Nannotax3 - ntax_main - Discoaster brouweri

Citation: Discoaster brouweri Tan Sin Hok 1927

Basionym: Discoaster brouweri * Tan Sin Hok 1927

Distinguishing features:
Parent taxon (D. brouweri group): 6-rayed discoasters without bifurcations, and closely related forms with 3 to 5 rays.
This taxon: Ray tips non-bifurcate but with marked proximal extensions giving it a distinctive concavo-convex form.

Description: Ray tips non-bifurcate and with marked proximal extensions giving it a distinctive concavo-convex form. The distal surface is usually rather smooth, proximal surface more sculpted with proximal boss often present. Probably evolved from D. exilis and first ocurrence is very gradational.

Geological Range:
Notes: Very common NN11-18, the FAD is hard to determine but the LAD is one of the best established biostratigraphic events, see especially Chapman & Chepstow-Lusty 1997.
Last occurrence (top): at top of NN18 zone (100% up, 1.9Ma, in Gelasian stage). Data source: zonal marker (see e.g. Young 1998)
First occurrence (base): within NN9 zone (9.53-10.55Ma, base in Tortonian stage). Data source: Young 1998

References:

Bramlette, M. N. & Riedel, W. R. (1954). Stratigraphic value of discoasters and some other microfossils related to Recent coccolithophores. Journal of Paleontology. 28: 385-403. gs

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

Bukry, D. (1973g). Phytoplankton stratigraphy, Deep Sea Drilling Project Leg 20, Western Pacific Ocean. Initial Reports of the Deep Sea Drilling Project. 20: 307-317. gs

Cati, F. & Borsetti, A. M. (1970). I discoasteridi del Miocene delle Marche. Giornale di Geologia. 36(2): 617-652. gs O

Chapman, M. R. & Chepstow-Lusty, A. (1997). Late Pliocene climatic change and the global extinction of discoasters: an independent assessment using oxygen isotope records. Palaeogeography Palaeoclimatology Palaeoecology. 134(109-125): -. gs

de Kaenel, E. & Villa, G. (1996). Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoeecology from the Iberian Abyssal Plain. Proceedings of the Ocean Drilling Program, Scientific Results. 149: 79-145. gs O

Haq, B. U. & Berggren, W. A. (1978). Late Neogene calcareous plankton biochronology of the Rio Grande Rise (South Atlantic Ocean). Journal of Paleontology. 52: 1167-1194. gs

Kamptner, E. (1967). Kalkflagellaten - Skelettreste aus Tiefseeschlamm des Südatlantischen Ozeans. Annalen des Naturhistorischen Museums in Wien. 71: 117-198. gs O

Martini, E. & Bramlette, M. N. (1963). Calcareous nannoplankton from the experimental Mohole drilling. Journal of Paleontology. 37(4): 845-855. gs

Müller, C. (1974). Calcareous nannoplankton, Leg 25 (Western Indian Ocean). Initial Reports of the Deep Sea Drilling Project. 25: 579-633. gs

Perch-Nielsen, K. (1972). Remarks on Late Cretaceous to Pleistocene coccoliths from the North Atlantic. Initial Reports of the Deep Sea Drilling Project. 12: 1003-1069. gs

Perch-Nielsen, K. (1977). Albian to Pleistocene calcareous nannofossils from the Western South Atlantic, DSDP Leg 39. Initial Reports of the Deep Sea Drilling Project. 39: 699-823. gs O

Salomon, R. (1999). The Calcite Palace. Website - https://ina.tmsoc.org/galleries/CalcitePalace/index.htm. -. gs

Samtleben, C. (1978). Pliocene-Pleistocene coccolith assemblages from Sierra Leone Rise - Site 366, Leg 41. Initial Reports of the Deep Sea Drilling Project. 41(16): 913-931. gs

Singh, P. P. & Vimal, K. P. (1976). Late Miocene-early Pliocene Discoaster from Neill Island, South Andaman. Journal of the Geological Society of India. 17(1): 37-44. gs

Tan Sin Hok, (1927). Discoasteridae incertae sedis. Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen. Sect Sci, 30: 411-419. gs

Theodoridis, S. (1984). Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. Utrecht Micropaleontological Bulletin. 32: 1-271. gs O

Varol, O. & Bowman, A. R. (2024). The new Middle Miocene genus Olladiscoaster, and related and associated discoasters. Grzybowski Foundation Special Publication. 28: 1-102. gs

Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 225-265. gs

Discoaster brouweri

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