ASPEN SPECIAL MAP. 73 
anticlinal structure; but if this anticline was ever developed in the area 
shown on the Aspen special map, it has been removed by the erosion on 
East Aspen Mountain. 
The faulting has occurred almost entirely subsequent to the folding, and 
is conspicuously best developed in the region where this folding had been 
oreatest, namely, on Aspen Mountain. The Silver fault, which runs through 
the whole mineral-bearing district from northeast to southwest, was proba- 
bly developed at about the time of the folding The other faults of Aspen 
Mountain are more limited in extent, although they are very important. 
Chief among them are certain nearly vertical north-south faults, which are 
parallel to the Castle Creek fault and have an intimate connection with it. 
The Castle Creek fault has its maximum development near the south- 
west corner of the area, in Keno Gulch, its throw being greater there than 
anywhere else in the district. From this point it diminishes both to the 
north and to the south. The heaviest of the north-south faults of Aspen 
Mountain lie nearest to the Castle Creek fault, and as the distance from the 
Castle Creek increases the throw of the parallel faults becomes generally 
less and the persistence north and south diminishes. These Aspen Moun- 
tain faults are apparently of the same age as the Castle Creek fault, all 
having the same trend and all having been formed previous to the ore depo- 
sition; and, like the Castle Creek fault, they have their maximum develop- 
ment on Aspen Mountain. The Castle Creek, the Pride, the Sarah Jane, 
and the Saddle Rock are continuously traced into the Tourtelotte Park dis- 
trict, all of them growing less toward the south and the smaller ones com- 
pletely dying out. In the Schiller fault the diminution toward the south is 
much more rapid, for here the null point is reached at the southern end of 
the Aspen area, and the fault has not been traced into Tourtelotte Park. 
The Aspen fault, which is the slightest and the most easterly of the series, 
apparently dies out more suddenly in both directions, since it has not been 
traced into Tourtelotte Park and does not appear to be important in the 
north end of Aspen Mountain. All these faults disappear under the drift of 
the Roaring Fork Valley to the north, where they have not been explored; 
but they can not be traced on the other side of the valley in Red Mountain, 
and it is probable that they die out in the Maroon sandstones. The throw 
of these north-south faults varies, the Pride and Sarah Jane having a down- 
throw to the east, while the Castle Creek and the Schiller have a downthrow 
