Geological Papers, 161 



the faulting still continues; the present ridges contain great cracks 

 and fissures, often miles in length, and show every sign of even 

 recent earthquake disturbances. 



Below is a partial section of the rock of the ridge which sepa- 

 rates the Soleduck from its north branch (the North Fork) 600 

 yards above the bridge on the government trail, beginning on its 

 down-stream side : 



Gray sandstone 100 feet. 



Veryflinty, dark slate, weathering toan iron-rust brown, 120 " 



Gray sandstone 40 " 



Dark slate, often having the luster of hard coal 300 " 



Gray sandstone 20 " 



This formation is seen to dip under the Eocene of the Port Cres- 

 cent region (?). In two summers the writer was unable to find a 

 fossil in it. For convenience this formation will hereafter be called 

 the Soleduck formation. 



The third group of supposed Cretaceous rocks is exposed on the 

 Pacific coast and extends as a narrow strip from about two miles 

 south of the Point of the Arches to near Cape Elizabeth on its 

 northern side. It consists of coarse gray, often very massive sand- 

 stone, with occasional zones of dark shale, which is coal- bearing in 

 a few places, though the veins are always thin. A conglomerate 

 rock is also found interbedded in the formation now and then. 

 This formation also extends to the islands off the coast. The axis 

 of the uplift has a general southeast-northwest trend, correspond- 

 ing roughly to the coast- line and the trend of the dip of the strata, 

 which dip in a general way to the northeast, varying locally to a 

 northwest dip in many places. The angle of the dip varies from 

 thirty degrees to sixty degrees, averaging about forty-five degrees 

 in the vicinity of La Push. The formation extends inland, from a 

 mile in the vicinity of Ozette lake to about two miles at Johnson 

 Point, while south of the Quillayute river it widens eastward. 



From the farthest island off the coast to the most northerly limit 

 inland of this formation, on a line at right angles to the trend of 

 the dip of the strata, the distance is about six miles. The average 

 dip being forty-five degrees, this would give more than 15,000 feet 

 as the thickness of the rock thus exposed, 10,000 feet of which is 

 in the submerged platform. ^' 



The series is characterized by its having calcite veins running 

 through it in all directions. These are abundant in nearly all ex- 



21. One of the islands off the coast is characteristic for having its strata dip southwest, di- 

 rectly opposite to the dip of the strata of its sister islands; this seems to be due to some local 

 faulting-. 



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