18 THE DESEADO FORMATION OF PATAGONIA 
the various genera of the Santa Cruz; so that I should put 
the Deseado as far up as possible toward the Santa Cruz. 
The Santa Cruz is above the Patagonian, and I think that 
the Deseado should be put just before the Patagonian; 
that is in the Oligocene, but just what part of the Oligo- 
cene can only be determined when the other faunas have 
been further studied. 
