Taxonomy:
Distinguishing features: 3-rayed D. hamatus
Farinacci & Howe catalog pages: D. triuncinus *
Search data:Tags | LITHS: nannolith-radiate, star-shaped, CROSS-POLARS: 1ou, V-prominent, |
Metrics | Lith size: 0->0µm; |
Geological Range:
Notes: Borowning et al record it as rangig into NN10 but with poorly constrained range due to rare and sproadic occurrence.
Last occurrence (top): in lower part of NN10 zone (30% up, 9.2Ma, in Tortonian stage). Data source: Browning et al 2017
First occurrence (base): within NN9 zone (9.53-10.55Ma, base in Tortonian stage). Data source: Browning et al 2017
Plot of occurrence data:
Browning, E., Bergen, J. A., Blair, S. A., Boesiger, T. M. & de Kaenel, E. (2017). Late Miocene to Late Pliocene taxonomy and stratigraphy of the genus Discoaster in the circum North Atlantic Basin: Gulf of Mexico and ODP Leg 154. Journal of Nannoplankton Research. 37(2-3): 189-214. gs V O Theodoridis, S. (1984). Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. Utrecht Micropaleontological Bulletin. 32: 1-271. gs V OReferences:
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Discoaster triuncinus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-1-2021
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