BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 VOL. 17, PP. 451-468, PLS. 55~58 SEPTEMBER 24, 1906 



GEOLOGICAL BECONNAISSANCE OF THE COAST OF THE 

 OLYMPIC PENINSULA, WASHINGTON* 



BY EALPH ARNOLD 



(Bead before the Cordilleran Section December SO, 1905) 



CONTENTS 



Page 

 Introduction , 452 



Previous literature 452 



Location 453 



Topography and physical features 454 



The Olympic mountains 454 



The coastal region 455 



Geology 457 



The Olympic mountains 457 



Previous knowledge of the region 457 



Probable composition 457 



The coastal region 459 



Geologic formations 459 



Supposed pre-Cretaceous 459 



Supposed Cretaceous 459 



Eocene : Crescent formation , 400 



Oligocene-Miocene : Clallam formation 401 



Fossils from the Clallam formation 403 



List of fossils from the lower clay-shale (Oligocene) 403 



List of fossils from the second horizon or massive sandstone. 40. M > 



List of fossils from the third horizon or Miocene .sandstone.. 403 



List of fossils from near the top of the Clallam formation 404 



List of fossils from the equivalents of the upper beds of the 



Cape Flattery section 404 



Correlations 404 



Coal in the Clallam formation 404 



Pliocene 405 



Quinaielt formation 405 



Fossils from the Quinaielt formation 405 



Pleistocene ^ 400 



General character of the deposits 400 



Gold in the Pleistocene gravels 407 



Geologic structure in general 407 



* Published by permission of the Director of the U. S. Geological Survey. 

 XL— Bull. Gbol. Soc. Am., Vol. 17, 1905 (451) 



