3IO A. E. PATH 



usual type, but although he realized that this difference existed, 

 he did not consider its significance in relation to the age of minor 

 folds of the Lost Soldier-Ferris district. 



ECONOMIC CONSIDERATION 



The minor folds of the Lost Soldier-Ferris district are shown 

 above to be distinctly younger than the Rawlins uplift, on which 

 they are superimposed, and the question arises as to the relation 

 of this difference in age to the accumulation of the oil and gas in 

 the Lost Soldier, Wertz, Mahoney, Ferris, and G.P. fields. As 

 the Rawlins uplift was in existence in pre-Wasatch time, it is 

 obvious that any oil and gas that prior to the minor folding of the 

 Lost Soldier-Ferris district had been formed or had migrated a 

 short distance above the margin of the uplift, where the catchment 

 areas of the present fields are situated, must surely have been lost 

 through the eroded edges of the formations on the top of this major 

 uplift. The oil and gas of the present fields and of possible 

 unproved pools in this region must have been formed largely by 

 the dynamo-chemical action of the later deformational forces that 

 caused the minor flexing. Some oil and gas of earlier distillation 

 may have been already present within the catchment areas of the 

 existing fields, but this oil and gas must have been only a fraction 

 of that which was formed within the area embraced by the Rawlins 

 uplift. The oil and gas now available in this district for the use 

 of man must represent, therefore, merely a remnant of the total 

 quantity derived from the mother-material which the rocks of 

 this region originally contained. 



