19/ The American ()eologist. M.-mh, loor, 
having rich stores of both coal and iron, seems to be the 
one possible new location of the future great iron industry. 
IVof. Marsters said: r>elvidere Mountain lies approx- 
imately along the line between the counties of Orleans, 
Lamoille and LVanklin. It is a sharp crested ridge with a 
maximum elevation of some 2,100 feet above Eden Corners 
at its southern termination. Three topographic elements 
are prominent, a sharp crested ridge forming the upper 900 
feet of the mountain, a crescentic plateau with a Hat top 
1,200 feet above the valle}- floor and rimming the end of the 
mountain and lastly a steep slope composing the foot of the 
plateau and extending to the valley bottom. 
The upper part with steep slopes is composed of am- 
phibolite. in addition to the hornblende which make up 
sevent^'-five per cent of the rock, there is also present an 
inconsiderable amount of epidote and a non-pleochroic col- 
orless mineral regarded as zoisite, together with magnetite 
and pyrite. Towards the base, garnet becomes a promi- 
nent constituent, sufficient to make a well-defined garnet 
zone. In nearly all cases observed, the garnet is largely 
altered to penninite, a variety of chlorite. • Along the gar- 
net zone the hornblende has also undergone marked altera- 
tion in part to serpentine. The nose-like projection form- 
ing the plateau is composed of serpentine. In this rock 
occur the so-called asbestus deposits recently prospected 
and worked for this product. In thin section the serpen- 
tine appears to be made up largely of a felty and fibrous 
mass, apparent only under cross nicols. It is typical fib- 
rous scerpentine. In thin sections from the upper part of 
the plateau and in close proximity to the overlying amphi- 
bolite, there appear shredded masses presenting the original 
structure of hornblende as seen in the amphibolite, but 
mineralogically altered to a fibrous mass with the optical 
characteristics of anthophyllite. It is not improbable, 
moreover, that a portion of the hornblende has altered to 
tremolite. These fibrous constituents form the so-called 
"slip-fiber." 
The serpentine belt has also been subjected to peculiar 
faulting and crushing. The cracks thus produced even on 
a microscopic scale, have been filled with these fibrous con- 
stituents, and then the whole mass submitted to further 
slipping. This has caused the slickensiding phenomena 
on the fracture jilanes and a consecpient stretching of the 
fibrous content; hence the term "slip-fiber." "Cross-fiber" 
or true chrysotile is to be found in this area. It is best 
developed along lines of maximum fracture and minimum 
lateral thrust. There appears to be two bands of maxi- 
mum fracture, one extending along the upper portion of 
