ASPEN SPECIAL MAP. A 
however, there is found along this line a marked north-south fault, nearly 
vertical, which has an upthrow on the east side of about 30 feet. This 
probably is the representative of the Clark fault. In the mapping, how- 
ever, it is represented that the Clark fault, owing to its difference in dip 
from the Silver fault, passes into this latter fault and is lost, so that at the 
surface only a single fault outcrops, as indicated. The Clark fault along 
its entire course may be regarded as a movement which has taken place 
mainly along the Silver fault; locally, however, the plane of movement 
deviated slightly from the preexisting fault plane. 
In the Mollie Gibson and Smuggler mines, where the Clark fault has 
operated, there is present an apparently new set of faults belonging to the 
Della system, along which ore has been deposited. The ore shoots were, 
therefore, formed subsequently to these faults (which are called, in the 
Mollie Gibson mine, the Gibson and the Emma), as they were formed 
subsequently to the Della and Smugeler faults in Smuggler Mountain 
proper. The movement along the Clark fault which displaced the ore 
shoots must, therefore, have displaced the faults belonging to the Della 
system, and the amount of movement, as shown by the ore bodies, is very 
nearly or exactly that by which the Della and Smugeler faults are 
separated from the Gibson and Emma. The facts seem to indicate that 
the Gibson and Emma faults were originally identical with the Smuggler 
and the Della, and that they have been separated by the cross-cutting Clark 
fault at the same time as were the ore bodies. Along the Clark fault in 
the Mollie Gibson mine the breccia contains many fragments of ore. 
RESUME OF STRUCTURE ON SMUGGLER MOUNTAIN. 
The beds on Smuggler Mountain dip uniformly and steeply to the 
west, and’have been broken by three distinct sets of faults. The first set 
is represented by the Silver fault, which is nearly parallel to the bedding, 
and which was formed previous to the period of ore deposition and also 
previous to any of the other faults. The second set is represented by the 
Della fault, which is later than the Silver fault, as is shown by the fact that 
it faults this fault wherever it intersects it, and which originated previous to 
the ore deposition, but continued developing subsequent to that period, and 
is probably still growing slightly. The third set arose from movement 
along the plane of the Silver fault, which took place locally in planes 
