THE PHILIPPINE 



Journal of Science 



A. General Science 



Vol. IV SEPTEMBEE, 1909 No. 5 



GEOLOGICAL RECONNAISSANCE OF THE ISLAND OF 



LEYTE— WITH NOTES AND OBSERVATIONS ON 



THE ADJACENT SMALLER ISLANDS AND 



SOUTHWESTERN SAMAR. 



By George I. Adams. 

 {From the Division of Mines, Bureau of Science.' 



Little has been published concerning the geology of the Islands dis- 

 cussed in this report. Jagor, who visited the northeastern part of Leyte 

 in 1860, noted the occurrence of a schist south of Tanauan, and described 

 Bito Lake near Abuyog and the solfataras south of Burauen. His 

 petrographic specimens were examined by Eoth. A single specimen of 

 igneous rock from the Island of Limasaua Avas described by Oebbeke who 

 studied Semper's collections. Abella visited and described the Island of 

 Biliran in 1882, especially its sulphur deposits. Becker cites passages 

 from a manuscript report made hj Ashburner in 1883 on the gold mines 

 of the Island of Panaon. All the publications above mentioned were made 

 use of by Becker in his report on the geology of the Philippines. In 

 treating of the tectonic features of the islaiads, he discusses the structural 

 relations of the Island of Leyte as surnrised by others and adds some 

 observations from his study of the maps. In the Atlas de Pilipinas, 

 prepared at the Jesuit Observatory in Manila, the conventional sign for 

 an extinct volcano is shown on a general map of the islands near the 

 name "Mount Amandiriing." This sjaubol, as will be explained later, may 

 have been intended to indicate the solfataras south of Burauen. There 

 is also a manuscript report by Maurice Goodman, formerly mining 

 engineer of this division of the Bureau, which describes tlie sulphur 

 deposits on Biliran Island and those near Burauen on Leyte visited by liim 

 in 1906. 



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