Art. IX.] Herrick Johnson, Geology of the Albuquerque Sheet. 185 
spur with its numerous peaks is schist of various descriptions 
much seamed and veined with quartz. Somewhat extended 
search has failed to discover any true igneous rocks in the vicin- 
ity. The schists are largely hornblendic with chlorite alter- 
ation phases, but there are mica and hydro-mica phases and 
gneisses. The contact with the granite of the foot of the San- 
dias is not simple but there is a large area of slicken-siding and 
evidence of disturbance. Further north the fault cut off part of 
the Permo-carboniferous and superjacent strata and dropped 
them in various positions 4000 feet or more and the whole 
northern part of the range was shattered. The metamorphism 
was excessive. Essentially the same sequence of strata is 
found here as near the mouth of Coyote canon further south and 
the coal measure limestone with its typical fossils is found near 
the base of the limestone series while the red beds follow in or- 
derly succession as will be explained in connection with the San 
Pedro sheet. The fauna of the Permian is nearly obliterated by 
metamorphism, but traces remain. It would be expected that 
if the limestone originally contained lead there would be some 
segregation and along or near the contact of the lime and gran- 
ite some mining operations have been carried on with indifferent 
results so far and there is little reason to expect much. The 
possibilities of copper would seem to be good theoretically but 
we have so far seen no evidence that the Jurassic or Permian 
has segregated copper within reach, though copper is report- 
ed. In the schists the numerous quartz veins have been opened 
here and there, chiefly in places where the decomposition of 
hornblende has produced a quantity of chlorite. In the absence 
of further information it would look as though the prospectors 
had mistaken chlorite for stain of copper or silver as often hap- 
pens in this region. The veins are very white and clean and 
have what a miner calls a “ hungry look ” but very likely carry 
some traces of gold. The association is however distinctly un- 
favorable unless there are basic intrusives that eluded our search. 
Such intrusives occur in Hell canon farther south. Tourmaline 
is the most common of the accessory minerals of the schists 
