48 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
in the piedmont slope beneath the quartzitic series. Along the base 
of the southern part of the Smoothback escarpment, there is a piedmont 
ridge a mile or more in length, consisting of quartzite and limestone, 
apparently with normal dip, but much below the normal position, as 
in figure 25 and in Plate 3, A. Finally there are some low spurs 
below the northern end of the Sawtooth escarpment, two or three 
Fie. 24,— Displaced strata at the base of the western escarpment, Swazy mass; 
looking north, 
miles north of Painters ravine, where layers of limestone of unknown 
position in the series dip to the northwest at moderate angles. When 
the general regularity of the monoclinal structure in the range is re- 
called, with prevalent dips to the east and southeast, it becomes all the 
more significant that the several cases of westward dips are found in 
narrow belts of displaced layers along the western base of the range, 
Fie. 25 — The southern end of the Smoothback escarpment, with displaced 
strata at its base; view looking north past the notch of the southern road. 
where the occurrence of a great fault is clearly indicated by independ- 
ent evidence. 
In view of all this it may be fairly said that the essential conse- 
quences of the fault-block theory of the Basin ranges are successful in 
meeting the appropriate facts with which they are here confronted, 
and that the theory is worthy of acceptance, so far as House range is 
