84 Explorations in Colorado. [ February, 
After the junction with the Yampah, the Green River continues 
in a cañon for fourteen miles where it passes through the pic- 
turesque palisades of Split Mountain into an open broad valley, 
longitude 109° 15’, latitude 40° 28’, from which point it takes a 
southeast direction through the Wamsitta Valley, where it unites 
with the White River. 
Into both White and Yampah rivers, numerous branches ex- 
tend from either side, forming deep cañons the greater portion 
of their length. We may say in brief, that the sides of the val- 
leys expand and contract, at one time forming the beautiful 
grassy valleys which in olden times were celebrated as the favor- 
ite wintering places for the trappers, or contracting so as to form 
narrow cañons or gorges with walls of varied height. 
The walls of Yampah Cañon average about one thousand feet, 
while the mountains receding back to the northward attain an 
elevation of forty-two hundred feet, and the highest point of 
the plateau on the south side is thirty-four hundred feet above 
the river level. 
Of the plateaus between White and Yampah rivers, Yampah 
Plateau is the largest, and occupies an area of four hundred - 
square miles. The surface of the summit is undulating and on 
the south side it presents a steep face, several hundred feet in 
height, covered with débris, rendering it almost inaccessible. 
This plateau is covered with excellent grass and gives origin to 
numerous springs, all of which dry up within a short distance of 
their source. As a whole, this district is very arid, barren, and 
almost entirely destitute of tree vegetation. 
The total number of stations made by Mr. Bechler in the dis- 
trict assigned to him was forty, and the entire area about three 
thousand square miles. Barometric observations were made 
whenever needed, and about two thousand angles of elevation 
and depression with fore and back sights, so that the material 
for attaining the correct altitudes is abundant. 
The rocks of this district embrace all the sedimentary forma- 
tions yet recognized by the investigators who have studied the 
region that lies between the Park Range and the Great Salt Lake, 
namely, from the Weber Quartzite (which underlies the Carbonif- _ 
erous) to the group or latest Tertiary, inclusive. Not only has — 
the geographical distribution of these formations been mapped, 
but all the displacements of the strata have been traced and 
delineated. The last-named investigations bring out some in- | 
teresting and important facts in relation to the orographie 
geology of the region, especially as regards the eastern termina- — 
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