182 GUIDEBOOK OF THE WESTERN UNITED STATES 
Irene, where the two tracks cross and where also the highway crosses 
the stream and railroad.. Farther west, downstream, are exposures 
of agglomerate, a breccia or conglomerate of volcanic origin. 
As the train approaches Marsh and Pantano sidings and from 
these places to Vail, there are seen to the south the Empire Moun- 
Pinta. tains,** culminating in Mount Fagan (elevation 6,175 
foot). In these mountains there are many small min- 
Elevation 3,547 feet. . ° ° 
Population 30.* ing prospects, mostly of silver ores; mines about Hel- 
pe’ Orleans 1,472 yvetia, on the western slope, have produced ore in 
eee mo daeabe amount. This range extends south to the 
Santa Rita Mountains, in which there are several small mines, notably 
% 
a 
bee “e684, Carbonih = 
Q oO ny rbponiferous 
X, : 
: Quartzites Abrigo a s SSK Qe 
Reb Ano me tone NEQe Sea commas 
N ranit LIRR EN a RSS ANS SN = : 
EAN SS SAS RAK S 
i ROARS SS SS SASSSS WZ 
Dikes 
1000 2000 Feet 
i i j 
FicureE 46.—Section 1 mile north of Helvetia mining camp, Ariz. 
near Greaterville and Old Baldy. Some of the geologic relations are 
shown in Figure 46. 
From points near Vail it may be seen that the Rincon Mountains 
merge into the pres Verde Mountains (tahn’kay vare’day), which 
Vail. n turn merge into the Santa Catalina Mountains, to 
as ba ihe northwest. The ranges are separated by saddles, 
New poker 1480 and each one has a prominent projection to the west. 
— The prevailing rock in these ranges is a hard massive 
schist, but the Sante Catalina Mountains include toward the north 
a large mass of granite. On the west end of the Rincon Mountains 
Carboniferous limestone and other strata form foothill — which 
% In the various ridges of the Empire | Bol rtzite (Camb din 
Mountains are exposed Bolsa quartz- Davidson Canyon. The outer slopes 
ite, Abrigo limestone, Martin and over- | of the mountains consist of sandstone, 
lying i shale, and conglomerate of Lower Creta- 
; glomerate consisting of pebbles and 
) i cobbles of various colored limestone, 
limestone pre-Cambri granite | quartz, and other materials. 
oat vumeseacne part of the summit oonaiomgems indicates a time break 
: many millions of years re represented 
nes are over- pe i by late Paleozoic, Mesozoic, 
strata, Jurassic strata, 
