Distinguishing features:
Parent taxon (Eiffellithus): Loxolith coccoliths with a prominent inner rim cycle that is birefringent and conspicuous in cross-polarised light; this cycle is broader than the outer rim cycle. The central area is spanned by variably-orientated cross-bars.
This taxon: Medium to large species of Eiffellithus (>6.4µm length) with a wide central-area spanned by diagonal cross-bars.
Taxonomy:
Farinacci & Howe catalog pages: C. striatus * , C. tripes *
Distinguishing features:
Parent taxon (Eiffellithus): Loxolith coccoliths with a prominent inner rim cycle that is birefringent and conspicuous in cross-polarised light; this cycle is broader than the outer rim cycle. The central area is spanned by variably-orientated cross-bars.
This taxon: Medium to large species of Eiffellithus (>6.4µm length) with a wide central-area spanned by diagonal cross-bars.
Morphology:
Most likely ancestor: Eiffellithus windii - at confidence level 2 (out of 5). Data source: Applegate & Bergen 1988.
Search data:LITHS: murolith, elliptical, CA: diagonal cross, plate, process, ca_disjunct, CROSS-POLARS: R-prominent, V-prominent, rim-bicyclic, |
Lith size: 6.4->10µm; Data source notes: min size follows Applegate & Bergen (1988); max size from illustrated specimens |
Geological Range:
Last occurrence (top): at top of BC9 zone (100% up, 129.1Ma, in Hauterivian stage). Data source: Bown et al. 1998 - zonal marker. LAS is shown as earlier in the Tethyan realm - ca 0.8 up in CC4
First occurrence (base): at base of CC4 zone (0% up, 133Ma, in Valanginian stage). Data source: Bown et al. 1998, fig. 5.3
Plot of occurrence data:
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 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 O Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Lower Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 86-131. gs O 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 Crux, J. A. (1989). Biostratigraphy and palaeogeographical applications of Lower Cretaceous nannofossils from north-western Europe. In, Crux, J. A. & van Heck, S. E. (eds) Nannofossils and their applications: Proceedings of the 2nd INA Conference, London 1987. British Micropalaeontological Society Publication Series . 143-211. 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 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. (1988). Das kalkige Nannoplankton des NW-Deutschen Valangin und seine paaozeanographische Deutung. (Calcareous nannoplankton of the NW-German Valanginian and their paleoceanographic meaning.). Berliner Geowissenschaftliche Abhandlungen. 175-209. gs Mutterlose, J. (1992). Lower Cretaceous nannofossil biostratigraphy off northwestern Australia (Leg 123). Proceedings of the Ocean Drilling Program, Scientific Results. 123: 343-368. gs 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 Thomsen, E. (1987). Lower Cretaceous calcareous nannofossil biostratigraphy in the Danish Central Trough. Danmarks Geologiske Undersøgelse. 20: 1-89. 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. gsReferences:
Eiffellithus striatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 5-11-2024
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