314 ANNUAL REPORT SMITHSONIAN INSTITUTION, 19 3 5 



striae were located on a partially loosened block close to the edge of 

 the cliff. By allowing for the amount of displacement, a reading of 

 N. 75° W. was obtained. In 1933 the same locality was revisited, 

 but the block had disappeared. In hopes of locating new exposures, 

 search was made to the south along the contact between the lava 

 and overlying fragmental material. While bedrock striae were not 

 found, owing to the weathered character of the exposed rock, an 

 excellent boulder moraine was discovered. The lower layer of frag- 

 mental material which was resting upon the lava at Sentinel Rock 

 gave way to glacial till containing nicely polished and striated stones. 

 Above the till was a thick layer of stratified pumice and occasional 

 bands of coarser material. Even with absence of bedrock striae, 

 evidence of a buried glaciation was convincing. 



Kerr Notch (14). — On the steep cliff of Danger Bay, just north of 

 Kerr Notch and 500 feet below the glacial material referred to above, 

 is a second buried glacial deposit. Striated stones ranging from 

 small pebbles to boulders 2 feet in diameter are common. The upper 

 portion of the till is roughly stratified, suggesting that rains or 

 glacial flooding accompanied the deposition. Above the glacial ma- 

 terial is a layer of columnar lava followed by alternating layers of 

 pumice and breccia; below it is a much weathered lava on which 

 no striae were found. 



In addition to buried evidence of glaciation, the U-shaped profile 

 of Kerr Valley offers proof of ice action (pi. 5, fig. 3). Like the 

 glaciated surfaces west of Cloudcap, the U-shaped floor of Kerr 

 Valley is buried with stratified pumice and fragmental material. 

 Since the stratification appears undisturbed, it is to be inferred that 

 glaciers did not exist in these areas during or after the eruption of 

 pumice. Judging from the heavy accumulation of pumice at Cloud- 

 cap, as compared with the 30-40 feet at Kerr Notch, glacial ice 

 probably remained in the valley for some time after it had aban- 

 doned the higher land to the north. 



/Sun Notch (15). — Between Applegate Peak and Dutton Cliff is 

 the broad U-shaped valley of Sun Creek (pi. 2, fig. 1). Below the 

 usual layer of pumice is a striated lava surface over which the ice 

 rode. At several locations between the highway and the rim 

 morainic features were recognized, although most of them were more 

 or less effectively buried by pumice and fragmental material. As at 

 Kerr Notch, the relationships suggest that the glacier abandoned the 

 valley prior to the last pumice eruptions. 



Dyar Eock (16). — A short distance west of Sun Notch in the col 

 between Garfield and Applegate Peaks a layer of glacial till rests 

 upon a striated lava surface. Compass readings indicate that the 

 ice proceeded in a N. 10°-20° E. direction. Above the till is a layer 



