PHOTOGRAPHS DONATED TO THE SOCIETY 467 



(779). Dakota and Lakota sandstones through upper gateway to Perry park, 

 south of Denver, Colorado. 



Twenty-three 6^ x 8J photographs, by Bailey Willis 



(163). Columbia valley, Washington, southeast of lake Chelan ; looking north, 

 east across the river to the terraces of Pleistocene age and the high 

 plateau of Miocene basalt. 



(167). Navarre coulee, lake Chelan, Washington. Torrent wash due to cloud- 

 burst on granite slopes in arid climate. 



(182). Lake Chelan, Washington, exhibiting the canyonlike gorge which the 

 lake occupies. 



(183). Lake Chelan, Washington. View northward across eastern end of lake, 

 showing terraces produced during glacial occupation of the lake basin 

 in lakelets between the ice and the land. 



(193). East end of lake Chelan, Washington. Detailed view of drift dam, 

 showing cross-stratified sandy clays covered by till, gravel, w^ash, and 

 turf in ascending succession. Between the till and the cross-stratified 

 sands are pockets of coarse gravels and boulders, which probably 

 correspond to stream channels. 



(194). Lake Chelan, Washington, and outlet. General view of the drift dam 

 and the site of Chelan. 



(196). Stehekin valley, about 2 miles east of Cascade pass. Cascade range, 

 Washington ; showing the profile due to profound erosion followed 

 by glaciation. 

 Cascade pass, Cascade range, Washington. Basin at the head of 

 Stehekin east of the pass, showing the character of the glacial amphi- 

 theaters and the remnants of glaciers still lingering among the heights. 



(200). Cascade pass, Cascade range, Washington. View^ from the summit of 

 the pass, 5,300 feet, southward to the headwaters of Cascade river. 

 The high peaks rise to about 8,800 feet. 



(201). Cascade pass, Cascade range, Washington. CliflTs of hornblendic gneiss 

 immediately south of the pass, about 3,000 feet in height, exhibiting 

 vertical jointing. 



(202). Cascade pass, Cascade range, Washington. Glacier and basin at the 

 head of Stehekin river. 



(204). Basin peak. Cascade range, Washington, north of Cascade pass. View 

 of doubtful lake and slope of the mountain, showing joint systems, 

 which are commonly mineralized. 



(207). Cascade pass, Cascade range, AVashington. Typical glacier of the 

 northern Cascade range, showing a neve and the incipient ice-stream , 

 with crevasses. 



(208). Detail of number 207, showing stratification of the ice and structure of 

 the glacier. Taken from the same point as number 207 with long- 

 focus lens. 



(210). Cascade pass. Cascade range, Washington. View from an elevation of 

 about 7,500 feet southeastward down the Stehekin valley. The 

 mountain summits fall into a general plane, which was a lowland of 

 late Pliocene time and is now elevated 8,000 feet above sea and pro- 

 foundly- dissected. 



