Taxonomy:
Distinguishing features: Similar to D. exilis , but with wide central area and large distal boss, prominent sutural ridges extending between the rays.
Farinacci & Howe catalog pages: D. musicus * , D. sanmiguelensis *
Morphology: 6-rayed discoaster with bifurcate rays, similar to D. exilis in having complanate rays with triangular tips, but with wide central area and large distal boss with prominent sutural ridges extending between the rays.
Tags | LITHS: nannolith-radiate, star-shaped, CA: process, CROSS-POLARS: 1ou, V-prominent, |
Metrics | Lith size: 9->15µm; Segments: 6->6; Data source notes: size from ODs |
Geological Range:
Notes: Confined to NN5 in the Mediterranean (Theodoridis 1984) but ranges into NN6 in the East Pacific (Bukry 1981), distribution probably patchy
Last occurrence (top): within NN6 zone (11.90-13.53Ma, top in Serravallian stage). Data source: Young 1998
First occurrence (base): within NN5 zone (13.53-14.91Ma, base in Langhian stage). Data source: Young 1998
Plot of occurrence data:
Bukry, D. (1981b). Pacific coast coccolith stratigraphy between Point Conception and Cabo Orientes, Deep Sea Drilling Project Leg 63. Initial Reports of the Deep Sea Drilling Project. 63: 445-471. gs V O 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 V O de Kaenel, E., Bergen, J. A., Browning, E., Blair, S. A. & Boesiger, T. M. (2017). Uppermost Oligocene to Middle Miocene Discoaster and Catinaster taxonomy and stratigraphy in the circum North Atlantic Basin: Gulf of Mexico and ODP Leg 154. Journal of Nannoplankton Research. 37(2-3): 215-244. gs V O Stradner, H. (1959b). First report on the discoasters of the Tertiary of Austria and their stratigraphic use. Proceedings of the Fifth World Petroleum Congress. 1: 1081-1095. gs Stradner, H., Aubry, M. -P. & Bonnemaison, M. (2010). Calcareous nannofossil type specimens in the collection of the Geological Survey of Austria: A taxonomic and stratigraphic update. Jahrbuch der Geologischen Bundesanstalt. 150(1-2): 9-84. 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 O Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. gs V OReferences:
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Discoaster musicus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-1-2021
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