182 GEOLOGICAL SURVEY OF TI^E TERRITORIES. 



Mount Blackraore, Montana Territory ; beautiful blue siiecimens 

 with jasper, in Hot Spring district, Montana Territory ; from Jack- 

 sou's Lake, Wyoming Territory. Carnelian, from Grand Caiion 



I of Yellowstone. Ghrysoprase, East Fork of Yellowstone liiver. 

 Prase^ East Fork of Yellowstone Lake, Montana Territory ; Wil- 

 low Caiion, Utah Territory ; near lower cafion of Madison River, 

 Montana Territory. Agate, banded, near Fort Ellis, Montana Ter- 

 ritory^; in Yellowstone Valley, above second caiion ; East Fork of 

 Yellowstone River, near Elk Creek, Yellowstone Valley, Colorado 

 Springs, Colorado Territory. Mochastone {moss-agate,) nearBoteler's 

 ranch, Yellowstone Valley, Montana Territory. Flint, (bluish 

 variety,) in valley of Yellowstone ; West Gallatin River ; (brow^n va- 

 riety,) Pole Creek near Madison River, Montana Territory ; (black 

 variety,) East Fork of Yellowstone River. Jasper, (red variety,) in 

 conglomerates, near Ogden, Utah Territory ; near Fort Ellis, Mon- 

 tana Territory ; Yellowstone Valley, Montana Territory ; back of 

 Boteler's ranch, Montana Territory; East Fork of Yellowstone 

 River; near Elk Creek, Montana Territory; east side of Middle 

 Caiion of Madison River ; (yellow variety,) Bridger Peak, near Fort 

 Ellis, Montana Territory ; East Fork of Yellowstone River ; (gray 

 variety,) East Fork of Yellowstone; (green variety,) East Fork of 

 Yellowstone River; near Horseshoe Bend of Missouri River, below 

 Gallatin City, Montana Territory ; on Henry's Fork of Snake River; 

 (black variety,) East Fork of Yellowstone River. SiUcified ivood, 

 abundant throughout the valleys of Yellowstone, Madison, and Gal- 

 latin Rivers, and on the Yellowstone National Park. Itacolumite, 

 (common inflexible variety,) near Mount Cowan, Yellowstone Valley. 



Eipidolite. In metamorphic rocks, near Ogden, Utah Territory ; east 

 side of Middle Caiiou of Madison River, Montana Territory ; near 

 Henry's Lake, Idaho Territory ; Teton Mountains, Idaho Territory. 



Sanidine. (See Feldspar.) 



ISatin-spar. (See Gypsum.) 



Selenite. (See Gypsum.) 



Serpentine. Near Ogden, Utah Territory; in Snowy Range of Yellow- 

 stone; divide between Madison and Gallatin Rivers ; Aider Gulch, 

 near Virginia City, Montana Territory ; Caiion Creek, a branch of 

 T^ton River, Idaho Territory. 



Silicitied wood, [t^ee Quartz.) 



Silver, (Native.) Cherry Creek mines, Madison County, Montana Terri- 

 tory ; in galena, from Little Cottonwood Ciiiion ; Clarke's Fork mines. 



Sphalerite, (zinc blend.) Little Cottonwood Caiion, Utah Territory. 



Strontianite, (carbonate of stroutia.) Sawtelle's Peak, near Henry's 

 Lake, Idaho Territory. 



Sulphur. In crystals, at Gardiner River Hot Springs ; on bluffs op- 



l)osite Tower Falls ; in Mud Springs, near Mount Washburne, in 



small crystals; Crater Hills, Yellowstone Valley ; geyser-basin of 



Fire- Hole River ; Shoshone Lake geyser-basin ; on divide between. 



Yellowstone and Fire-Hole Rivers. 



Talc. Near Ogden, Utah Territory ; in Snowy Range of Yellowstone, 

 Montana Territory ; near Henry's Lake, Idaho Territory; T^tou 

 Mountains, Idaho Territory. 



Tremolite. (See Amphibolc.) 



Tufa, (Calcareous.) At Hot Sjmngs, Gardiner's River; Warm Springs, 

 near Fort Hall, Idaho Territory ; Grand Caiion of Snake River, 

 Idaho Territory. 



Wulfenite. Little Cottonwood Canon, Utah Territory. 



