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: Small to medium sized Eiffellithus coccolith with an axial cross.
Taxonomy:
Farinacci & Howe catalog pages: E. primus *
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: Small to medium sized Eiffellithus coccolith with an axial cross.
Search data:
LITHS: murolith, elliptical, CA: cross-axial, ca_disjunct, plate, process, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
Lith size: 6->8µm; Data source notes: original description & illustrated specimens |
Geological Range:
Last occurrence (top): within Early Valanginian Substage (135.70-137.70Ma, top in Valanginian stage). Data source: Bergen, 1994
First occurrence (base): within Middle Berriasian Substage (139.90-141.40Ma, base in Berriasian stage). Data source: Bralower et al., 1989
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 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 OReferences:
Eiffellithus primus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-9-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10418 Go to Archive.is to create a permanent copy of this page - citation notes |
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