94 GEOLOGY OF ASPEN MINING DISTRICT, COLORADO. 
separates the blue Leadville limestone from the granite, near the Saddle 
Rock shaft it separates the same limestone from the Silurian dolomite. 
Still farther south this differential movement causes the faulting to become 
so slight that on the mountain side above Queens Gulch there appears to 
be Silurian dolomite on both sides of the fault. 
Along this fault, both in Aspen Mountain and in Tourtelotte Park, 
there has been considerable mineralization, showing that the fault is older 
than the ore deposition. 
Sarah Janefautt——The Sarah Jane fault runs close and parallel to the 
Saddle Rock fault; it is apparently of the same age, and has the same 
characteristics. Like the Saddle Rock, it has formed an important locus 
for the deposition of ores, and like the Saddle Rock, its movement becomes 
progressively less toward the south, while on Aspen Mountain, as above 
noted, it has its maximum throw. This throw, however, diminishes much 
more rapidly southward than does that of the Saddle Rock fault. In 
Section A of the Tourtelotte Park special map (Atlas Sheet XIII) the throw 
seems to be only about 150 feet; in Section B it is only about 100 feet. 
In Section C it appears from the map to have increased to about 300 feet, 
but this apparent increase is due to a local downthrust of the rocks east of 
the fault, in the wedge between the Sarah Jane and Justice faults. Just 
south of Section C, however, the Sarah Jane and Justice faults finally 
come together, and the wedge between them disappears; these faults, after 
uniting, seem to have only a very trifling amount of disturbance, and are 
g; 
not definitely traceable any great distance to the south. 
Justice fault—The Justice fault is so called because of its chief develop- 
ment in the Justice mine in Tourtelotte Park. This is the first north-south 
fault of any consequence to the east of the Sarah Jane. It does not, 
however, belong to the same general series as do the Saddle Rock and Sarah 
Jane faults, and presents certain marked characteristics which put it into a 
different class. Instead of having its greatest development on Aspen 
Mountain and a diminishing throw to the south, it has its greatest develop- 
ment in Tourtelotte Park itself, whence its throw diminishes both to the 
north and to the south. 
In the park its maximum movement seems to be a downthrow of about 
400 feet to the east (Section B, Tourtelotte Park special map). South of 
this the throw diminishes rapidly, so that the null point is apparently 
