Distinguishing features:
Parent taxon (Eprolithus): Moderately tall, circular to stellate, multiradiate nannoliths with 5-9 petaloid wall-cycle elements surrounding a wide central area spanned by a median diaphragm. Typically H-shaped in side view.
This taxon: Circular eprolithid nannolith with narrow wall, wide diaphragm and relatively large central perforation.
Taxonomy:
Farinacci & Howe catalog pages: E. antiquus *
Distinguishing features:
Parent taxon (Eprolithus): Moderately tall, circular to stellate, multiradiate nannoliths with 5-9 petaloid wall-cycle elements surrounding a wide central area spanned by a median diaphragm. Typically H-shaped in side view.
This taxon: Circular eprolithid nannolith with narrow wall, wide diaphragm and relatively large central perforation.
Morphology:
Differs from younger species of Eprolithus and Radiolithus in having a large perforation through the centre of the diaphragm and by a disjunct stratigraphic range (early Hauterivian, vs. early Aptian).
LITHS: nannolith-radiate, circular, cylindrical, CA: vacant, CROSS-POLARS: T-prominent, |
Lith size: 5->8µm; Segments: 10->12; Data source notes: illustrated specimens |
Geological Range:
Last occurrence (top): at top of BC7 zone (100% up, 131.5Ma, in Hauterivian stage). Data source: Bown et al. 1998 - zonal marker
First occurrence (base): at base of BC7 zone (0% up, 132.4Ma, in Hauterivian stage). Data source: Bown et al. 1998 - zonal marker
Plot of occurrence data:
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 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 Perch-Nielsen, K. (1979). Calcareous nannofossils from the Cretaceous between the North Sea and the Mediterranean. In, Weidmann, J. (ed.) Aspekte der Kreide Europas. International Union of Geological Sciences Series A . 6: 223-272. gs O Varol, O. (1992). Taxonomic revision of the Polycyclolithaceae and its contribution to Cretaceous biostratigraphy. Newsletters on Stratigraphy. 27(93-127): -. gsReferences:
Eprolithus antiquus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 10-12-2024
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