248 The Philippine Journal of Science 1922 
this is an igneous rock that has undergone such pressure as to 
make it seem clastic. Some magnetite is present. However, 
despite its apparent clastic nature, I am inclined to designate 
this rock a dacite (?). 
The first Malumbang (Pliocene) limestone to be recorded was 
found at locality F871. This, as well as the limestone at locality 
F872, farther east, on Malinao River, is yellow, argillaceous, 
and fossiliferous, yielding corals and mollusks, but is character- 
ized by the absence of Foraminifera. In contrast to this are all 
the other limestones we have collected on the island and which 
are characterized by the inclusion of certain species of Lepido- 
cyclina or other Foraminifera. 
Between these two limestone localities, about 9 kilometers 
east of Bagakay, a specimen was picked up and labeled in the 
field, “Igneous, weathering to clay” because it was seen that 
the small core of an igneous rock had given rise to the clay 
which now surrounds it.. A microscopic examination shows that 
the rock ig characterized by small .plagioclase crystals lying in 
a dense, glassy groundmass; a few small crystals, probably of 
hornblende; and some small vugs. On account of its texture 
and composition, I have classified it as basalt. 
East coast—From Marabgas, the party traveled in native 
dugout boats down Malinao (Tubig) River to Taft, which lies 
at the mouth of the river and on the Pacific Ocean. On the 
way we noted a soft, fine-grained, noncalcareous, argillaceous, 
tan-colored sandstone, which was badly weathered and contained 
many plant fragments. The grains are feldspathic to a large 
extent, are not well rounded, and are loosely consolidated. A 
clay-shale is also found along this river. On the north bank of 
the Malinao, opposite Taft, is an outcrop of massive marl, which 
lithologically is very similar to that at Wright. South of the 
town are several small, lunar bays, and at their horns’ ends 
Recent coral occurs, while north of Taft to Dolores the trail 
lies along a narrow, sandy coastal plain. 
Embayed and irregular shore lines and the drowning of Ma- 
linao River are evidences of subsidence in the vicinity of Taft 
and Dolores. Coral reefs, also, point to subsidence. Fig. 1 is & 
profile of the ocean floor east of Taft and shows a gently shelv- 
ing platform to the 25-fathom line, where there is an upbuilding, 
then the depths become greater, with fluctuations, out to the 
Pacific Deep. Fig. 2 isa similar profile from Dolores to Hilaban 
Island and likewise may indicate subsidence. It is true that 
