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



the Santa Cruz beds, and where it is absolutely impossible to 

 mistake the relative position of the series of deposits. As 

 shown in the section given in my original description of these 

 beds, and reproduced here in fig. 6, the beds with marine 

 invertebrates underlie the Shingle formation. 



>o>°°'°,fo 



&Si 



^ ^T-.ca,vg> 



^H~^r-H^=;Z 



R 



x 



Fig. 6. Section near Cape Fairweather showing relations between Cape Fair- 

 weather and Santa Cruz beds, b-d. Santa Cruz beds. d-z. Marine beds, consist- 

 ing below of Cape Fairweather beds and above of the bowlder formation, c-d. 

 Contact between Cape Fairweather and Santa Cruz beds. 



I provisionally correlated the Cape Fairweather beds with 

 certain deposits discovered by Darwin at San Sebastian Bay on 

 the east coast of Tierra del Fuego. Until the fauna of the 

 latter beds is known, it will be impossible to verify the accu- 

 racy of this correlation. The aspect of the very meagre fauna 

 found in them by Darwin, as well as the very considerable 

 increase in thickness to which they attain at San Sebastian, are 

 both important evidences in favor of this correlation ; for as 

 mentioned in my previous paper, all the Tertiary deposits of 



