Uniplanarius clarkei

Distinguishing features:
Parent taxon (Uniplanarius): Stellate (triradiate or tetraradiate) nannoliths with three or four ray-like elements; there may be a small central diaphragm.
This taxon: Small, square Uniplanarius with rounded corners, formed from four blocks joined along axial sutures that are marked in XPL by relatively broad zones of darker birefringence, together resembling the blades of a propeller. The outer edges of the nannolith may show slightly higher birefringence.

Taxonomy:

Farinacci & Howe catalog pages: U. clarkei *

Distinguishing features:
Parent taxon (Uniplanarius): Stellate (triradiate or tetraradiate) nannoliths with three or four ray-like elements; there may be a small central diaphragm.
This taxon: Small, square Uniplanarius with rounded corners, formed from four blocks joined along axial sutures that are marked in XPL by relatively broad zones of darker birefringence, together resembling the blades of a propeller. The outer edges of the nannolith may show slightly higher birefringence.

Geological Range:
Last occurrence (top): within Late Maastrichtian Substage (66.04-69.91Ma, top in Maastrichtian stage). Data source: Lees & Bown 2005
First occurrence (base): within Early Campanian Substage (80.64-83.64Ma, base in Campanian stage). Data source: Lees & Bown 2005

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: Uniplanarius clarkei, synonyms included - Uniplanarius clarkei;
• See also space-time plot :: Samples map :: Parent: Uniplanarius

Uniplanarius clarkei compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-9-2023 Taxon Search: Advanced Search Short stables page link: https://mikrotax.org/Nannotax3/index.php?id=11287 Go to Archive.is to create a permanent copy of this page - citation notes

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