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‘September-October 1921 Ae ab tebe ene) ae a asc 
THE JOURNA e OF GEOL 
EDITED BY 
‘ 
THOMAS C. CHAMBERLIN AND ROLLIN D: SALISBURY a ) 
With the oe Collaboration of 
STUART WELLER, ALBERT ee 
Invertebrate Eales 
EDSON S. BASTIN ~ ROLLIN T. CHAMBE 
Economic Geology y , 
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NAL OF GEOLOGY, the University of Chicago, Chicago, Ill. 
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Entered as Second-class matter, March 20, 1893, at the Post-office at Chicago, Tll., under the Act ° 
Acceptance for sea at special tate of postage provided for in Section 1103, Act of Octob 
July rs, rors. ‘ 
