Fifteen well-preserved species of Bolboforma were observed in samples of late middle Miocene to early Pliocene age from Sites 642 and 643 on the Voring Plateau (Leg 104). Seven assemblage zones are defined, dominated by Bolboforma costairregularis, B. intermedia, B. metzmacheri, B. laevis, B. fragori, B. compressispinosa, and B. reticulata, respec tively.
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