. Mineral Resources of the United States, 1902. ^brooks, while on the gentle slopes of the hills spruces flourish andafford the usual woodlands of the higher ranges. The roads are laidout through these forests. Down Douglas Creek, at a distance of 2 aEng. and Min. Jour., December 28,1901. & Am. Jour. Sci., 4th series, vol. 13, 1902, p. 95. 244 PLATINUM. 245 or 8 miles from the Rambler, the meadows cease, and the creek trav-erses a deep rocky gorge with precipitous cliffs. Almost the entiresurface is covered by a capping of the products of weathering inthe form of the so-called wash. Only rarel
. Mineral Resources of the United States, 1902. ^brooks, while on the gentle slopes of the hills spruces flourish andafford the usual woodlands of the higher ranges. The roads are laidout through these forests. Down Douglas Creek, at a distance of 2 aEng. and Min. Jour., December 28,1901. & Am. Jour. Sci., 4th series, vol. 13, 1902, p. 95. 244 PLATINUM. 245 or 8 miles from the Rambler, the meadows cease, and the creek trav-erses a deep rocky gorge with precipitous cliffs. Almost the entiresurface is covered by a capping of the products of weathering inthe form of the so-called wash. Only rarely are natural outcrops. Diorite andperidotiLe Granite ^v^^|I| Gneiss p^^f^:^>:;•.v QuartzileScale Fig. 1.—Map of the Rambler mining district, Wyoming. Rl, R2, R3. R4, and R5 mean Ramblerclaims 1, 2, 3, 4, and 5. The min<? is on Rl. of the country rock to be met. The extensive prospecting has, how-ever, quite frequently cleared away the loose materials down to thebed rock, and, as the accompanying map shows, has served to revealthe essential rock formations which are present. 246 MINERAL RESOURCES. GEOLOGY. S3^stematic observation in the area about the mine soon served toshow that the commonest country rock in its immediate vicinit}^ is agneiss of the general mineralogy of granite. Its distribution and thatof the other local formations are shown on the map, iig. 1. Thegneiss is somewhat poorly foliated and is very badly broken by irreg-ular sets of joints, which divide it into small angular fragments on theoutcrops and in the prospects. Under the microscope, the rockexhibits in a still more pronounc
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