HUNTER PARK SPECIAL MAP. 131 
Third. Next came the development of east-west faults, which seem to 
be referable to two divisions The Lenado fault is apparently referable 
to a distinet fault district which begins at the northern part of the Hunter 
Park area and extends northward. The southern division begins with the 
Alta fault, the extreme outlier of the complicated faulting which is central- 
ized in the Tourtelotte Park area. All these faults have a general east-west 
trend, although no two of them are strictly parallel. The Lenado and the 
Alta faults are nearly vertical, but differ in trend, while the Della is a flat 
fault, pitching to the south. In point of age these three faults seem to be 
nearly alike, all of them having had an important movement since the ore 
deposition, and so being in large part postmineral. The Della, however, as 
will be shown, existed as a well-marked fault previous to the ore deposition, 
while the Alta fault appears to have been very slightly developed at this 
time, and there is no evidence that the Lenado fault even originated before 
the mineralization. 
DESCRIPTION OF SECTIONS. 
(ATLAS SHEET XVIII.) 
Section A——On the east side of the section the beds flatten to correspond 
with the Lenado fold, and the various formations are well exposed in 
outcrop. The Silver fault in this section separates the Leadville dolomite 
from the Weber formation. The contact of Maroon and Weber is well 
shown in outcrops, and from this contact west there is nothing but Maroon 
beds in the section. The Lenado fault has been calculated to occupy 
about the position shown. 
Section B—he whole eastern part is in granite. On the hills along this 
section, especially on the western part, there is much drift covering, but 
the drift has been represented only in the valley of Hunter Creek, while the 
rest of the area is represented by its bed rock. 
The hill just west of Hunter Creek is shown in Pl. XV, and has 
already been described. In the gulch west of it the Silver fault crops, and 
a little west of this the Badger mine has gone down to the fault. On this 
hill there outcrops above the granite the Cambrian quartzite, which is 
overlain by the Silurian dolomite. The dolomite is here quite thin, and 
is separated from the Weber shales by the Silver fault. The thickness of 
shales in this section appears to be abnormally slight, but whether this is 
due to the action of the Silver fault or to original deposition can hardly 
be stated. The whole western end of the section is in the Maroon red beds. 
