J. B. Hatcher — Cape Fairweather Beds. 



247 



guished by the fossils it contains. Both the sandstones and 

 conglomerates are fairly continuous, but the latter are 

 frequently intruded into the former, and the sandstones some- 

 times entirely replace the conglomerates. In both, marine 

 invertebrates are quite abundant, and according to Professor 

 Henry A. Pilsbry they point to a Pliocene age for the beds. 





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These beds are of interest as being the first instance of a 

 marine formation overlying the fresh water Santa Cruzian 

 formation, in regard to the age of which there has been so 

 much doubt ; unfortunately, however, they promise to be of 

 little service in determining the age of the latter. It is quite 

 probable that they may aid in correlating certain marine beds 

 of Parana, discovered long ago and referred by Darwin, 

 D'Orbigny and others to the Patagonian beds, but now 

 known to be of much more recent origin. At present I 

 believe them the equivalent of those beds discovered by Dar- 

 win in northeastern Tierra del Fuego and provisionally 

 referred by him to the mammalian beds (Santa Cruzian beds) 



