GENEEAL GEOGRAPHIC FEATURES 



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starting point. The route of travel followed closely the strike of the 

 Paleozoic strata. 



Geography 



general features 



The Uinta range as an orographic feature is a unit. It is a broad, anti- 

 clinal arch of horizontal or of slightly tilted strata 25 to 35 miles in 

 width and 130 miles in length. The fold is not, however, w-holly sym- 

 metrical, since there are regions of faulting and abrupt change to steep 

 dips. It is limited on all sides by Tertiary strata, which abut against or 



Figure 1. — Sketch Map of Uinta Range and related Areas. 



overlap its slopes except on the west, where it is covered by lava flows 

 Its culminating peaks and ridges extend in an east-west direction along 

 the northern side of the broad summit of the arch. At the eastern end 

 the fold is broad, but broken by sharply compressed folds and faults, 

 while at the western end it narrows to a width of 10 to 13 miles. The 

 plateau-like summit has been deeply dissected and eroded into jagged 

 peaks and ridges having immense amphitheaters at their bases, widening 

 out and then closing into deep glacial-cut canyons through the upturned 



