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Last modified
7/14/2009 5:02:30 PM
Creation date
5/20/2009 10:52:00 AM
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UCREFRP
UCREFRP Catalog Number
7331
Author
Kinnear, B. S. and R. E. Vincent.
Title
Fishes and Fish Habitats in Black Canyon of the Gunnison National Monument.
USFW Year
1967.
USFW - Doc Type
Fort Collins, Colorado.
Copyright Material
NO
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4 <br />least width at the canyon floor is approximately 40 feet. <br />Access to the river is generally restricted by the terrain to four <br />areas: <br />(1) Eastern boundary section reached via East (River) <br />Portal Tunnel Road. <br />(2) Gunnison Point section reached via foot trail from <br />Gunnison Point overlook. <br />(3) S.O.B. Draw section reached via foot trail from <br />North Rim Campground. <br />(4) Red Rock Canyon section reached via foot trail <br />from Bostwick Park. <br />Although the river can be reached at other places, lateral movement <br />along the river is restricted. Floating through the Monument canyon is <br />nearly impossible, and hiking through is hazardous. <br />Geologically, Black Canyon results from the entrenchment of a pre- <br />historic river in a landscape that has been superimposed upon a modern <br />landscape. The entrenched river eroded into the hard Precambrian rock <br />of the Gunnison uplift. Rocks that form the walls and floor of Black <br />Canyon are of two main classes: "metamorphic rocks transformed by hest <br />and pressure from pre-existing rocks and igneous rocks intruded into <br />the metamorphic rocks as hot molten masses" (Hansen, 1965). These <br />basement rocks are over 1'k billion years old. <br />The uplift stands above most of the surrounding country. As a re- <br />0 <br />cult only minor intermittent tributari <br />in the Monument. Thus, little lateral <br />into the basement or Precambrian rocks <br />proximately two million years ago. To <br />of 2,000 feet, the rate of downcutting <br />per 1,000 years. <br />as drain directly into the river <br />erosion has occurred. Erosion <br />that form B1ack'Canyon began ap- <br />reach its present average depth <br />o <br />has been approximately one foot
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