88 



TE 



like valley suddenly narrows to a gorge barely w^de enougli for the 

 river to pass through. The road bed has been cut in the side of this 



some 



of them 4 feet in diameter, with smaller bowlders, pebbles, and sand 

 filling the space between them. These materials are cemented into a 

 resistant mass by red oxide of iron, which gives a brilliant color to the 

 whole mass. 



At the west end of this short gorge the red conglomerate 



position. 



Jurassic age, which liave been untm' 



On emerging from the gorge, just before enteruig the town of 



hv 



Devils Slide. 



Elevation 5,314 feet. 

 Omaha 9G9 miles. 



upper part of the Jurassic and crosses Weber Eivor 

 at the point where Lost Creek enters it from the 



To the right also, in the Lost Creek 



right (north), 

 valley, may be seen 



limestone 

 These strati- 



and shale arc manufactured into Portland cement.* 

 fied rocks are all turned up into a vertical attitude. The soft shale 

 is worn away by rain and wind faster than the limestone, which 

 is left stajiding out as ragged vertical waUs. The Devils Slide 



XXV, B) is form 



them 



standing about 40 feet above the general slope of the canyon side. 

 Many other reefs in tliis vicinity are equally prominent, but no others 

 are so conspicuous from the train. 



From Devils Slide westward to Morgan TT 



anire. 



This broad range is by some 

 geographers mcluded hi the Wasatch Mountains, into which it passes 



farther south. 



imcnt 



the Boar River Ransre 



consist of stcei% iiichiied beds of hmestone ^__ 



subordinate amount of shale, ranging in age from"jurasi7on the 



form 



east to Ordovician on the west, (See table on p. 2.) ......... 



tions are aU conspicuously exposed in the precipitous craggTsiderof 

 the canyon and may be seen to best advantage toward the right, in 

 xi . ., ^^ ^^^^ canj^on. West of the town of Devils Slide the 



all 



andstone (Nu^cret sandston 



massive 



age, west of which, and next older, are thin-bedded bright-red shales 

 and sandstones (Aiikareh shale), fossilif erous shalv limestone CThavnes 



The Jurassic limestone and shale of 



this locali 



ture of cement, for which they are well 

 adapted and conveniently located. The 

 rock is blasted from the mountain side in 



plainly visible from the train to 



quames 



assed 



mills, comi 



torn in the form of cement at the rate 

 of about 2,500 barrels a day. The fuel 

 used for the kilns is coal, mined on Grass 

 Creek. Electric power is furnished by 

 streams on the western slope of the 

 Wasatch Mountains and transmitted 

 from generating plants near the base of 

 the range. 



