HUNTER PARK SPECIAL MAP. 129 
against the Maroon on the south, in the northwestern corner of the area, as 
shown on the map. 
From the Lenado fault there was not discovered any noteworthy break, 
with the exception of the Silver fault, until the southwest corner of the 
district was reached. Here there is a slight break marking the extreme 
northeastern border of the area of complicated faulting which extends 
throughout the whole southern part of the district examined. This area of 
extreme faulting, which is accompanied by a domelike uplift, is best 
developed in the district shown on the Tourtelotte Park special map, m the 
northern part of which it seems to attain it greatest importance. North- 
ward from this point faults are strikingly developed over the whole of 
Aspen Mountain; they are still well marked, but to a shghter degree, on 
Smuggler Mountain, and they die out in the southwestern corner of the 
Hunter Park area. The most northern of these faults observed is seen in 
outcrop on the hill above the St. Joe and Bertha shafts. On this hill the 
contact of the granite and quartzite is offset to the west on the north side, as 
shown by its outcrop, about 200 feet. From this point the outcrop of the 
fault passes into the granite on the east and under the drift covermg on the 
west. In the Alta Argent mine, however, there is cut m the Cowenhoven 
tunnel a fault which is probably identical with the one seen in outcrop in 
the hill, This fault has a displacement to the west on the north side, 
which has been approximately estimated as aggregating 100 feet or so. 
This separation, however, has not taken place along any single plane, for in 
place of a single slipping surface there are many parallel fractures, consti- 
tuting an intensely sheeted zone of some thickness, and the displacement 
has probably been distributed among these separate planes. The fault has 
been located only in these two places, and is represented on the map as 
dying out at both ends—to the east in the granite and to the west in the 
sandstones on the north side of Hunter Creek. In these comparatively 
homogeneous rocks the disturbance could not be followed, and so it can not 
be told whether the fault is actually persistent or not. It seems probable 
that the actual direction of movement along this fault was down to the 
south, combined with some westerly lateral movement on the north side, so 
that on the slipping plane of the fault, which, as shown in the Alta Argent 
mine, is vertical, with a northwest-southeast trend, the movement was 
diagonally down to the southeast on the south side. The lateral movement 
MON XXXI 9 
