1 IG 



uicouxn of this i>kn\ ish basin. 



: ■ i i I < ' I i jusl north of iIh' cniss ridge, an actual break is recognized in the Red 

 I'.i! , Inviii" i:i|iiill\ developed from what was ;it first Imi a alight fold or 

 di placemenl of the beds in the eastward to a condition in which the strata 

 mi either side of the fault have become strongly divergent, I >< >i 1 1 in strike 

 and in the dogree of dislocation along the fault plane. This divergence 

 continues to increase to the northward until the summil of the peak is 

 reached, when the beds on the i\\<> sides of the fault become parallel in 

 trend and so continue well toward the northern end of the disturbed area, 

 The northern end of the rent, so far as the sodimontaries are concerned, 

 uu\ bo regarded as open, the beds on either side of the fault, through 

 the agencj of erosion, failing to join. 



The fault is apparently the result of the forces of compression acting 

 at the time of the general uplift of the Colorado Range, Traces of this 

 * ;i 1 1 \ crumple are still \isil>le in the southern face of the South Houldrr 



Peaks, the strata upon the west of the faull plane showing an upward bend, 

 those to the oast of the plane with their possible downward flexure having, 

 In iw e\ or, I teen er< m lei I 



,\n.,u .r. a The basis of faull classification is a satisfying definition 



of the several t\|iesot' tr.ietiire which are recognized as existing, There 

 is, even al tho presenl day, a hick of precision in this pai'ticular, ami it is 



desirable, in connection with the discussion of the fault, to slate the manner 



in which the ordinal*} descriptive terms are employed in this report. The 



three terms "normal," "vertical," and "reverse" are here based upon ihe 



position of the fault plane with reference to the lines of stratification in the 

 South Moulder Peaks, and the relative movement <>i the beds on either side 

 of the plane with reference to a single stratum. Ordinaril} the inclination 

 of di,. fault plane is referred to the earth's horizon or to a line vertical to 

 it a distinction between "normal" and "reverse" faults that will not hold 

 for all cases, 



