336 J HARLEN BRETZ 



terminal moraine, and the limits of the Juan de Fuca Glacier as 

 shown in Figure i are only approximate. 



Glacial till is exposed at the junction of Beaver Creek and 

 Soleduck River, near Pleasant Lake. It is dark gray in color, and 

 contains some finely striated and faceted pebbles. Several granite 

 pebbles, like those in the typical drift of Puget Sound, were found 

 here. 



Many bowlders, some of them finely striated, are scattered along 

 the road from Pleasant Lake to Forks, and from Forks almost to 

 Mora at the mouth of Quillayute River. 



Granite bowlders with a maximum diameter of 5 feet lie in 

 coves between rocky headlands along the beach immediately north 

 of the mouth of Quillayute River. Their situation and their size 

 render it highly improbable that they traveled along the beach for 

 any considerable distance. The occurrence of granite bowlders 

 here, and between Forks and Mora, indicates that the Juan de 

 Fuca Glacier probably pushed south of the latitude of Cape Johnson. 



Two miles north of Cape Johnson there is a sea cHff of glacial 

 till, 25 feet high. The till is light colored and has many pebbles of 

 the same kinds of rock which give Puget Sound drift some of its 

 conspicuous pebbles. The fresh gray color and the shallow oxi- 

 dized zone above it indicate the Vashon age of the deposit. It is 

 material derived unquestionably from the feeding grounds of the 

 great piedmont glacier whose bifurcation formed both the Puget 

 Sound and Juan de Fuca lobes. Material from the Olympics is 

 either lacking or a negligible quantity. The deposit apparently 

 lies in a pre- Vashon valley whose northern portion contains Ozette 

 Lake. 



Between this place and Cape Flattery, at the extreme north- 

 western tip of the Olympic Peninsula, there are several such sections 

 of till in the sea cliffs. There are also exposures of outwash gravel 

 derived from the same source. The Juan de Fuca Glacier, composed 

 of ice from Georgia Strait, clearly pushed out beyond the present 

 coast. On Vancouver Island, it reached at least 1 5 miles farther 

 west than the longitude of Cape Flattery. Valley trains indicate 

 that the sea stood 30 feet or so above tide at the time of this gla- 

 ciation. The Juan de Fuca Glacier therefore must have possessed 



