48 



GE0L0G1 OF THE DENVEK BASIN. 



foothi] 



in a \v 

 which, 

 bend t 

 tion. 



the <>tl 

 slio\ e, 



tress is 



which 

 with i 



it won 



Is, and here it is easj to conceive of a horizontal shove of the strata 

 estward direction againsl the unyielding buttress of Archean rocks, 



;i slighl initial upward curve of the beds being presupposed, would 

 he bods in immediate proximity to the buttress into a vertical posi- 

 The condition of things on the Turkey Creek or Morrison lino, on 

 ier hand, is loss readily conceived as the result of ;i simple horizontal 



for between the vertical Laramie sandstones and the Archean but- 

 i the greal thickness of sofl clays of the Middle Cretaceous, under 

 come the hard, unyielding Dakota sandstones at an angle of l."> , 

 ilier sandstones and clays In-low them at a still lower angle, and 

 Id seem that the horizontal shove would induce a sliding upward 



E - 



' ' ~ - ' v ' ' - '' -'/'_"■ C- 



Ri iton TOrthruat i.mli near Boulder Peak. 



of the upper beds over the more gently inclined lower series, instead of 

 bending the former almost al a right angle, as they appear to have been 

 bent, unless there were some force to hold them down. 



If one examines the curve of the beds at the bend, on the sheet of 

 cross-sections (see PL [V), which have been mosl carefully constructed from 

 measured dips at many points and represent the most probable form ol the 

 curve of the strata underground that can be, deduced from facts that 

 actually come under observation, it will be seen thai the most probable 

 direction of a force which would make such a curve would be one acting at 

 an angle of l. r > with the horizon, or in the general direction of the arrow 

 iii diagram b, I'm'. I. Such a force mighl be considered as the resultant 



