THE OVERLAND EOUTE COUNCIL BLUFFS TO OGDEN*. 



81 



Near IVIillis station may be seen to the right (north) great piles of 

 railroad ties that were cut in the mountauis many miles to the south 



and floated dowTi Bear River at times of high water. 

 MiUis. rj.^ ^^^^ j^^£^ (south) are bluffs formed by beds of gravel 



^^^^f ^^.^*^'^^ ^^^' lying: horizontally over the eroded edges of the up- 



Omaha 920 miles. , iit*»i t^-i p • r i 



turned red beds of the Knight formation. These 

 gravels were deposited by the river ages ago, before it had cut its 

 valley down to the level of the present flood plam. 



Just before entering Evanston the road crosses the lines of the Almy 

 and Medicine Butte faults. Between these two faults the rocks are 



-^ 



steeply tilted, and to the left (south) may be obtained a ghmpse of 

 the Almy conglomerates and the Evanston formation, a coal-bearing 

 formation that is best exposed north of the city. 



Evanston is the seat of Uinta County and takes its name from John 

 Evans, a civil engineer, who founded it in 1869. It is a coal-mining 



and commercial center and a division point of the 

 Union Pacific Railroad, with machine shops, icing 

 plants, and other buildings. A branch road connects 

 the city with several mines, some as far north as 

 Almy. The Evanston formation, which contains the 

 principal coal beds of this region, is well exposed in a hill that may 

 be seen to the right, about 2 miles north of the city. Plate XXI, A^ 



Evanston, Wyo. 



Elevation 6,739 feet. 



Population 2,583, 

 O maha 925 miles. 



shows the relations of this formation as seen from Evanston. The 

 type locality of tliis formation is east of Boar Rirer, just north of 



the city, at the locahty shown in Phite XXI, B. Its rocks consist 

 of conglomeratic sandstone, shale, and thick beds of coal. It Hes on 

 the eroded edges of several older formations, indicating that its depo- 

 sition followed a long period of erosion. (See table on p. 75.) 



Six miles west of Evanston the raili-oad crosses from Wyoming into 



Utah. 



J 



T 



Utah has an area of 82,184 square miles and a population of 373,351. 

 The eastern part of the State consists of high plateaus; the western 



part, which lies in the Great Basin/ consists of ranges 



ed moimtains trending in general from north 

 to south, sagebrush-covered hills, wide, nearly level 



Utah. 



allcvs. clear mountain 



The floor 



alluvium washed 



and mountains. 



^ As a general rule coutinental surfaces 

 are drained by streams flowing to the 

 ocean, but there are some exceptional 

 areas which have no outward drainage. 

 The Great Basin (fig. 10) is such an area. 

 It waa so named by Fremont, who was 



its character and extent. It lies near the 



manrm 



surrouji' 



tributarj^ 



bounded 



first 



by the Eocky Mountains on the east and 

 by the Sierra Nevada on the west. It 



92213°— Bull. 612—15 



« 



