440 N. H. DARTON — CATALOG OF PHOTOGRAPHS 



1250. Glacier peak, Monte Cristo. View from the same point as number 1249, 



taken with a narrow angle lens to show details of Glacier peak (No. 36). 



1251. Glacier peak from Goat peak, Monte Cristo. From ridge between the crater* 



basin of Twin lakes on the right and the glacial amphitheater leading 

 down to Monte Cristo on the left, looking east. The rocks in the fore- 

 ground are granite. Glacier peak and near high ridge composed of vol- 

 canic breccia. The contact between the two occurs along a vertical plane 

 immediately at the foot of the first ascent from the foreground (see 1257). 

 The flows from Twin Lake crater are distinctly bedded and dip eastward 

 (see 1252) (No. 20). 



1252. Cliffs of porphyrite and breccia, Glacier peak, Washington. View from the 



same point as 1251 ; taken with a narrow angle lens to show details of 

 bedded and vertical structure in flows from Twin Lake crater (No. 21). 



1253. Looking west from Goat peak, Monte Cristo. View of Silver lake and Sil- 



ver Tip mountain, H miles southwest of Monte Cristo, Washington. The 

 rock of the vicinity is a massive volcanic. The lake occupies a basin, 

 which is presumably a crater, but which may possibly belong to the class 

 of hollows produced by retrogressive glacial erosion. Attention is called 

 to the extremely abrupt peaks characteristic of this portion of the Cascade 

 range (No. 31). 



1254. Silver lake, Monte Cristo (see 1252). Near view of Silver lake, showing the 



outlet and the surrounding cliffs of porphyrite (No. 24). 



1255. Looking down Twin lakes, Monte Cristo. General view of Twin lakes about 



three miles southeast of Monte Cristo. They occupy basins of craters, the 

 largest being about half a mile in length. The rock surrounding them in 

 the foreground, on the right of the picture, is granite, while much of the 

 farther side of the lake and the foreground in the extreme left is volcanic 

 breccia. Spherulitic rhyolite occurs at the east end. The higher cliffs in 

 the vicinity are largely made up of breccia with granite fragments. The 

 foreground exhibits roches moutonnees (No. 26). 



1256. Upper Twin lake from the east end, Monte Cristo (see 1255). View from 



the east end of upper Twin lake. The cliff on the right is granite, while 

 the talus in the foreground is composed of blocks of volcanic breccia. 

 Immedaitely behind the camera, cliffs of breccia rise about 2,500 feet to 

 the summit of Glacier peak (see 1251 and 1252) (No. 27). 



1257. Volcanic breccia of Twin Lake crater, Monte Cristo (see 251). The camera 



stands on the arete between Twin lakes and the "'76" amphitheater, 

 looking into the latter. The breccia on the right was erupted from Twin 

 lakes, and is in immediate contact with the granite, of which it contains 

 fragments (No. 25). 



1258. Sauk mountain from near Sauk, Washington. It rises abruptly on the 



western bank of the Skagit river. It is an old volcanic vent, probably 

 represented by a lake which now lies in a deep basin near the summit. 

 The elevation is about 5,800 feet, and the volcanics are erupted through 

 a mass of iron-bearing schist and limestone (No. 41). 



1259. Landslide crack, Sauk mountain. On the left of the view the descent is 



precipitous for 500 or 600 feet. The crack in the middle ground on the 

 right is evidently due to an outward movement of the rock mass toward 

 the cliff, but is now filled with debris to within a few feet of the top 

 (No. 48). 



