A Publication of the Society of Economic Paleontologists and Mineralogists 



a Division of 

 The American Association of Petroleum Geologists 



PUBLISHED BY PERMISSION OF SHELL DEVELOPMENT COMPANY 



A DIVISION OF SHELL OIL COMPANY 



EXPLORATION AND PRODUCTION RESEARCH DIVISION 



HOUSTON, TEXAS 



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PHOTOGRAPHY AND PREPARATION OF HALFTONES FOR PLATES BY 

 GRAPHIC ARTS LAB 

 HOUSTON, TEXAS 



COMPOSED, PRINTED BY OFFSET, AND BOUND BY 

 THE COLLEGIATE PRESS 

 GEORGE BANTA COMPANY, INC. 

 MENASHA, WISCONSIN, U.S.A. 



