160 Kansas Academy of Science. 



are here placed in the supposed Cretaceous list: The soft to hard 

 green slate (talc) of the upper Bogachiel country; the hard gray 

 sandstone and flinty slates of the north slopes of the Olympics; 

 and the pre-Oligocene rocks on the Pacific coast not given in the 

 previous supposed preCretaceous list. The correlation is based on 

 the stratigraphic position and the lithologic character of the rocks. 



The green talc series is found in the Bogachiel valley near the 

 head waters of that stream. It is several thousand feet in thick- 

 ness. For the most part it is a soft slate interbedded with gray 

 sandstone and some shale. It is pitched nearly to a vertical posi- 

 tion, with a trend of dip between a southeast and a northwest and 

 an east and west direction in the region visited. The next forma- 

 tion described above is superimposed upon it. It extends to the 

 Hoh valley and likely to the region of the glaciers, judging from 

 the milky-colored sediment in the glacial waters of the Hoh river. 

 It is also found unconformably beneath the supposed Cretaceous 

 sandstone series of Johnson Point on the coast north of the mouth 

 of the Quillayute river. It is in this formation that the Bogachiel 

 and Hoii rivers have cut their respective canon-like channels. No 

 fossils were found in this formation. On account of its reaching 

 its greatest development in the Bogachiel valley, it is here termed 

 the Bogachiel formation. 



The second group of supposed Cretaceous rocks extends from 

 the Eocene exposures near Port Crescent south to about four njiles 

 south of the Soleduck Hot Springs. At the north it is mostly 

 hard gray sandstone: but nearing the Soleduck, and between the 

 tributaries of that stream, it is for the most part a flinty, dark-col- 

 ored slate, though soft carbonaceous shales are found exposed on 

 the South slope of tlie ridg«- whicli separates the main cliannel of 

 the Soleduck from its northern fork. On weathering the flinty 

 slate takes on an iron-rust c^jh^r In this rt gion it was found that 

 the nucleus of all the ridges was this flinty slate; the streams have 

 cut their channels in the softer sandstones and shales. From the 

 Soleduck Springs south to the top of the Soleduck-Bogacliiel di- 

 vide the formation is alternating — very hard to soft shale and 

 sandstone. The rocks are raised nearly to vertical position, the 

 trend being nearly east and west. South of the river about 20,000 

 feet of continuous rock are exposed on the surface; and, the rock 

 standing practically on end, its thickness would be about the same 

 number of feet. North of the Soleduck the thickness of the rock 

 must be as great or greater, but its approximate thickness could 

 not be determined, as the country is much broken by faults. And 



