346 AIJAMS. 



noted a eonglomerate on the beacli about a half mile north of Alinena, the 

 boulders of which are enenisted with deposit of aluminous sulphate, 

 ])]'ohalily alunogeii, but of no coiniuei'eial importance. In addition he 

 JX'fers to a hot spring near t'atinon with a temperatuie of 10? F. and 

 containing a small amount of gas, hut no sulphur. 



Springs: Besides the springs already mentioned as associated witii the 

 solfataras on Biliran Island and near Buraucn in Leyte and those related 

 to the extinct volcanoes, Mount Amandiuing and Mount Cahah'an, there 

 is a small kot spring on the west side of the point of land which projects 

 from Leyte opposite Poro Island in tlie Biliran strait and a hot sul])liur 

 spring on Mount Ogris south of Mount Xij^ga between Ahuyog and Bay- 

 bay. South of Abuyog in the barrio Buenavista there is a cold mineral 

 spring. To the west of Alangalang, on the we.st side of the Cabayong 

 River, there are some small and apparently nearly buried hills which are 

 f)robably outliers of the Cordillera and at the base of one of these there 

 is a cold mineral spring. 



Igiieous rochs." — The rocks from the Cordillera which were collected 

 by Jagor, were studied by Eoth who states that there is an ami3hil)olitic 

 andesite at the gateway of the mountain of Dagami. Evidently he refers 

 to the gateway in the mountain Himalicagan which Jagor pa.ssed on his 

 way to the solfataras south of Burauen, since on Coellos map the names 

 Dagami and Burauen are transposed. Both, in his comments, states 

 that the rock is exacty like that of Isarog, a dormant volcano in Camarines 

 Sur, and that to the north of it there is a lapilli formation. This would 

 seem tCi be a proof that there was once an active volcano near by and 

 would support Jagor's statement that the solfataras are in a crater. In 

 another portion of his article Roth writes that it is well known that 

 Mount Dagami (Himalicagan) is an extinct volcano. Goodnwn found 

 andesites at a locality near the solfatara. 



According to Becker's opinion Abella's descriptions of the rocks of 

 Biliran Island make it substantially certain that they are hornblende 

 andesites. 



The rocks which the streams bring down to the vicinities of Alangalang, 

 Dagami, and Cabalian and which were collected during the reconnaissance 

 on which this report is based, were mostly liornblende andesites with a 

 few liasaltic boulders. 



One of Roth's conclusions is as follows: 



'"Among tlie numerous volcanic rocks which I liave from the south of Luzon. 

 Samar, and Leyte and in tlie related tuffs, there are represented with few 

 exceptions only two tj'pes, closely related, both being characterized by tlie presence 

 of triclinic feldspars and distinguished one by hornblende, and the other by 

 augite; hornblende andesites and aujiitio andesites or dolerites." 



"In this paper Kemp's classification of igneous rocks is followed. The 

 petrographic determinations are t)y Dr. W. D, Smith. 



