M-uary 1919 Vol. XXVII, No. i 



E Journal OF Geology 



Edited By 

 thomas c. cffamberlin and rollin d. salisbury 



With the Active Collaboration of 



STUART WELLER ALBERT JOHANNSEN 



Invertebrate Paleontology Petrology 



ROLLIN T. CHAMBERLIN 



Dynamic Geology 



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