Distinguishing features:
Parent taxon (Pseudoconus): Solid, truncated-cone-shaped nannolith with rectangular cross-section constructed from minute, roughly equidimensional crystallites. Possibly a holococcolith.
This taxon: Solid, truncated-cone-shaped nannolith with rectangular cross-section constructed from minute, roughly equidimensional crystallites. Possibly a holococcolith.
See also: Faviconus multicolumnatus ;
Search data:| LITHS: holococcolith, quadrate, |
| Lith size: 4->7µm; Data source notes: original description & illustrated specimens |
Geological Range:
Last occurrence (top): at top of NJ12a subzone (100% up, 164.6Ma, in Callovian stage). Data source: Bown & Cooper 1998 (fig 4) - zonal event
First occurrence (base): at base of NJ11 zone (0% up, 168.7Ma, in Bajocian stage). Data source: Bown & Cooper 1998 (fig 4) - zonal event
Plot of occurrence data:
Bown, P. R. & Cooper, M. K. E. (1989a). Conical nannofossils in the Mesozoic. 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 . 98-106. gs Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 34-85. gs O Bown, P. R., Cooper, M. K. E. & Lord, A. R. (1988). A calcareous nannofossil biozonation scheme for the early to mid Mesozoic. Newsletters on Stratigraphy. 20: 91-114. gs References:

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Pseudoconus enigma compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-8-2026
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10958 Go to Archive.is to create a permanent copy of this page - citation notes |
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