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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Fifty-three samples of a late Miocene marine diatomite were processed for silicoflagellates. Four genera and 13 species: Cannopilus schulzi, Dictyocha aspera, Dictyocha fibula, Dictyocha pentagona, Dictyocha pseudofibula, Distephanus boliviensis, Distephanus quinquangellus, Distephanus speculum, Mesocena diodon, Mesocena elliptica, and Mesocena polyactus were found. Counts were made of the species present and relative and total abundances were calculated. Two biostratigraphic zones (in ascending order), Dictyocha pseudofibula Acme-Zone and Distephanus speculum Acme-Zone were recognized. These zones appear to correlate to Bukry's Dictyocha pseudofibula Zone and Distephanus speculum Zone from DSDP Leg 18, Site 173, in the northeast Pacific. These zones overlap Barron's Nitz hia fossilis Partial-Range-Zone, Rhaphoneis amphiceros var. elongata Partial-Range-Zone, and Nitzchia reinholdii Concurrent-Range-Zone.
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