Marble - Colorado Geological Survey

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plex western margin of the Sawatch Uplift
takes a pronounced change in strike. Intrusive
rocks and associated Ag, Pb, and Zn mineralization
have been localized where this major
change in the trend of the west margin of the
Sawatch Uplift intersects the Colorado mineral
belt (Figure 9).
The Elk Mountains are a northwest trending
offshoot from the asymetrical western limb
of the large Sawatch Range uplift. During the
Laramide Orogeny, it is postulated that a sequence
of Paleozoic-Mesozoic rocks, on the
Figure 7:
White marble from the
southern end of the
Colorado-Highland
property. White marble
tends to contain less
pyrite than do the gray
marbles. Green mineral
is probably chlorite.
Number in photo correlates
with descriptions
in Appendix A.
l(o
Figure S.­
Gray marble from the
Colorado-Highland
property. Note variable
grain size and color
variation. Some pseudobanding
is visible in
sample. No original
bedding features
discernible. Number in
photo correlates to
sample number in
Appendix A.
order of 2.5 to 4.0 miles in thickness, slid to the
southwest off of the emerging Sawatch Range
Uplift (Bryant, 1966, 1979). The plane of movement,
known as the Elk Range Thrust, was
probably a bedding plane fault in the Belden
Formation. Direct field observation of the
thrust fault is limited due to Tertiary intrusive
rocks which have been emplaced along the fault
plane in many locations. Where exposures are
sufficient, as in the Conundrum Creek window,
non-deformed, structurally simple upper plate
rocks unconformably overly highly folded and
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