RECONNAISSANCE OF MINDANAO AND SULU : III. 377 



found a chloritic schist, reddish-brown in megascopic specimens, and 

 containing a large amount of secondar}' quartz. He thought it to be 

 an alteration product of the original diabase. He goes on to say that 

 both coasts of the peninsula are composed of sedimentary strata. A 

 pink limestone, intersected by numeroixs veinlets of calcite, rests on the 

 west flank of the igneous intrusion, while the east coast is mainly con- 

 glomerate and bro\\Ti shale. These beds at Mount Badas attain a 

 thickness of over 180 meters and dip about 45° toward the southwest. 

 In the vicinity of Mount Mayo' the formation is sedimentary. Mr. 

 Goodman found the conglomerate here dipping at an angle of approxi- 

 mately 30° to the east. The boulders in the conglomerate are igneous. 

 At a place called Lucatan, about midway between Mayo Bay and the 

 town of Tarragona, the formation changes from conglomerate to the 

 limestone l)ing above. It is an elevated reef. This limestone lies 

 unconformably above the conglomerate. 



Goodman found a seam of coal about 85 centimeters thick on the 

 south bank of Cobatoc Creek about 9 kilometers north of the town 

 of Tarragona. The seam dips at an angle of about 15° south 50° east. 

 A conglomerate of coarse sandstone immediately underlies it, while 

 above is a soft, brown shale which, in turn, is overlaid by an impure 

 limestone. This coal in general appearance is much like the other 

 coals of the islands; it is sub-bituminous. Goodman believes that this 

 is a most favorable point for further prospecting. 



We have very little information about the east coast. A set of speci- 

 mens given me by Father Sanchez, a Jesuit missionary who was stationed 

 at Baganga for some time, includes orbitoidal limestone of a beautiful 

 pinkish color, evidently the same formation found by Goodman farther 

 south, specimens of silicified wood and a rock made up of a large 

 nimiber of coral stems all completely siliciiied. A number of specimens 

 which simulate the petrified bones from the flipper of some cetacean also 

 appear in the collection. The likeness is very remarkable, but these speci- 

 mens are probably not petrified bones, the phenomenon being due simply 

 to the wearing of alternate hard and soft layers from a calcareous forma- 

 tion. It is evident that there is considerable residual limestone left on 

 the hill tops in this cordillera. Specimens of andesite are also to be 

 found on the beach at Baganga. 



The next point at which Goodman touched is Bislig, at the head of 

 Bislig Bay. On his way across from Lake Linao to Bislig, he encountered 

 much the same formation as he had seen farther south. He examined a 

 coal deposit a short distance up the Bislig Eiver, but was unable to learn 

 much about it without a great deal of exploration. It is of considerable 

 importance to know the mere fact that coal outcrops at two distant points 

 on the east coast. 



