THE 
SANTA FE ROUTE, 
127 
A fairly complete idea of the Grand Canyon can be obtained by 
observation for a few hours from the rim near the 
hotels. It is 
much more satisfactory, however, to go to Hopi and 
Local features.. 
vapai points and down 
to the river, or at least 
Ya 
to the Tonto Platform.- A visit to Grandview Point (Pls. 
nd XXXII) adds greatly to the completeness of the trip, and 
separation is effected by organisms of vari- 
ous kinds as well as by chemical reactions 
not connected with life. p sub- 
B 
e 
jor 
wm 
“> 
=] 
Pu 
D 
2 
ae) 
nm 
° 
All removed 
by running 
pate Te 
aa 
tied ee a 
Tonto group 
4N act 
ave 
x 
~ 
- 
ates 
ve 
aS 
e gray Coconino sandstone usually 
lies a dueeetly on the soft red shale at the 
top of the Supai formation. ‘The sand of 
stro 
and ae colored and the extensive cross- 
bedding (see Pl. XXIX, B, p. cre mndh 
cates ont gen were 
om a 
a 
FIGURE 28. UF de cicgeerpounarmgrages { Unkar rocks in Grand Canyon, Ariz. A, 
— been remo 
_ which they were deposited are not known, 
Pe undoubtedly they were derived from 
d 
the area of of Supa depositi 
we ngchanee toth 
nino beds was a very decided one, for the 
erosion; B, rocks of Tonto group 
iio devotion of the Coto- : 
Uplifted 
on surface of Unkar group and 
various directions. Such a deposit usu- 
ally accumulates ei: so aga 
tivel ae space fe oa — 
4 fa abruptly 
in the extensive sea thus formed waslaid — 
down the thick deposit of calcium <r 
