Nannotax3 - ntax_mesozoic - Eiffellithus striatus

Distinguishing features: Medium to large species of Eiffellithus (>6.4µm length) with a wide central-area spanned by diagonal cross-bars.

Citation: Eiffellithus striatus (Black, 1971) Applegate & Bergen, 1988

Basionym: Chiastozygus striatus Black, 1971

Synonyms:

Rothia striata (Black, 1971) Varol & Girgis, 1994;
Tegumentum striatum (Black, 1971) Taylor 1978
Chiastozygus tripes Kothe 1981 [cf. Bralower et al. 1989]

Distinguishing features: Medium to large species of Eiffellithus (>6.4µm length) with a wide central-area spanned by diagonal cross-bars.

Morphology: There appears to continuous variation between the two end-member holotype morphologies of E. striatus and the older (ancestral) E. windii. An arbitrary morphometric cut-off point of 6.4µm coccolith length was suggested by Applegate and Bergen (1989, p.315). Both first and last occurrence of this geographically wide-ranging species are potentially valuable global bioevents.

Most likely ancestor: Eiffellithus windii - at confidence level 2 (out of 5). Data source: Applegate & Bergen 1988.

Geological Range:
Last occurrence (top): at top of BC9 zone (100% up, 132.9Ma, in Hauterivian stage). Data source: Bown et al. 1998 - zonal marker
First occurrence (base): at base of CC4 zone (0% up, 135Ma, in Valanginian stage). Data source: Bown et al. 1998, fig. 5.3

References:

Applegate, J. L. & Bergen, J. A. (1988). Cretaceous calcareous nannofossil biostratigraphy of sediments recovered from the Galicia Margin, ODP Leg 103. Proceedings of the Ocean Drilling Program, Scientific Results. 103: 293-348. gs V O

Black, M. (1971a). Coccoliths of the Speeton Clay and Sutterby Marl. Proceedings of the Yorkshire Geological Society. 38: 381-424. gs

Bown, P. R. & Concheyro, A. (2004). Lower Cretaceous calcareous nannoplankton from the Neuquen Basin, Argentina. In, Villa, G., Lees, J. A. & Bown, P. R. (eds) Calcareous Nannofossil Palaeoecology and Palaeocenographic Reconstructions, Proceedings of the INA9 conference, Parma 2002. Marine Micropaleontology. 52(1-4): 51-84. gs

Bown, P. R. (2005c). Early to Mid-Cretaceous Calcareous Nannoplankton from the Northwest Pacific Ocean, Leg 198, Shatsky Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-82. gs V O

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs

Bralower, T. J., Monechi, S. & Thierstein, H. R. (1989). Calcareous nannofossil zonation of the Jurassic-Cretaceous boundary interval and correlation with the geomagnetic polarity timescale. Marine Micropaleontology. 14: 153-235. gs

Jeremiah, J. (1996). A proposed Albian to Lower Cenomanian nannofossil biozonation for England and the North Sea Basin. Journal of Micropalaeontology. 15(97-129): -. gs V O

Köthe, A. (1981). Kalkiges Nannoplankton aus dem Unter-Hauterivum bis Unter-Barremium der Tongrube Moorberg/ Sarstedt (Unter-Kreide, NW-Deutschland). Mitteilungen der geologischen Institut Universitat Hannover. 21: 1-95. gs

Mutterlose, J. (1992b). Lower Cretaceous nannofossil biostratigraphy off northwestern Australia (Leg 123). Proceedings of the Ocean Drilling Program, Scientific Results. 123: 343-368. gs V O

Taylor, R. J. (1978). The distribution of calcareous nannofossils in the Speeton Clay (Lower Cretaceous) of Yorkshire. Proceedings of the Yorkshire Geological Society. 42: 195-209. gs

Varol, O. & Girgis, M. (1994). New taxa and taxonomy of some Jurassic to Cretaceous calcareous nannofossils. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 192: 221-253. gs

Tags	LITHS: murolith, elliptical, CA: ca_disjunct, plate, process, diagonal cross, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Metrics	Lith size: 6.4->10µm; Data source notes: min size follows Applegate & Bergen (1988); max size from illustrated specimens

Eiffellithus striatus

References:

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