VIII, A, 4 



Smith: Fossil Invertebrate Fauna 



237 



will have some value. My aim has been to put on record, 

 even though it has to be revised later, what we have in the 

 Philippines in this department of science. 



I wish to make special acknowledgment of assistance rendered 

 to Dr. K. Martin, professor of geology and head of the Geo- 

 logisches Reichs-museum in Leiden; to R. Bullen-Newton, Esq., 

 paleontologist, British Museum; to Prof. H. Douville, pro- 

 fessor of paleontology in PEcole de Mines, Paris ; to Dr. William 

 H. Dall, curator of conchology, United States National Museum, 

 Washington. 



PART I. STRATIGRAPHY 



PHILIPPINE STRATIGRAPHY AND GENERAL STATEMENT 



The same general groups of rocks exist in the Philippines as 

 are found in other parts of the world. There are deep-seated 

 igneous rocks, intrusives, and volcanic flows ; there are metamor- 

 phic rocks and sediments, both consolidated and unconsolidated. 

 Although the Philippine Islands may appear to the layman to 

 be almost entirely volcanic, there is a wide distribution of the 

 sedimentary series. In the latter the fossils are found, and 

 consequently we can pass rapidly over the discussion of the 

 igneous and volcanic rocks. 3 



, Andesites. 



Hornblende andesite. 



Pyroxene andesite. 



Hornblende-pyroxene andesite. 



Olivine-bearing pyroxene ande- 

 site. 



Hornblende-biotite andesite. 

 Basalts. 

 Dacites. 



Leucite tephrites. 

 I Granite. 

 Syenite. 

 Quartz diorite. 

 Diorite. 

 Metadiorite. 

 Gabbro. 

 Peroxenite. 

 Peridotite. 



Extrusive. 



Plutonic and intrusive. 



* Igneous rocks of the Philippines will be found described in the following : 

 Becker, G. F., Geology of the Philippine Islands, 21st Ann. Rept. U. S. 

 Geol. Surv. (1901), pt. 3, 493; Smith, W. D., The essential features of the 

 geology of the Philippines, This Journal, Sec. A (1910), 5, 307; Iddings, 

 J. P., The petrography of some igneous rocks of the Philippines, This Jour- 

 nal, Sec. A (1910), 5, 155. 



