Rocky Mountain Trip 
23 
tremendous? the walls rise with m unbroken slope to the summits 
of the quartzites * The carboniferous slopes form high Midget 
between the streams and are succeeded by the oretaoeoiu lines of 
hog backs and the level plains md canon divided mesas * The shales 
between the bands of trachyte in the peak are changed to hard 
metallic like quarts it ic slate with both over and under the trach¬ 
yte, fhe heads of the Manees do not seem to out deeper than the 
©hales, the whole mountain and the neighboring spur© being made 
of alterations of shale and trachyte, In the head of Bear Creek, 
however, the red beds appear capped with a heavy bed of trachyte * 
The red b-ds also appear beneath the trachyte in some of the east¬ 
ern summits» The trachyte extends considerably along the divide 
and caps a couple of points over toward the Wilson group. 1 
doubt if IT- . 1 occurs in the area between the forks of Bear Elver. 
She point occupied by Chittenden and myself lust year on the ridge 
between Bear a;4. Boleros Elos is jur&wsic. Beneath is rea and 
then carboniferous. One of the buttes oyei tc ward 111 son is 
capped with trachyte. There is probably & dyke. A large mss 
of trachyte on the spur near whore our mules were hitched does 
not belong to the bedded class but extends downward ae if it be¬ 
longed to a subterranean mss. The cliffs are quite high where it 
is exposed. The heads of the valleys are full of slides of trach¬ 
yte, The great rounded beds of loose rooks lock mobile aa won or 
dough. The whole of the lower slopes of the mountain consist of 
a series of irregulur steps caused by successive slides or aval¬ 
anche masses, Trees and 'brush cover the more gentle and loss 
rocky slopes. It is curious that nearly the whole area between 
nxe kaneos and Lost Canon is irregularly terraced by landslides. 
i 
