mapped by him in the central valley is here shown as alluvium. 



Taal Volcano has been thought by some to be the origin of the greater 

 part of the tuff, but, as Becker has pointed out, there is reason to believe 

 that it may have been derived from many sources and been gradually 



