Berggren, W. A.; Aubert, J. (1976). Eocene Benthonic Foraminiferal Biostratigraphy and Paleobathymetry of Orphan Knoll (Labrador Sea). Micropaleontology. 22(3): 327-346.

384006

10.2307/1485255 [view]

Berggren, W. A.; Aubert, J.

1976

22(3): 327-346

Publication

Available for editors   [request]

A benthonic foraminiferal fauna of about 80 taxa is recorded from the Eocene of Orphan Knoll (Labrador Sea). The dominant supraspecific taxa are Cibicidoides (eight species), Anomalinoides (six species), Pleurostomella and Bulimina (five species each), Stilostomella (four species), and Chrysalogonium and Ellipsodimorphina (three species each). The numerically dominant specific taxa include Nuttallides truempyi (Nuttall), Oridorsalis ecuadorensis (Galloway and Morrey), Gyroidinoides girardanus (Reuss), Buliminella grata Parker and Bermúdez, Stilostomella curvatura Cushman, S. aculeata Cushman and Renz, Cibicidoides hercegovinensis (de Witt Puyt), and Bulimina orphanensis, n. sp., described herein. The Stilostomella-Pleurostomella-Nuttallides assemblage suggests deposition at lower bathyal to abyssal depths (1000-2000 m.) and supports an earlier interpretation by geologists of DSDP Leg 12 that Orphan Knoll subsided rapidly to its present depth (1800 m.) during Paleocene time.

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