GEOLOGICAL SURVEY OF THE TEKEITORIES. 203 



Catalogue of rocks — Continued. 



Name. 



Spherulite .' 



Obsidian, with spherulite 



Pink trachyte 



Pbrphyritic obsidian 



Volcanic conglomerate 



Old hot-spring deposit 



do 



White trachyte tufa 



Argillaceo'tts sandstone 



Eod volcanic pudding-stone 



Trachytes 



Porphyritic obsidian 



Trachyte 



Spherulite - . . 



Porphyritic obsidian 



Trachyte 



Trachyte, with hornblende and calcite.. 



Volcanic breccia 



Old hot-spring deposit 



Gray trachyte, infiltrated with sulphur. 



White trachyte 



Ked trachyte 



Bluish trachyte 



Greenish trachyte 



Gray trachyte, with hornblende 



.do. 



.do 



Obsidian 



Porphyritic obsidian 



Red and black basaltic rock 



Hot-spring deposit 



Silicified wood 



Ked rhyolitic rock 



Volcanic breccia 



Volcanic conglomerate 



Chalcedony 



Hot-spring deposit 



White and red variegated sandstone. 



White trachjrte 



Greon trachyte .• 



Hot-spring deposit 



Yellowish trachyte 



Hot-spring deposit 



Sandstone 



Volcanic conglomerate 



Basalt, (black) 



Basalt, (red) , 



Basaltic rocks, (black) 



Quartzite 



Brown coarse sandstone 



Blue clay-slate 



Clay-slate 



Greenish-gray sandstone 



Siliceous clay-slate 



Dendritic sandstone 



Limestone 



Granite 



Hornblende schist 



Granite 



Gneiss 



White quartz 



Ked compact sandstone 



Yellow calcareous sandstone. 



Dark-blue limestone 



Garnetiferous gneiss 



Mica schist , . . 



Quartzite 



Clay-slate 



White quartzite 



Limestone 



Old hot-spring deposit 



Basalt 



Ked sandstone 



Quartzite 



Limestone 



do 



Coarse gray sandstone. ....... 



Dark-pur pilsh rhy elite 



Light-bluish rhyolite 



Locality. 



Grand Canon of the Yellowstone River. 



Do. 



Do. 



Do. 



Da. 



Do. 

 Crater Hills, Yellowstone Kiver. 



Do. 

 Mud-volcanoes, Yellowstone Kiver. 



Do. 

 East Fork of Madison Elver. 

 ITear Madison Lake. 

 West side of Yellowstone Lake, 

 Southern shore of Yellowstone Lake. 



Do. 



Do. 

 Promontory Point, Yellowstone Lake. 

 Southeast shore of Yellowstone Lake. 

 Brimstone Basin, east side Yellowstone Lake. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Top of Mount Stevenson, east side of Yellow- 

 stone Lake. 

 Top of Moun,t Doane, east side of Yellowstone 



Lake. 

 East shore of Yellowstone Lake. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 STortheast shore of Yellowstone Lake. 



Do. 

 'Do. 

 Turbid Lake, near Yellowstone Lake. 



Do. 



Do. 



Do. 



Do. 

 Pelican Creek. 



Do. 

 South branch of East Fork of Yellowstone 

 Kiver. 



Do. 



Do. 



Do. 

 mesLV Crow Indian agency, Yellowstone River. 

 Near Fort Ellis, Montana Territory. 

 East side Gallatin Kiver, Montana Territory. 



Do. 



Do. 



Do. 

 Between Jefferson and Madison Rivers. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 West side of Jefferson River. 



Do. 



Do. 

 Black-Tail, Deer Creek Valley, Montana Ter. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Beaver Head Rock, Montana Territory. 



Do. 

 Beaver Head Canon, Montana Territory. 



Do. 



