300 W. D. Smith — Notes on Radiolarian Cherts in Oregon. 



fcions in the Philippine Islands. Not only do we find the 

 same sort of formation in those islands, but in Borneo,* Java, 

 Molluccas, Ceram,f etc. 



Both Martin and Hinde have assigned these cherts to the 

 Jurassic or Triassic and, following them, the writer has done 

 the same in the Philippines. The radiolarian-bearing rocks 

 of Roti and Savu (D. E. I.) are associated with beds of lime- 

 stone containing Ilalobias and Daonellas. The cherts, as 

 described, are strikingly similar lithologically to our West 

 Coast rocks of this character.:}: We are nevertheless well 

 aware tbat fossil radiolaria are far from being satisfactory index 

 fossils. , 



These notes are here given in the hope that they will throw 

 some light on this part of West Coast stratigraphy. To one 

 who has dealt with geological problems on both sides of the 

 Pacific, there is a remarkable similarity in the stratigraphic 

 columns of the two. 



University of Oregon, Eugene, Ore. 



* Hinde, App. I, 9, Molengraaf's Borneo, 1902. 

 ■(•Marten, K., Eeisen in den Molukken, Leiden, p. 164, 1902. 

 % Hinde, Radiolarian rocks, etc. Jaerbcrek van het Mijnwesen in Nederl. 

 Oost-Indie, xxxvii, 1, 2, 1908. 



