100 Bulletin of Laboratories of Denison University [Voi. xi. 
in a similar relative position at the mouth of Canon Largo and 
forms the geological cause of the Hell canon mining district. 
These foci of uplift and metamorphism are evidently meta- 
morphic centres also. Taking, first of all that which occurs 
south of the mouth of Coyote canon, we find here that there 
is a boss-like area of quartzite around which the remnants of 
the limestone have clung and these dip in all directions away 
from the centre. To be perfectly accurate we should say rather 
that these points have not settled as much as the adjacent parts 
for here, as elsewhere under the like conditions, the area of 
greatest plasticity has been a little away from the line of great- 
est elevation. In this same area too there is the evidence of 
special secondary metamorphism as there are masses of schist 
of the most various kinds as well as paragenetic diorite. 
The larger focus west of Sandia peak is of essentially simi- 
lar character though there are no remnants of the superposed 
lime. The rock has become a schist of various species and is 
intersected in various directions by large dykes of quartz. The 
most highly metamorphic phase is diorite and the circumstances 
are such as strongly to reinforce the theory long since pro- 
pounded by the writer on the evidence of Lake Superior litholo- 
gy that the diorites are paragenetic and not independent i'gneus 
intrusives. No core of basic eruptive is exposed, though it 
may exist. It is probable that these metamorphic areas are old 
and that they may under favorable conditions produce some 
mineral. The third of these foci in the Hell canon district has 
been quite carefully studied and the results are given elsewhere. 
Here the metamorphism has produced large dykes of quartz 
and diorite, the former carrying some free gold. A little depth 
however soon converts such metal into sulphides and the pres- 
ent prospect is that sufficiently deep mining may yield some 
copper in the form of glance and pyrites. 
The western slope of the Sandias being quite abrupt, the 
face is cut by short canons in the granite with deep dells and 
recesses in which there grow, especially near the summit, a 
number of plants evidently strays from the far north. The 
eastern slope, on the other hand, being quite gradual permits 
