Taxonomy:
Distinguishing features:
Parent taxon (Markalius): Circular placoliths with moderately birefringent shields, bright inner tube cycle and narrow or closed central areas.
This taxon: Markalius with very narrow tube cycle and closed central area.
Farinacci & Howe catalog pages: M. walvisensis *
Search data:
LITHS: placolith, circular, CA: closed, CSPH: equant, monomorphic, CROSS-POLARS: V-prominent, R-prominent, rim-bicyclic, |
Lith size: 6->7µm; Data source notes: lith size from OD |
Geological Range:
Last occurrence (top): within NP2 zone (64.81-65.47Ma, top in Danian stage). Data source: (Bernaola and Monechi, 2007)
First occurrence (base): within NP1 zone (65.47-66.04Ma, base in Danian stage). Data source: (Bernaola and Monechi, 2007)
Plot of occurrence data:
Bernaola, G. & Monechi, S. (2007). Calcareous nannofossil extinction and survivorship across the Cretaceous_Paleogene boundary at Walvis Ridge (ODP Hole 1262C, South Atlantic Ocean). Palaeogeography Palaeoclimatology Palaeoecology. 255: 132-156. gsReferences:
![]() |
Markalius walvisensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-2-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=843 Go to Archive.is to create a permanent copy of this page - citation notes |
![]() |
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Comments