136 GUIDEBOOK OF THE WESTERN UNITED STATES 
knobs of rhyolite tuff capped by basalt of the older succession. The 
volcanic area here extends so far north as to cause considerable 
northerly deflection of the railroad to reach a long tangent that passes 
through Chappel and extends beyond Carne. At Chappel the lava 
fields are left behind, but detached igneous masses are in sight not far 
to the south and north. Two miles south of Dona siding is the very 
prominent Providence Cone, rising nearly 300 feet above the sur- 
rounding desert plain. Apparently it was the orifice of an old volcano, 
but any flow of which it may have been the source has either been 
removed or lies beneath the valley fill. Far to the west from this place 
extends the level-floored Mimbres Valley (mim’brace), which merges 
Goodsight Peak 
THT 
NTT I) 
aL fil 
: THEE | 
ETT Uli 
TT m7 
meer nt 
1S3 +27 Sone — — 
- Mex. Tb, lava (basalt); Tss, gray sandstone; Tcg, conglomerate; Tag, 
agglomerate 
into the Lake Guzman Desert, Mexico. This extensive basin has no 
surface outlet to the Rio Grande. 
Near Cambray, the highway crosses the railroad, and after following 
the track for some distance, goes due west to Deming. It comes 
e . from El Paso by way of Las Cruces, passing through 
Ei a country better suited for tourists than the sandy 
j 0° and desolate region traversed by the railroad. 
—— oe The old Butterfield stage route to California came 
through Mesilla, just south of Las Cruces, but crossed 
the desert in a course north of the present highway; it passed through 
a gap just south of Goodsight Peak and entered Cooks Peak Range 
in its southern extension, where old Fort Cummings was located 
adjacent to an excellent spring. (Turn to sheet 19.) 
North of Cambray are the prominent Goodsight Mountains, 
which consist of a thick sheet of basalt capping a mass of agglomerate 
and tuff; the basalt dips gently to the east, as shown in Figure 29, but 
Tises again in the mountains farther east. 
_* The agglomerate in the east slope | gray sandstone, both consisting largely 
- is & very Massive rock and consists | of voleanic materials and probably of 
: ! L in the lava 
a widespread eruption when it was poured out Evidently 
us or early T. the agglomerate was tilted lan 
e. It is overlain unconformably by | off by 
rosion prior to the deposition of 
soft | the overlying beds. 
