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PROCEEDINGS OP THE CALIFORNIA 



On studying the foregoiug table, the following deductions present themselves : 

 1st, that the rocks of the upper division, at the various localities quoted, are 

 all of the same geological age ; and 2d, that they are intimately connected 

 with the older groups by a passage of nearly a fifth of all the contained species 

 of fossils from this, either into the intermediate beds, or into the lower group 

 itself. 



In anticipation of a possible objection that may be raised here, it will prob- 

 ably be as well, before going further, to state that in the Division B, there has 

 been no confounding of two groups. The same grouping of species extends to 



