post- Cretaceous Mountain-making along its course. 191 



the Silurian, Devonian and Carboniferous belts, all which keep 

 their courses and widths, with southeastward and northeast- 

 ward dips of 45°, heeding but little Clayton Peak. Thus, as 

 the map shows, the formations under the mountain-making pres- 

 sure were zig-zagged about and among the Archaean heights. 



The eastward bend abreast of Weber is deeper on the map 

 than in the actual bend, because of the erosion along the 

 Archaean part of the range which has there sunk the surface 

 level to 5090 feet. But the westward bend abreast of Salt 

 Lake City must have projected its head much farther eastward 

 than the map represents; any attempt to complete the curves 

 in the lines makes this evident. The dip of the beds in the 

 gap toward its center from the north and south is 50° to 60°. 

 The map also shows that in the range south of the Lone 

 Peak Archsean area, the Lower Carboniferous (Cb 1 ) is doubled 

 on itself in an anticline having the strike of the mountains — 

 this being shown by the Devonian line along its center. 



The dips of the strata and general facts are given on the 

 Analytical Geological Map between pages 760 and 761 of Mr. 

 King's Report. 



The enormous amount of warping undergone by the Ju- 

 rassic and Cretaceous beds to the eastward is partly indicated 

 by the courses of the outcrops. From the Cambrian outcrop 

 near Weber to Echo Canon, the succession of formations on 

 the map includes the whole conformable series from the Cam- 

 brian (C) to the Laramie (Cr 4 ) ; and from Echo southeastward, 

 there is the reverse of the series, passing from the Laramie group 

 (Cr*), through the successive members in the series to the top 

 of the Uinta Range, as King states on page 586, where are 

 the beds of the Middle Carboniferous (Cb 2 ). The dip is east- 

 ward 25°, 45°, 75° to 70° at Cr 1 , and then 20° at Cr 4 where it 

 is reversed to northwestward in a syncline, and so continues 

 to the summit where it is 4° to 5°. Consequently the warping 

 has put in a syncline at Echo Station. 



The rocks of the Uinta plateau were therefore involved in 

 the system of warping which eventuated in forming the 

 Wasatch Mountains. All the isolated areas of the Cretaceous 

 series over the Wasatch basin also show the warping ; that of 

 the Laramie near Evanston having eastward dips of 25° and 

 45°, and that south of Evanston being an anticline with dips 

 of 80° either side of Cr 2 ; and that east of Evanston, the con- 

 tinuation of the anticline with dips of 60°. The small area 

 of Cretaceous (Cr 1 ) south of Wasatch has dips of 80° west- 

 northwestward, the direction corresponding with that of the 

 beds just south. 



The summit beds of the Uinta plateau dip slightly north- 

 ward and southward, and near the east margin of the map it 



