368 The American Geologist. June, 1902. 
railroad is close enough to the volcanic range to give a good 
view of it. Long streaks of white and yellow among the 
rocky red strips suggest the bedded tuffs of the Rosamond 
series. In fact, the general appearance even to some details 
is characteristic of that series. A few spots have the peculiar 
small-wrinkled topography elsewhere characteristic of the 
Upper Pliocene terranes. Several groups of purple moun- 
tains in the direction of Randsburg as seen from near Kramer 
indicate outlines of the Rosamond series far to the north from 
the main belt. 
Just west of Barstow is a hill of red and pink massive 
rhyolyte. A similar red hill occurs just east of the town. A 
bare rock of the same material stands in the valley by Mohave 
river north of town. A small hill of the same is on the south 
edge of town. These are remnants of a thick sheet which 
once occupied the valley. Other remnants occur at the foot 
of black and gray mountains of old dioryte arid gneiss, a few 
miles northeast of town. Still farther in that direction the 
view is backed by one of the high rugged groups of dark 
red and yellow-spotted mountains typical of the Rosamond 
series. This is the highest of the region and is five miles north 
of Daggett. An important borax mine is situated somewhere 
on its slopes. The view from Daggett to north, east and south 
shows only rugged sierras apparently all of the volcanic ser- 
ies. It is evident that east of Barstow the rhyolyte spreads out 
over a very extensive territory and becomes a very important 
Tertiary series largely burying the granite and gneiss of the 
old complex. 
A spur from the high red peak north of Daggett comes 
down nearly to Mohave river just northeast of the village. It 
shows typical Rosamond topography and colors at the higher 
levels. I observed in the hills near the border of the valley the 
following phases: 
1, Massive pink lava; appearance on casual survey much like 
andesyte but on close inspection with a hand microscope it seems as 
acid as some rhyolytes. 
2. White and purplish rhyolyte; slightly porphyritic, with flow 
structure well developed so as to weather out with the’ appearance 
of a stratified formation, thin-bedded and highly tilted. 
3. Breccia-conglomerate of lava and granite fragments. 
4. Red sandstones and red_ shales. 
