40
<br /> hogbacks produced by the unequal erosion of upturned alteraatl g
<br />e ce, where the hard quartzite is common, occur sharp cast.ellate
<br /> beds of bard sandstone and soft shale. or_ns similar to those in the Grand Canyon of the Colorado
<br />-
<br /> .
<br />On the south side of the range in the longitude of Vernal the altttd
<br /> of the higher plateau ranges from about 8,000 feet at the front t ' PRINCIPAL STREAMS
<br /> 000 feet where it merges with the old mountain topography of The Duchesne River and its tributaries drain most of the t'inta
<br />about 9
<br /> ,
<br />the central portion of the range. Farther west the altitude reach
<br />Basin in Utah. The main stream is formed by the junction of its
<br />f t
<br />t
<br /> o
<br />000 feet or more. This feature has been described for a par
<br />-North and West Forks at Stockmore, in the northwestern part. of the
<br />10
<br /> ,
<br />outhwestern portion of the range by Lupton." esin. The Forth Fork rises in several small glacial lakes at the base
<br /> S
<br />The top of the plateau sloping gently from the mountains is an or Bald Mountain and Mount Agassiz, two prominent peaks which
<br />ardless Q
<br />tions re
<br />f
<br /> g
<br />orn.a
<br />are 11,947 feet and 12,433 feet respectively above see level. The
<br />old erosion surface that has beveled all the
<br />mo
<br />th
<br />i
<br /> e
<br />n
<br />their hardnes or position. ear the mountain marg
<br />- lakes are from 10,000 to 11,000 feet in altitude, and from them the
<br />s th
<br />ll
<br />l
<br /> ey
<br />va
<br />resistant strata fore:: low ridges bounding longitudina
<br />stream descends rapidly in a southerly course through a glacial
<br />has been covered by4_
<br />f
<br />t
<br />i
<br />i
<br /> ace
<br />canyon
<br />s sur
<br />o
<br />ts junction with the West Fork. The West Fork rises at
<br />occupy the areas of softer rock. Th
<br /> pebbles and boulders _ the base of Heber Mountain, in the Wasatch Range
<br />mantle of coarse gra+ el composed largely
<br />and flows almost
<br /> h
<br />,
<br />red sandstone from the central portion of the range. Fear its out e east for about 20 miles. It. rises at s. lower altitude than the
<br /> margin the plateau is cut by deep canyons, fete of which reach co North Fork; its canyon is also much broader and the topography is
<br /> letely across the plateau so that east west travel along the base ,s rugged.
<br /> p
<br />the range is comparatively easy, whereas along the front of From Stockmore Duchesne River flows southeastward through a
<br />l lower levels there
<br />t b
<br />d
<br /> .
<br />roa
<br />plateau it is practically impossible. At severa
<br />canyon bordered an both sides by high cedar clad ridges.
<br />ll incl.;'
<br />d
<br /> sma
<br />broad gravel-covered bench lands, open valleys, an
<br />11?ut 22 miles below Stockmore Rock Creek enters the main stream
<br /> basins along the principal streams, and these tracts are. estensiv Item the north, and the canyon broadens out as the river skirts along
<br /> used for agriculture. All that portion of the range west of a northe west base of the Blue Bench and swings southward to the town of
<br /> south line passing through the Green River at the mouth of Hen. Duchesne. Here the Strawberry River enters from the west
<br />and the
<br /> ,
<br />Fork has been surveyed topographically by the United States Gee
<br />main stream tapes an easterly course for the next 35 miles through a
<br /> and for topographic details the reader should cony t.„ad valley following the general direction of the trough of the
<br />real Survey
<br /> ,
<br />the Marsh Peak, Gilbert Peak, Hayden Peak, Coalville, Straw be C inta Basin syncline.
<br />In this stretch 'the stream receives Lake Fork
<br />"
<br /> ,
<br />anotber important tributary from the north, entering near the town
<br />Valley, and Vernal topographic maps.
<br />d near the
<br />h
<br />i
<br /> r.
<br />ea
<br />ns
<br />y
<br />'tlvton, and Cottonwood and Antelope Canyons on the south
<br />All the great canyons of the Uinta Mounta
<br /> of the range and descend to the north or to the south. The str
<br />contribute uncertain and intermittent flows.
<br /> flowing to the south constitute the chief source of avatar supply .,. Near Randlett the Uinta River empties into the Duchesne from the
<br /> the Uinta Basin. As the axis of the range is nearer the north than
<br />and the main stream again turns to the southeast and finally
<br /> south margin, the canyons on the north slopes are hotter than t
<br />reaches the Green River a short distance below Ourav. No important
<br /> on the south slopes. All the larger canyons have the character trbutaries enter below the Uinta.
<br /> P lactation. Their upper portions have .been, Rock Creek is the first important . tribute to enter the Duchesne
<br /> cleaned out by ?he ice, but their middle and lower ortions col
<br />P ? belost. Stockmore. It rises in a broad, flat-bottomed, amphithea.tral
<br /> heavy morainic deposits. The streams in these canyons flow .. basin: bounded by precipitous walls and containing 20 or more glacial
<br />
<br />, and as they have lowered their beds, recai et:, among which is the famous Grandaddy Lake. The catchment
<br />the dip of the strata
<br /> considerable. help from the glaciers, they have come to flow across is immediately east of that of the North Fork of the Duchesne
<br /> edges the layers in the great Uinta fold. River and has an average attitude of about 10,000 feet above sea
<br />truncate
<br />
<br />igher cen ntralp ortion of this fold is now soul ture m ` le el.
<br />P It i heavily wooded where there is sufficient soil to permit
<br />The
<br />The.
<br />
<br />many of which rise 12,000 to 13,000 feet ab ,
<br />u•er growth; but it has been so well cleaned out by glaciation that
<br />serlea of peaks
<br /> ,
<br />level, and.ixnto natT O ap,.rs which project into the basin red o -^ these are now continuous areas, square miles-in extent
<br />, share there
<br />= -
<br />
<br />
<br />
<br />
<br />? gl F
<br />r not s ,Ificient loose I3jaterial f6., tr
<br />nnumber OI Gtr^y F+ pa Il ne +'at
<br />ees or s'+^tbs to gain a footiag,
<br />aiga
<br />into a !a
<br />St
<br />de
<br />divide
<br />divide
<br /> - -
<br />?
<br />()'
<br />e H? e co_.:r. u?. w_t 14 miles of its course the stream flows nearly due south
<br />C7eek h
<br />Deep
<br />CT The
<br />:on
<br />r r
<br />V
<br />w " w ae a,t? , ?.F, r rah : I, it s sh a F rp nner gorge
<br />such as is chsractersstic of the canyons
<br />i
<br />-:
<br />f th
<br /> ,
<br />:
<br />sue ?? -
<br />o
<br />e
<br />;? .s P? 4z, p, s , :e r T
|