. The state of Wyoming, a book of reliable information published by authority of the eighth Legislature . Mineral Resources. 97 The schists show for a distance of about thirty miles long,from ten to twelve miles wide, the longer axis bearing north-easterly and southwesterly, in the same general direction as thestrike of the schists, and with a general dip to the north, vary-ing from 45 degrees to the perpendicular. Around these schistsare the granites on the northwest and the succeeding sedimen-tary formations on the northeast and the tertiary formationson the southerly sides. Nearly all the r
. The state of Wyoming, a book of reliable information published by authority of the eighth Legislature . Mineral Resources. 97 The schists show for a distance of about thirty miles long,from ten to twelve miles wide, the longer axis bearing north-easterly and southwesterly, in the same general direction as thestrike of the schists, and with a general dip to the north, vary-ing from 45 degrees to the perpendicular. Around these schistsare the granites on the northwest and the succeeding sedimen-tary formations on the northeast and the tertiary formationson the southerly sides. Nearly all the rocks of this region, but especially the abovementioned schists, show strong evidence of alteration andchange, in many instances giving an appearance entirely for-eign to the character of rock, but an examination with an ordi-nary field lens is often sufficient to determine the true characterat once. This altering material is usually silica, and where therocks are weathered as on an exposed outcrop, a hard quartzosecharacter is noted, and these are frequently called dykes, butare simply altered schist
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