the erp slope of Smith’s 
cts of gold, silver, and copper, 
h we ae found i in them at the lat- 
er pla 
It is impossible to say how much 
of the desert region lac of Ju- 
— eleng to this same metamor- 
"he time ot the origin 
of the range, ‘the metam 
the 
8 whith are 
The West American Scientist. 
eruptive rock known as norite, gab- 
ae d, rita constitute many of 
most prominent : 
the Gasamsnl: Nejus a 
many lesser ones near Dehesa aa 
erna 
West of the granite si Perey 
covered by the mesa is a very 
liar volcanic breccia or tu hick 
blends at times nto beautiful black, 
gray or reddish porpa aries. ‘h 
formation is older than the eres 
It extends from a nae a little 
of San Marcos southeasterly to ine 
oundary line, where it has a width 
of 7 or 8 an The c conspicuous 
peaks, mountain, San Miguel, 
and Uiay ure formed of this sisi 
To the presence of this dark basi 
rock is due a lar Ropoen of the 
rich, Moar? soil of sie 
ANCIENT RIVER 
ee 
EL. 
One of the most intate esis dis- 
coveries made was that of the exist- — 
ence of an ancient river channel ata_ 
Ramo- 
point south of the road from 
Only by the exist- 
acta Se a eteta Me 
