. Annual report. 1st-12th, 1867-1878. Geology. GEOLOGICAL SURVEY OF THE TERRITOEIES. 35 and tliirty miles from east to west, underlaid by the Pliocene deposit?, inclining gently northwest, influenced probably by the Black-tailed Deer Eange. The country about these sources or branches of the Jef- ferson fork is very fine, and appears most attractive to the eye, with a fertile soil, excel- lent water, and well adapted for settlement, except that the win- ters must be very severe. • The elevation of the valleys is from 6,000 to 7,000 feet,'involving early and late frosts, and deep winter snows. A
. Annual report. 1st-12th, 1867-1878. Geology. GEOLOGICAL SURVEY OF THE TERRITOEIES. 35 and tliirty miles from east to west, underlaid by the Pliocene deposit?, inclining gently northwest, influenced probably by the Black-tailed Deer Eange. The country about these sources or branches of the Jef- ferson fork is very fine, and appears most attractive to the eye, with a fertile soil, excel- lent water, and well adapted for settlement, except that the win- ters must be very severe. • The elevation of the valleys is from 6,000 to 7,000 feet,'involving early and late frosts, and deep winter snows. About a mile be- fore Wild Oat Canon opens into the valley, the variegated por- 13hyries commence, a dull purp- lish color prevailing, though yel- low and mottled are not un- common. The porphyries ai)- pear to have been poured out over the metamorphic rocks j from the south side of the Black- tailed Deer Valley they project out from the hills in beds much like basalt. The configuration of the surface where the por- phyries prevail is quite pecu- liar—sharp, rounded, conical peaks, with deep ravines or gorges. These peaks are all capped with the porphyries. Immense quantities of the broken fragments or debris lie on the summits and sides of these hills. On the east side of the valley the Pliocene beds reach a thickness of 500 to 1,000 feet, and are composed of pud- ding-stones, yellow marls, gray and white fine-grained sand- stones, weathering into singular columnar and other architect- ural forms. All the rocks con- tain more or less lime. Both Black-tailied Deer and Stinking Water Creeks have their sources in a high range of limestone mountains, 9,000 to 10,000 feet above the sea level, the highest peaks rising at least 2,000 feet above the valleys of these streams, where they are crossed by the road. High up on the sides of these ridges, reaching. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - c
Size: 901px × 2774px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, bookpublishe, booksubjectgeology
