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Exn~bd 60C <br />Subsidence Evaluation and 2004 Geologic Hazard Field Observations <br />• West Flatiron Lease Area <br />l he notthcm part of the 11est Flatiron Lcasc area consists of nvo steep ridges (containing <br />k+cal rock outcrops of sandstone, siltstone, and shale of the Barren ~7ernber ol'the ~lesaverde <br />homtation) and a steep draw eo~ered with thick colluvium, which supports thick croces of <br />evergreen trees and aspens (Figure 9). <br />• <br />The origin of the nearly vertical linear feature, located on the ridgy alxive the drays (shout the <br />center of image in Figure N- is not positivch• identified. However, this linear feature appears <br />as a lineament (strong linear fcawrcl on the southeast side of the ridge an aerial photos. and <br />Figure 9A. Enlargement of F~gwe 9 to show the I~near <br />`eatu:e that begins on the edge above the draw and ends in <br />the draw located in the approx~ma;e center of the image <br /> <br />Well-vcge[ated landslide deposits (the uneven, hwnmocky ground in the bottom IcR of <br />I~ igurc ~) ore present in the area bars of brush. I his slide area looks similar to the landslide <br />areas to the west on the Juh, 1963 LI.S. Gcoingical Survey aerial photm before I ligh~sa) 133 <br />was built south of the l~onh Fork. <br />837.032 850 Wright Weter Engineers. Ina Page 28 <br />November 2004 <br />therclin•e may he a fracture ur small fault. <br />