24 The Philippine Journal of Science 1922 
efit of those who may wish to examine it in the future. It 
should be borne in mind that this is a very inaccessible region 
and very difficult to traverse, and that the time spent on the 
ground was just a week. 
Fig. 1. Mindanao, showing the location of Pidatan oil seep. 
GENERAL RESULTS 
In the first place it should be stated that the results have been 
in the main negative ; that is to say, the geological reconnais- 
sance in the vicinity of the oil seep has revealed very unfavorable 
features, and the writer does not hesitate to condemn this local- 
ity as a prospective oil field. He is led to this conclusion by 
a consideration of the unfavorable geologic conditions as well 
as the difficulties of transportation, labor, supplies, ete. In view 
