LOWER GEYSER BASIN 
September 2* 
Broke camp in the Bower Geyser Basin and began our march to 
the Yellowstone falls.- Crossed the ridge back of camp to the 
trail on east fork. Followed a little valley that separates 
the conglomerate strata of the buttes from the massive .reddish 
coarse grained rough surfaced trachyte that lies east of it. 
There are some hot springs on both sid^s of the divide in 
the little cross valley. Could not trace the conglomerate 
beyond the creek. On both sides of the creek there are well 
marked cliffs of reddish trachyte --also grayish and purplish-- 
much of it is finely laminated and greatly contorted (see 
specimens) On the north side where the road runs by the cliff 
there are 1 urge i a lien masses. 
There was nothing but this rock as far up as the bend 
in the river. The cliffs run out and the slopes are gentle. 
In ascending the dividing ridge by the Howard road we came 
upon a great variety of rocks. , white fine grained trachyte 
(see specimen) which lies about in large masses. Gray and 
purplish trachytes and a variety of grades of the pitchstone 
porphyries. There are but few outcrops. On the divide 
there is a pretty little lake 500 or 600 yards in diameter 
along the shores of which are collected in a curious jumble 
■a great many varieties of rocks in large and small masses. 
A porous or fibrous, light, yellow gray trachyte, a hard 
black trachyte with white specks (decomposed sandstone j 
