Taxonomy:
Distinguishing features:
Parent taxon (Amaurolithus): Ceratoliths non-birefringent or only weakly birefringent
This taxon: Like A. delicatus but shorter arms.
Farinacci & Howe catalog pages: A. brevigracilis *
Search data:
LITHS: nannolith-other, horseshoe-shaped, CROSS-POLARS: 1ou, V-prominent, |
Lith size: 0->0µm; |
Geological Range:
Last occurrence (top): within NN14 zone (3.92-4.13Ma, top in Zanclean stage). Data source: Blair et al 2017
First occurrence (base): within CN9b subzone (6.91-7.42Ma, base in Tortonian stage). Data source: Blair et al 2017
Plot of occurrence data:
Blair, S. A., Bergen, J. A., de Kaenel, E., Browning, E. & Boesiger, T. M. (2017). Upper Miocene-Lower Pliocene taxonomy and stratigraphy in the circum North Atlantic Basin: radiation and extinction of Amauroliths, Ceratoliths and the D. quinqueramus lineage. Journal of Nannoplankton Research. 37(2-3): 113-144. gs OReferences:
Amaurolithus brevigracilis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-1-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1552 Go to Archive.is to create a permanent copy of this page - citation notes |
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