WATERFALLS 473 



1338. Upper Geyser basin, Yellowstone park. 



1344, 1347. Upper falls of the Yellowstone, Yellowstone park. 



Weathering 



(See also Schistosity, Cleavage, Jointing, and Wind Erosion) 



176. Granite showing effect of cleavage fractures in producing forms of erosion, 

 Conness Peak trail. Yosemite valley, California. 



186. Rock basin, Yosemite valley, California. 



187. Weathering of biotite-granite, ridge south of Morrison creek, a branch of 



the Tuolumne river, Yosemite valley, California. 



226. Eolian erosion in rhyolite, Mono valley, California. 



268, 269. Granite boulders resulting from disintegration of massive granite, Sierra 

 Nevada, Inyo county, California. 



271. Cherty layers in limestone, Inyo county, California. 



283. Shattered granite crest of the Sierra Nevada, Tuolumne county, California. 



289. Exfoliating granite on crest of Sierra Nevada, south of Raymond peak, Cali- 

 fornia. 



319. Dakota sandstone near an old lake Agassiz shore-line, Kettle hill, Swan 

 lake, Manitoba. 



362. Volcanic boulder drift, chief geologic feature of Central America. 



371. Mount Sneffels, San Juan county, Colorado. 



372. Characteristic cliff of fine-grained andesitic tuff, Bridal Veil basin, near Tel- 



luride, Colorado. 



373. Characteristic cliffs and pinnacles of coarse-bedded andesitic breccia and 



tuff; South Lookout peak near Ophir, San Juan mountains, Colorado. 



377. Typical cliffs of bedded breccias and tuffs, Vermilion peak, San Juan moun- 

 tains, Colorado. 



392. Spherical sundering in basalt, northern Table mountain, Golden, Colorado. 



398. Cliffs on San Juan tuff, north of Full Moon gulch, Colorado. 



509. Weathering of oolitic limestone near Herodsburg, Indiana. 



537. Saint Peter sandstone, Iowa. 



540. Niagara limestone stairway at " Devils Backbone," Delaware county, Iowa. 



542. Leclaire limestone below drift, Scott county, Iowa. 



666-669. Carboniferous sandstones 8 miles south of Livingston, Montana. 



677. Eroded sandstones, Teton county, Montana. 



713, 714. Cones formed by unequal erosion of rhyolite-tuff in foothills of Pal- 

 metto mountains, Nevada. 



771, 772. Niagara limestone, joint face exposed in quarrying southwest of Middle- 

 port, New York. 



810. Decay of upper semi-crystalline beds of Trenton limestone above Trenton 

 falls, New York. 



913. Decomposed trap rock at Wadesborough, North Carolina. 



985-987. Trap boulders, French creek falls, Pennsylvania. 



991. Gneiss peak, Lower Bethel township, Delaware county, Pennsylvania. 



1040. Field of gabbro boulders, southeastern Pennsylvania. 



1041. Concentric weathering in bank of Ohio river, Pennsylvania. 

 1097-1098, 1107-1108. Granite needles near Harney peak, South Dakota. 



LXVIII— Hiii.i.. «Kor.. Roc. Am., Vol. 13, 1901 



