J. B. Hatcher — Geology of Southern Patagonia. 353 



Now, again, if, as Dr. Ameghino states : " The inevitable 

 conclnsion is, that the formation of the great transverse valleys 

 of Patagonia was brought about by great dislocations and 



Fig. 10. Section as displayed in bluffs of coast at Corrikeu Aike about 18 

 miles south of Coy Inlet, showing the bowlder formation occupying angles in 

 the slope of the canon, a. Bowlder formation, b. Santa Cruz beds. 



gigantic faults at a comparatively recent geological period, 

 posterior to the bowlder formation and at the last emergence of 

 the land " : how could these beds of basalt and bowlders now 



Fig. 11. Section as displayed in bluffs of sea coast at mouth of canon about 

 10 miles south of Coy Inlet, showing bowlder formation occupying angles in 

 slope of canon, b. Represents S. C. beds; a. Bowlder formation covered by 

 heterogeneous material of secondary deposition accumulated during the present 

 period of erosion. The dark areas shown in both the above sections in the S. C. 

 beds are composed of discontinuous strata of heavily bedded sandstones enclosing 

 large concretions shown as white areas on the sketch. 



form opposite cliffs of the valleys, as he has stated above? If 

 there are such gigantic faults in this region, surely there should 

 have been ere this some recorded observation concerning them. 

 In so far as 1 know, no one has ever observed any dislocation 



