Laserfiche WebLink
<br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />II. GEOLOGY <br /> <br />Geologic Features <br />The Gore Creek basin, along with the Eagle and Piney Rivers drains <br />the west side of the Gore Range. The Gore Range is one of the major <br />massive uplift sections of Precambrian crystalline rock typical of the <br />mountainous regions of Colorado. The uplifted fault block forming the <br />main element of the range is flanked by metamorphic gneisses and by the <br />sedimentary formations extending westward. The two major faults flanking <br />the Range are the Gore Fault which bears roughly north-northwest and the <br />Frontal Fault which trends approximately paralle1. The Precambrian cry- <br />stalling rocks forming the core of the range are intensely fractured and <br />sub-divided into many small blocks by numerous faults. <br />Gore Fault <br />The Gore Fault can be easily identified in the field as it is highly <br />visible traversing through the area east of the top of Vail Pass, then <br />northwestward through Main Gore Creek just upstream of the confluence <br />with Black Gore. Westward of the fault, the sedimentary rocks of the <br /> <br />Minturn and Maroon Formations are very evident. The Minturn Formation <br />can be identified by the distinctive beds of coarse grained gray.to <br />reddish sandstones, conglomeratic sandstone, sandy and silty shales as <br />well as the pinkish gray to gray limestone beds. <br />Maroon and Minturn Formations <br /> <br />The Maroon Formation conformably overlies the Minturn Formation. <br />The Maroon Formation consists of red mudstone or shale, siltstone and <br />fine-grained sandstone. The Maroon Formation is in depositional con- <br />tact with the granitic Precambrian crystalline rocks near the upper <br />end of the Piney River along the Gore Fault.16 <br />