TOURTELOTTE PARK SPECIAL MAP. 87 
represented by the Justice, is not mineralized; but the faults belonging to 
this system fault the ore bodies as well as the inclosing rocks. The faults 
belonging to the Justice system have apparently a maximum throw close 
to the topographical basim which was originally denominated Tourtelotte 
Park; from this point they disappear gradually toward the south, and more 
rapidly toward the north, so that they are comparatively unimportant or 
wanting in the Aspen special area, and diminish in importance in the south 
half of the Tourtelotte Park special area. A common accompaniment of 
such diminution toward the north is a change in trend, which veers from 
north to northwest, so that the faults of this system approach the Silver 
fault. 
Running directly across the north-south faults is a system of east-west 
faults, which are of much less persistence. Sometimes they traverse only 
the space between two adjacent north-south faults; sometimes, however, 
such a fault traverses two or three north-south faults; and the Butte fault, 
which is a member of this system, cuts through the entire district, even 
across the Castle Creek fault. The intersection of the east-west faults with 
the north-south faults produces a system of blocks; and these blocks have 
been moved one upon the other, so that the resultant structure becomes 
very complicated. Such blocks may have an independent movement which 
is not partaken of by any of the adjoining blocks; again, two or three 
blocks, or even more, may have moved together, having a uniform amount 
and direction of movement with reference to the adjacent mass. The study 
of these faults has made it appear, moreover, that the movement, instead of 
taking place at one time, went on gradually for a very long period, so that 
at a certain stage a block has apparently moved independently with relation 
to the surrounding blocks and at a different time has united with the sur- 
rounding blocks in some more extensive movement. The result of this 
continual up-and-down shifting of the minor blocks is that the throw of any 
persistent north-south fault which traverses these blocks varies considerably 
from place to place, although the general movement of this larger fault 
remains ordinarily the same under all conditions. 
The more important faults will now be described separately, in order 
that the peculiarities of each may be understood as they appear upon pub- 
lished maps, and in order that the general structure of the district may be 
more thoroughly presented. 
