Lazvs of Nezv Mexico Mountain Ranges. — Ilerrick. 311 
DESCRIPTION OF PLATE XVII. 
These cross sections are, of course approximate only and the ver- 
tical scale is greatly exaggerated. They serve to show, in a general way, 
the distribution, and also to suggest the cause of the faults referred to 
in the paper. 
Section A. is a section from north-west to south-east through the 
crater immediately north of Little Baldy. The line of section is some- 
what curved to cut the two isolated p2.iks. Little Baldy peak is brought 
into the section to indicate the relation of the stratified rocks in the 
immediate vicinity of the area of disturbance. 
Section B is on a larger scale and is a diagrammatic section of Little 
Baldy looking south (the other sections are seen from the south). 
The numerous fault lines at the foot of Little Baldy on the west run 
into the crater to the south in a few yards and diverge towards the 
north to become widely separated and profound faults. The section 
on the east slope is a very good one and shows in detail the presence 
of the three main divisions of sedimentaries. What I have called the 
Graphic-Kelly formation consists of crystalline and light-colored lime, 
separated by a close-grained, dense lime, resembling lithographic stone, 
known locally as the "Silver-pipe" lime. It is the bearer or support- 
ing zone for the great stopes of ore. This property it has by virtue 
of affording an entrance to water th"t dissolves the overlying crys- 
talline limestone to variable extents. The ore accumulation is usually 
along faults at the intersection of the silver pipe lime. The Sandia 
series is well-developed and consists, as usual, of shales, quartzytes and 
sandy lime beds There are a few fossils of the usual types. Above this 
series is the very fossiliferous base of the upper series with the large 
type of Athyris cRrgentea, as contrasted with the small form in the San- 
dia beds. The massive upper lime series is only partly represented- 
Section C. is nearly east and west and includes Elephant butte on 
the west and crosses the main range. The region of faults is propor- 
tionally somewhat narrower than here shown, and some of the minor 
faults are omitted. The equivalent of the two benches, at 7 and 11 
respectively, can be traced for miles along the slope of the range, ap- 
pearing as plateau-like fiats on each of the cross-ridges and giving 
unmistakable evidence of the continuity of the great faults when seen 
from a distance of five miles or more. In this section the red-beds, or 
"Permian" sandstones, are present, as they are for a distance of over a 
mile at the appropriate position. They may be well seen near the town 
of Kelly and, of course, represent a dislocation of at least a thousand 
feet as compared with the Coal Measure beds into juxtaposition with 
which they have been so forcibly brought. 
G^pper-silver deposits have been mined near the little rhyolyte em- 
inence indicated and are ascribed in seme of my papers to digested 
Permian strata. This is, of course, a mere guess. 
Section D. is farther north, not far from the town of Kelly, but does 
not embrace the whole section, which has grown quite wide at this 
