506 GOODMAN. 



to be a yellow limestone of coralline origin, ranging in hardness from 

 a very soft, porous variety to one almost holocrystalline. 



On February'' 7, the route continued in a northerly direction for a great 

 portion of the distance in the bed of Budyan Creek, which is a branch 

 of the Magum Eiver. The latter is about 30 meters wide where we 

 crossed ; it flows in a southeasterly direction into the Sahug Eiver. 



During this entire day we encountered onlj' outcrops of an impure, 

 compact, and greenish appearing sandstone containing a small amount of 

 calcite. These beds, which evidently underlie the limestone, strike in a 

 general north and south direction, and dip at steep but varying angles 

 to the westward. 



The route changed more to the northeast on the following day, ascend- 

 ing a densely wooded ridge termed Mount Kinabuungan, which we 

 estimated to be about 400 meters above sea level at the place where we 

 crossed it. This was the highest elevation attained on the trip to the 

 Agusan. 



Mount Kinabimngau forms part of the range which extends from Mount Pa- 

 namboyan in a nortlieasterly direction to the Agusan River. This range consti- 

 tutes the northern boundary of the Sahug River watershed. The inclination of 

 the sandstone beds swings through an angle of about 45° in direction, the dip 

 changing from west to northwest and the strike becoming approximately parallel 

 to the Kinabuungan mountain range. 



An outcrop of fossiliferous clay was observed on the Mauntoc Eiver, 

 at an elevation of about 175 meters above sea level, overlying a conglom- 

 erate which in turn overlies the sandstone. The fossils were all of 

 marine shells, apparently of very recent origin, and many of them had 

 been so little disturbed and so well preserved that they still retain their 

 original color and polish. 



Travel was necessarily slow at this point owing to recent rains because 

 of which the rivers were swollen, so the party was compelled to spend 

 the night on the bank of the Manacum Eiver. 



The clay beds on the following day's march showed some signs of 

 increased dynamic action. They became somewhat folded and cleavage 

 planes developed, perpendicular to the bedding planes. We traveled 

 almost due east until we again encountered the Sahug Eiver which we 

 crossed at the barrio of Banglasan. At this point the stream is about 

 15 meters wide, iiowing between clay banlcs about 5 meters high. Ban- 

 glasan, which is about 200 meters above sea level, is the largest barrio we 

 entered since leaving the Tagum Eiver. 



One of the affluents of the Sahug called Tabunanan Creek was the 

 line of march on the next morning almost to the barrio of Hoagusan, 

 which was reached early in the day. This place is situated on the divide 

 between the Sahug and Agusan Elvers, and according to our hypsonietcv 

 is 240 meters above sea level. The beds between Banglasan and Hoagusan 

 consist of the same sedimentaries which had previously lieen encountered, 



