38 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
miles we reached some low isolated limestone ridges in which the 
northeast strike of the beds, with northwest dip, did not agree with 
the general north and south trend of the relief. Similar isolated ridges 
had been noticed north of Indian Spring, and we were led to suppose 
that all of them belonged together on the crest of an otherwise 
buried fault block. Shorelines, apparently at the Provo level, were 
well carved on the ridge slopes; the cut platforms were seldom over 
fifty feet wide, even where they faced a broad stretch of deep waters 
in the ancient lake; and this confirms the opinion already expressed 
that the large terminal facets of the Wasatch spurs cannot have been 
to any significant extent carved by the Bonneville waves, for the cut 
platforms would have to be at least a thousand feet broad to match 
them. 
Several sketches of the House range, including figures 19 and 21, 
were drawn from one of the isolated ridges in the oppressive heat of 
the afternoon, but clouds and haze again prevented our taking any ser- 
viceable photographs. A low range on the western side of the inter- 
OE, 
AW he vy 
is, AS 
Fic. 14. — Bevelled upland, west of the southern end of the House range, look- 
ing south. 
mont basin, some miles to the south, showed an even upland which 
bevelled its west-dipping strata, as in figure 14, this was one of the 
few cases in which a form, apparently referable to an earlier cycle of 
erosion, was recognized. To the west of the isolated ridges and beyond 
an arm of the basin plain, a long slope or wash ascended gradually into 
open branching valleys between the sprawling, fading spurs of a sub- 
dued and low desert range, which stretched north-northwest from the 
bevelled upland, figured above. The indefinite baseline in the range 
trended northwest, while the strike of its west-dipping strata was more 
nearly north and south, so that one member of the rock series after 
the other ran obliquely down from the range crest to its frayed-out 
border and disappeared under the wash. The general appearance of 
a part of this range, as seen from the western base of the House range 
two days later, is shown in figure 15, without indication of structure. 
It seems here as if a peneplain, eroded on west-dipping strata, might 
