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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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An ostracode fauna consisting of 10 new species occurs in the uppermost Zemorrian and lowermost Saucesian sections of the lower Rincon Formation, Los Sauces Creek, Ventura County, California. Paracosta and Buntonia dominate the assemblage, which is also represented by "Paijenborchella," Loxoconcha, Acanthocythereis, Asymmetricythere, Cytherura, Xestoleberis, and a new genus.
A predominance of complete carapaces infilled with pyrite and calcite indicates rapid burial in a slightly basic and reducing
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environment. The associated foraminiferal assemblages are mixed and include shelf-edge and lower bathyal (> 6,500 ft or > 2,000 m) markers. Several foraminiferal species in this fauna are characteristic of low-oxygen conditions. An oxygen-minimum zone may also have been the source of pelletal phosphorite in these thin-bedded mudstones. The overall lithologic and paleontologic evidence suggests deposition of these rocks as distal-fringe turbidites immediately following rapid basin subsidence.
Recognition of the ostracode peak zone in uppermost Zemorrian strata 43 mi (70 km) to the west, at Arroyo Hondo, demonstrates its biostratigraphic continuity in this region.
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