. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 128 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. It is noteworthy that here, as iu the neighborhood of Lee's Ferry, laudshdes have taken place where the blue clays have been uncovered by the encroachment of the eastern platform on the base of the Triassic cliffs. This was the case just west of Pipe spring, where the former head of the western platform has been deeply undercut. The blue clays were seen here and there along the base of the refreshed cliffs, and several landslides were noted in the same small distri
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 128 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. It is noteworthy that here, as iu the neighborhood of Lee's Ferry, laudshdes have taken place where the blue clays have been uncovered by the encroachment of the eastern platform on the base of the Triassic cliffs. This was the case just west of Pipe spring, where the former head of the western platform has been deeply undercut. The blue clays were seen here and there along the base of the refreshed cliffs, and several landslides were noted in the same small district (L, Figure 6). Relation of the Pipe Spring Divide to the Pipe Spring Fault. — An- other peculiar feature of the eastern platform near Pipe spring is that it crosses the line of the Sevier-Toroweap fiiult (see that section) with unbroken grade, and that its descent is against the heave of the fault; that is, from the relatively depressed block of the Uinkaret to the rela- tively uplifted block of the Kanab plateau. No topographic indication WXSMSMM^^S^m. FiGORE 7. View north near Pipe spring. Vermilion cliffs of Triassic plateau in background: the eastward dip of strata toward the Sevier-Toroweap fault-line is seen on the right, Pipe spring being near the end of the cliffs. The "wall" of the migrating divide sweeps through the middle of the landscape. Drawn from a sketch. of the fault is preserved at this locality, because the weak lower Trias- sic shales on the west are brought against the weak Permian shales on the east. The obliteration of the fault, as far as the relief of the sur- face is concerned, is an unusual feature of the plateau region, according to Dutton ; for while he noted the obliteration of the Shiuarump escarp- ment iu the neighborhood of Pipe spring (c, p. 80) he did not connect its disappearance with any dislocation, and he elsewhere remarked that " every fault in the district is accompanied with a corresponding break in the topography&qu
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