184 GEOLOGICAL SURVEY OF THE TERRITORIES. 



Catalogue of rocks collected, ^c. — Continued. 



Gray sandston6,'(Cretaceous) ■ 



Hard, greenish aandstoue, (Cretaceous) 



Hard, gray sandstone 



Soft, gray sandstone 



Basalt 



Volcanic breccia 



Trachyte 



Khyolite 



Basalt, with olivine 



Basalt- tuff 



Diabase 



Blie slate 



TraoLyte 



Soft sandstone, (Cretaceous) 



Clay slate, (Cretaceous) 



Mail 



Sandstone, (Tertiary) 



Quartzite, (Cretaceous) 



Sandstone, (Cretaceous) 



Purple sanidino trachyte 



Micaceous gneiss 



Limestone, (Carboniferous) 



Brown sandstone metamorphosed, (Tertiary) 



Trachyte-breccia 



Trachyte 



Gneiss 



White rhyolitic 



Volcanic sandstone 



Gray sandstone 



Micaceous gneiss 



Quartz 



Trachy tic sandstone 



Obsidian porphyry, (black) 



Obsidian porphyry, (brown) 



Obsidian porphyry, (perlite-like) 



Porphyritic obsidian 



Spberiilitic obsidian , 



Vesicular trachyte-porphyry 



White trachyte-porphyry 



PJiyolite 



Jasper 



Perlite-lilje trachy te-porphj'ry 



Green and brown jasper 



Cavernous trachyte-porphyry 



Common trachyte-porphyry 



White trachyte 



Vesicular trachyte 



Porphyritic trachyte 



Obsidian porphyry 



Vesicular trachyte 



Argillo-trachyte porphyry 



Hot-spring deposit 



Trachyte-conglomerate 



Trachytio tuff 



Vesicular trachyte 



Brown obsidian sandstone 



Black obsidian sandstone 



Purplish volcanic conglomerate 



Red volcanic conglomerate 



White trachyte ^ 



Trachyte porphyry 



Gey serite sandstone 



Trachyte porphyry 



Rhyolito 



Cavernous trachyte, (porphyritic) 



Vesicular trachyte-porphyry 



Siliceous limestone _ 



Quartzite 



Gray calcareous sandstone, (Jurassic) 



White arenaceous limestone 



Blue limestone, (Carboniferous) 



Jaspery limestone-conglomerate 



Bridger Peak, near Fort Ellis. 



Do. 

 Head of Middle Creek, Montana. 



Do. 

 Valley of Yellowstone Eiver. 

 ISearBotoler's, Montana. 



Do. 



Do. 



Do. 



Do. 

 Cinnabar Mountain, Montana. 



Do. 

 Electric Peak, Yellowstone Valley. 



Do. 



Do. 

 Valley of Yellowstone Eiver, near 



Boteler's. 

 Bluff' opposite Gardiner's Eiver 



Do. 



Do. 



Do. 

 Mouth of Black-Tail Deer Creek, 



Montana. 

 !Near mouth of Black-Tail Deer 



Creek, Montana. 

 Near Elk Creek, Montana. 



Do. 



Do. 



Do. 

 East Fork of Yellowstone Eiver. 

 Near Tower Creek, Yellowstoiie 



Valley, Montana. 

 Near junction of East Fork of Yel^ 

 lowstone, Montana. 



Do. 



Do. 

 Near Grand Canon of Yellowstone. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Grand Canon of Yellowstone Eiver. 



Do. 



Do. 



Do. 



Do. 

 Violet Creek, valley of the Yellow- 

 stone. 

 Crater Hills, Yellowstone Valley. 



Do. 

 Near Mud Volcanoes, Yellowstone 

 Valley. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Fire-Hole Basins, Yellowstone Na- 

 tional Park. 

 Upper Canon of Madison Eiver. 



Do. 



Do. 



Do. 

 East side of Madison River, near 

 Middle Caiion. 



Do. 



Do. i 



Do. 



Do. 



Do. 



