7058

• UCREFRP Catalog Number: 7058
• Author: Binns, N. A.
• Title: Effects of Rotenone Treatment on the Fauna of the Green River, Wyoming.
• USFW Year: 1966.
• USFW - Doc Type: Oregon State University,
• Copyright Material: NO

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DESCRIPTION OF STUDY AREA
___ _
.The Green River is located in southwest Wyoming on the west
slope of the continental divide (Figure 1). Parts of three national
forests are included in the drainage area, which covers a wide
variety of geological types in its 10, 000 square miles above Green
. River City (U. S. Geological Survey, 1964). The river originates in_
the rugged Wind River Mountains, the crest of which farms part of
the continental divide. This formerly glaciated area is character-
ized by hard, granitic mountains. Much of the area is above timber
s
line; the lower slopes are covered with a typical coniferous and
f
aspen forest.
The western side of the drainage is bounded by the Wyoming ~'
Range, which is characterized by softer, more easily eroded, rock
types. The basin between the two mountain ranges is typified by
hills and flatlands covered with sagebrush. The southward basin a
gradually develops into the Little Colorado Desert, atypical '•
t
northern scrub desert covered with sagebrush, rabbitbrush, and `
greasewood. Near the Utah-Wyoming state line, the Green River
is fed by streams originating on the forested north slope of the
Unita Mountains, which extend from east to west. These tribu-
taries originate in Utah, flow north into the Wyoming desert area
and swing eastward to the Green River. Below the state line, the
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