U. S. GEOLOGICAL PURVEY 



norir'APH XVIII PLATE XXIIl 



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TUREINELLID/E, VULUTID/E, PLEUROTOMID/E, STROMBID/E, TUR RITELL ID/E, PLEUROTnM ARIID/E, AND BULLID/E FROM THE BASE OF 



THE UPPER BED GREENSAND MARLS. 



