376 SMITH. 



with large, more or less sluggish streams and few rock exposures. Some 

 fossils which Mr, Goodman collected at Maasin in a recent marl have 

 been examined by me. They are all extremely recent and marine, 

 showing that the sea in Pleistocene times came up as far as this point, 

 that is, to the southern part of the lakes. 

 Mr. Goodman says:'' 



An estuary leading into a small pond which di-ains into the Agusan is situated 

 at a place called Maasin, about 3 kilometers south of Veruela. An outcrop of 

 soft, blue shale, containing a large variety of fossil shells in an excellent state 

 of preservation occurs on the west bank of this estuary. These fossils as well as 

 those collected at Tagusap and other places, have been sent to Dr. Smith at 

 Leyden, Holland, for study and comparison. 



They were also found at San Bafael on this river. Some of the species 

 are Venv^ sqiiamosa Lam., Tagalus coarctatvs Gm., Area rwdosa K. 

 Mart., Ranalla subgranosa Beck., Turritella cinquelifera Sow. 



I know of no developed economic deposits in this district. However, 

 gold is reported from several branches of the Agusan Eiver and possibly 

 this will be fruitful dredging ground some day. Mr. Garvan, of the 

 division of ethnology of the Bureau of Science, who is thoroughly ac- 

 quainted with this region and its inhabitants, informs me that gold is 

 panned in paying quantities by the natives in the -district of Cansuran 

 and neighboring mountains to the west, and in the headwaters of the 

 Solibao, Adlayan, Bunauan, and Hinatuan Rivers. Gold is reported 

 also from the following rivers: Bila}', Masago, Ua-Ua, Culi, and the 

 Quilanear Guadalupe. Coal has been found on the Ua-Ua, Culi, and 

 Bunauan Elvers. 



There are practically no roads in the subprovince, and this, coupled 

 with the lack of rock exposures, makes it extremely unlikely that the 

 Agusan district in the northern part, at least, will for some time to come 

 be of any importance as a producer of mineral. There should be some 

 excellent transported clays in this valley, which might be utilized. 



THE SURIGAO DISTRICT. 



I include in the Surigao district the cordillera in the extreme eastern 

 part of the Island of Mindanao. Our knowledge of the geology of the 

 rocks of this region is extremely limited. Goodman has crossed it in 

 the vicinity of Mati at the head of Pujada Bay. He found the ridge 

 to have a core of igneous rock which had undergone some metamorphism. 

 The original, unaltered diabase, which is the most common rock en- 

 coimtered, presents a tj'pical ophitic structure and contains in addition 

 to the feldspar and ferromagnesium minerals, a considerable proportion 

 of secondary quartz and microscopic crystals of apatite. Goodman also 



T/iis Journal, Sec. A (1908), 3, 509. 



