‘DAVIS: THE WASATCH, CANYON, AND HOUSE RANGES. 23 
Recent faulting along the mountain base is exceptionally well shown 
hereabouts. The gray scarp of the fault line is fresh and continuous 
across spur bases and valley mouths, as in figure 6. An excellent exam- 
ple of repeated faulting is seen in a fan about three miles northeast of 
Nephi, as in figure 7. The earlier fault here had a displacement 
of about 100 feet; then a valley several hundred feet wide was opened 
in the uplifted part of the fan; after this a smaller displacement 
of about 20 feet occurred, making a very light colored band along 
the base of the earlier scarp and continuing for a mile or more south- 
ward through the piedmont waste slope. Like the recent faults north 
of Payson canyon, these are above the Bonneville shore line. 
It is certainly significant that none of the recent faults have been 
observed within the mountain mass, although if they occurred on the 
front slope of the Wasatch in this district they could hardly have 
escaped detection. Even on the lines of the older transverse faults 
Fıc. 7.— Double fault scarp, base of Mt. Nebo Wasatch. 
which traverse some of the Basin ranges, no recent movements have 
been reported; but on the contrary these interior transverse faults 
have, in nearly all reported cases, been followed by a great amount of 
erosion, sufficient in some examples to bring about the topographic 
reversal of the faulting, and make the surface of the heaved block 
lower than that of the thrown block. It is therefore legitimate to 
regard the transverse faults, along with the composition, the folds, and 
the fossils that occur within the mass of a range, as relatively remote 
Contingencies; they are not necessarily connected with the problem 
in hand, excepting in so far as they, as well as the composition, fossil 
contents, and folds of the mountain rocks, are disregarded by the 
base line which cuts across them all indifferently and thus shows 
their antiquity in contrast to its recency, 
‘There was an element of personal satisfaction that resulted from 
this part of the excursion along the Wasatch front. The details of 
Mountain form here observed and sketched in their actual occurrence 
gave good warrant for the correctness of a hypothetical diagram, here 
reproduced in figure 8, which I published in Science for September 
