Eleventh annual report of the United States Geological and Geographical Survey of the Territories : embracing Idaho and Wyoming : being a report of progress of the exploration for the year 1877 . Geological Survey. Flatv p Bast Sectvarv Z. kkduch.] EAST OF WIND EIVER EANGE TEIAS. 81 Within oiir district tlie Triassic beds have reached a good developmentand are exposed very frequently. One of the best known occurrenceseast of the Wind Eiver Eange is that of Eed Canon. If we stand onTwin Peak and look towards the northeast, we will have before us agradual slope down to the narrow valle
Eleventh annual report of the United States Geological and Geographical Survey of the Territories : embracing Idaho and Wyoming : being a report of progress of the exploration for the year 1877 . Geological Survey. Flatv p Bast Sectvarv Z. kkduch.] EAST OF WIND EIVER EANGE TEIAS. 81 Within oiir district tlie Triassic beds have reached a good developmentand are exposed very frequently. One of the best known occurrenceseast of the Wind Eiver Eange is that of Eed Canon. If we stand onTwin Peak and look towards the northeast, we will have before us agradual slope down to the narrow valley of Deep Creek. Bising imme-diately upon the eastern bank of this small stream we see a steep redwall, continuing for the distance of several miles. The remarkable bril-liancy of color renders it a very striking feature of the landscape. Anexamination of this wall will reveal the fact that it is composed almostentirely of bright red shales and sandstones. Near the base of the serieswe rind red sandstones, highly argillaceous and rather thinly little higher up the strata grow thicker and somewhat coarser. Theyare separated from each other by thin layers of very fine-grained far we have seen about the lo
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