ss 



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THE PALEONTOLOGY OF THE ZORRITOS FORMATION 

 OF THE NORTH PERUVIAN OIL FIELDS 



By EDMUND M. SPIEKER 

 CONTENTS 



PACK 



Introduction I 



Previous work I 



Geology of the Zorritos District 3 



Analysis of the fauna 12 



Systematic Part 



Family Terebridae 35 



Conidae 37 



Cancellariidae 42 



Marginellidae 43 



Buccinidae 45 



Nassidae . .- 48 



Muricidae 51 



Doliidae 52 



Cypraeidae 55 



Cerithiidae 56 



Turritellidae 59 



Naticidae 87 



Turbinidae 91 



Nticulidae 93 



Arcidae 95 



Pectenidae 125 



Anomiidae 127 



Crassitellitidae 128 



Lucinidae 132 



Cariidae 134 



Veneridae 138 



Tellinidae 156 



Psammobiidae . 162 



