POCATELLO, IDAHO, TO SALT LAKE CITY, UTAH. 



ITINERARY. 

 Bv a. K. Gilbert. 



Station. 



Pooatello 



Portneuf 6 



McCainmoii 23 



Thatcher 34 



Oxford 53 



Battle Creek 04 



Cache .1 unction 86 



Cullinston 92 



Dis- 

 tance. 







10 



37 



66 



85 



102 



137 



148 



Elevation. 



Station. 



4,400 

 4,495 

 4,753 

 4,818 

 4, 771 

 4,490 



4,689 



1,360 



1,370 

 1,449 

 1,408 

 1, 455 



1.30S 



1,429 



Dis- 

 tance. 



Dewey 97 



Brlgham 113 



I'tal. Hot Springs.... 126 



Ogdcn * 134 



Kaysvillc 161 



Lake Bbore L58 



Salt Lake Citv i 170 



166 

 182 



202 

 216 

 248 



254 

 •.'71 



Elevation. 





4,818 



4, 313 

 4, 275 

 4,301 



1,316 



1,315 

 1,303 

 1,811 



4,298 ; 1,310 



4,228 1,289 



• Population, 14.899. I Population, 44,848. 



From Pocatello the railroad Line runs a few miles eastward up the 

 narrow defile of the lower Portneuf valley, then bends southward, fol- 

 lowing for 35 miles (56 km.) the broad Pleistocene valley of Marsh 

 creek. In the middle of these valleys, and sometimes filling their bot- 

 toms so as to block up the mouths of the tributary ravines, are recent 

 Hows of basaltic lava. 



.Marsh valley lies between parallel mountain ranges trending with the 

 meridian and consisting, so far as known, of Paleozoic rocks. They 

 may be considered as northern members of the Wasatch chain. They 

 belong to an ancient topography whose drainage system has been con- 

 siderably modified in geologically recent time. The Portneuf river 

 breaks into the valley from the east at 'ft point about midway, follows 

 it to its northern end, and escapee by the defile just mentioned. Late 

 in Tertiary or early in Pleistocene time a How of basaltic lava followed 

 the course of the river into the valley. Subsequent erosion, chiefly by 

 the outlet of Lake Bonneville, lowered the drainage system of the val- 

 ley so that the basaltic coulee stands at the top of a steep sided mesa. 

 The Bonneville channel follows the western margin of this mesa, and 

 the Portneuf river follows the eastern, breaking across it at the north- 

 ern end of the vallev. The train follows the river for several miles, then 



377 



