August-September 1922 Vol. XXX, No. 6 



The Journal of Geology 



Supplement to August-September 1922 



Edited By 

 thomas c. chamberlin and *rollin d. salisbury 



With the Active Collaboration of 



STUART WELLER ALBERT JOHANNSEN 



Invertebrate Paleontology Petrology 



EDSON S. BASTIN ROLLIN T. CHAMBERLIN 



Economic Geology Dynamic Geology 



* Deceased. 



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