. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 254 BULLETIN: MUSEUM OF COMPARATIVE Figure 13. The canyons of Ash creek, near Toquerville. (Fig. 13). Apparently Ash creek cut the latter canyon before the last faulting, although possibly after the premonitory upheaval. At the time of the faulting the lava sheet was bent and the creek was tipped out of its old channel to the recent one. Benewed cliffs are everywhere the rule, although the most striking examples are the far-reaching lines of the great Pink, White, Vermilion, and Chocolate terraces.
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 254 BULLETIN: MUSEUM OF COMPARATIVE Figure 13. The canyons of Ash creek, near Toquerville. (Fig. 13). Apparently Ash creek cut the latter canyon before the last faulting, although possibly after the premonitory upheaval. At the time of the faulting the lava sheet was bent and the creek was tipped out of its old channel to the recent one. Benewed cliffs are everywhere the rule, although the most striking examples are the far-reaching lines of the great Pink, White, Vermilion, and Chocolate terraces. Of the three processes — namely, the stripping of soft strata, the cutting of canyons, and the formation of cliffs — the first and last two are now in a state of great, perhaps maximum, efficiency, while the first is already almost completed. The combined result of the three is a region of strong contrasts, where the three elements — canyons, plains, and cliffs — are utterly different, and yet all in their freshness and nakedness bear the stamp of newness and of a dry climate. But this is not everywhere the case, for in the Colob plateau the ancient mature topography is still preserved, and acts as a foil to set off the new. Yet it is the latter that is impressive. Old slopes have been revived and steepened; enormous tusks of massive red sandstone have been carved out of the once con- tinuous upland (Plate 1 B), and deep canyons marvellously narrow and steep have been sawed far into the depths of the plateau. One of these, that of LeVerkin creek, is so cleft-like that for several miles, where the depth is over fifteen hundred feet, only a narrow strip of sky thirty degrees wide can be seen, and sometimes this is reduced to fifteen degrees. In many places the walls overhang the tumbling brook at a height of several hundred feet, and forever prevent the sun from pene- trating to the cool depths, which, after the hot, verdureless glare of the lowland desert, seem ideal in
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