Distinguishing features: Small (4-5.5 µm), broadly elliptical, with narrow central area spanned by a small axial cross.
deKaenelBergen 93 pl2 09.jpg
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deKaenelBergen 93 pl2 11.jpgTaxonomy:
Farinacci & Howe catalog pages: Similiscutum cruciulus *
Distinguishing features: Small (4-5.5 µm), broadly elliptical, with narrow central area spanned by a small axial cross.
Search data:| Tags | LITHS: placolith, elliptical, CA: cross-axial, process, closed, V-UNITS: V-prominent, DETAILS: rim-unicyclic, |
| Metrics | Lith size: 4->5.5µm; Sources: Mattioli et al. 2004 |
Geological Range:
Last occurrence (top): in lower part of NJT7a subzone (20% up, 180Ma, in Toarcian stage). Data source: Mattioli & Erba 1999
First occurrence (base): at base of NJ4a subzone (0% up, 190.2Ma, in Pliensbachian stage). Data source: Bown & Cooper 1998 (fig 4) - zonal event
Plot of occurrence data:
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 :: :: de Kaenel, E. & Bergen, J. A. (1993). New Early and Middle Jurassic coccolith taxa and biostratigraphy from the eastern proto-Atlantic (Morocco, Portugal and DSDP Site 547B). Eclogae Geologicae Helvetiae. 86(861-907): -. gs :: view :: open Mattioli, E. & Erba, E. (1999). Synthesis of calcareous nannofossil events in Tethyan lower and middle Jurassic successions. Rivista Italiana di Paleontologia e Stratigrafia. 105(3): 343-376. gs :: :: Mattioli, E., Pittet, B., Young, J. R. & Bown, P. R. (2004). Biometric analysis of Pliensbachian-Toarcian (Lower Jurassic) coccoliths of the family Biscutaceae: intra- and interspecific variability versus palaeoenvironmental influence. 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): 5-27. gs :: :: References:
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Similiscutum cruciulus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 10-7-2020
Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11086 Go to Archive.is to create a permanent copy of this page - citation notes |