PERMFILE47750

• Permit No: C1981026
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: GENERAL DESCRIPTION OF GEOLOGY AND HYDROLOGY
• Section_Exhibit Name: APPENDIX C - PART 1 0F 3
• Media Type: D
• Archive: No

• APPENDIX C
GENERAL DESCRIPTION OF GEOLOGY AND HYDROLOGY
General Geology
Stratigraphy and Structure.
The general geology of the North Park region has been well
established by numerous United States Geological Survey investi-
gations, the most notable of which are Beekly (1915), Hail
(1965, 1968) and Kinney (1970, 1971).
The North Park region can be geomorphically classified as an
intermontane area, enclosed by the Medicine Bow Range to the east,
the Park Range to the west and the Rabbit Ears Range to the south.
The resultant structural basin, which is truncated to the north by
the Independence Mountain Fault, contains sediments ranging in age
• from Triassic to Quarternary. These sediments are approximately
15,000 feet in total aggregate thickness. Late Cretaceous and
Early Tertiary sediments account for almost all of this total.
Figure 1 shows the North Park Coal Field in relation to other coal
basins in Colorado. Figure 2 is a generalized stratigraphic column
of the North Park Coal Fie13.
In addition to the broad synclinal fold which formed the
overall structural basin of the North Park region, considerable
local folding and faulting has also occured. These local folds
and faults are probably the result of compression caused by the
formation of the larger synclinal trough. The McCallum Anticline
is one of these local folds. Geographically, the McCallum Anticline
lies between the Michigan and Canadian Rivers east of the town of
Walden. Structurally, the anticline can be categorized as doubly
plunging and assymmetrical about its axis. To the north, where
the anticline plunges northwest, the strike is approximately N?SoW.
To the south, the structure begins to change strike as the crest of
the anticline plunges almost due south. E:;cept near both noses,
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