Rhagodiscus indistinctus

Distinguishing features:
Parent taxon (Rhagodiscus): Loxolith coccoliths with low rim and central-area filled by a granular plate which may be perforate and/or spine-bearing. In xpl the rim is unicyclic moderately bright, the central area is granular, lacking a clear extinction cross.
This taxon: Medium to large elliptical rhagodiscid-like coccolith with moderately broad rim and narrow central area spanned by a spine (base). Rim is unicyclic in XPL and overall the coccolith exhibits low birefringence.

Taxonomy:

Farinacci & Howe catalog pages: R. indistinctus *

Distinguishing features:
Parent taxon (Rhagodiscus): Loxolith coccoliths with low rim and central-area filled by a granular plate which may be perforate and/or spine-bearing. In xpl the rim is unicyclic moderately bright, the central area is granular, lacking a clear extinction cross.
This taxon: Medium to large elliptical rhagodiscid-like coccolith with moderately broad rim and narrow central area spanned by a spine (base). Rim is unicyclic in XPL and overall the coccolith exhibits low birefringence.

Morphology:

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Lees & Bown 2005 - consistently present to end Cret
First occurrence (base): within Early Campanian Substage (80.60-83.65Ma, base in Campanian stage). Data source: Burnett 1998

Plot of occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Rhagodiscus indistinctus, synonyms included - Rhagodiscus indistinctus;
• See also space-time plot :: Samples map :: Parent: Rhagodiscus

Rhagodiscus indistinctus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-9-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11023 Go to Archive.is to create a permanent copy of this page - citation notes

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