468 R. ARNOLD RECONNAISSANCE OF THE OLYMPIC PENINSULA 



dipping monocline, the beds of which appear to have a total thickness of 

 over 15,000 feet. 



South of the Clallam Bay-Cape Flattery monocline is the western ex- 

 tension of the axis of the Olympic mountains. The structure in the 

 region about this line of disturbance is quite complex, but as one goes 

 away from it toward the south the structure becomes simpler. Several 

 determinable folds with northwest-southeast axes were noted along the 

 coast between the Ozette and Hoh rivers, and in the vicinity of the mouth 

 of the Quinaielt there is a very prominent syncline developed in the 

 Pliocene, with its axis parallel to those just mentioned. 



A great uplift in the Olympic Peninsula region appears to have taken 

 place at or near the close of the Miocene epoch, and still another lesser one 

 during the late Pliocene. That orogenic movements are still taking place, 

 or have occurred since the deposition of the Pleistocene, is evidenced by 

 the very gently folded and tilted clays, sands, and gravels in the vicinity 

 of Port Angeles. 



