Distinguishing features: Small Cruciplacolithus species with non-birefringent (sub)axial cross and wide central area
Original description: Diagnosis: A small species of Cruciplacolithus with an axial cross aligned with, or slightly offset from the major and minor axes of the placolith.
Description: This small placolith has an axial cross which may be aligned with the major and minor axes of the placolith. The cross is only slightly birefringent under polarised light. Four variations of this species are observed. Specimens with the axial cross aligned with the major axes of the placolith may be both bifurcated or plain, and specimens with alignment slightly off the major and minor axes can be both bifurcated or plain. The small size and weak birefringence of the species preclude the consistent identification of these variations.
Farinacci & Howe catalog pages: C. kanungoi *
Morphology: Cross may be aligned with axis or slightly rotated and the cross bars may bifurcate.
|Tags||LITHS: placolith, elliptical, CA: cross-axial, ca_disjunct, |
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
|Metrics||Lith size: 5->7µm; |
Data source notes: size by bracketing holotype size (6µm)
Last occurrence (top): within NN9 zone (9.53-10.55Ma, top in Tortonian stage). Data source: da Gama & Varol 2013
First occurrence (base): within NN7 zone (10.89-11.90Ma, base in Serravallian stage). Data source: da Gama & Varol 2013
Plot of occurrence data:
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