^M:ERICAlSr 



JOURNAL OF CONCHOLOGY. 



Vol. II. APRIL 1, 1866. No. 2. 



FURTHER OBSERVATIONS ON MR. GABB' 

 PALEONTOLOGY OF CALIFORNIA. 



BY T. A. CONRAD. 



In my observations on some species in Mr. Gabb's " Pa- 

 leeontology of California," I did not intend' to disparage Mr. 

 Gabb's labors; for the work is generally accurate, the plates 

 excellent, and the whole highly creditable to the State of Cali- 

 fornia and to Mr. Gabb. I only intended to call attention to 

 the stratigraphical relations of the upper member of Mr. 

 Gabb's Cretaceous formation, and to suggest that it might be 

 Eocene, as I thought I detected Eocene species in his Division 

 B: especially as he has referred only one exclusively Creta- 

 ceous genus to that division. Of whatever age Division B 

 may eventually prove, whether Cretaceous or Eocene, I am 

 certain that the fossils which I described in the Pacific Rail- 

 road Reports are from an Eocene boulder. 



The only mode of conveying an idea of the stratigraphical 

 position of Division B, is by a geological description, which 

 I presume, will be published in Professor Whitney's Report.. 

 Are the strata distorted or inclined ? or, are they in the form 



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