Citation: Triquetrorhabdulus milowii Bukry, 1971Rank: SpeciesVariants: T. auritus Stradner and Allram, 1982 - more wedge-shaped, occasionally with ridges at blunt end.
Distinguishing features: Parent taxon (Triquetrorhabdulus): Elongate, tri-radiate nannoliths formed of a single calcite crystal with the c-axis parallel to the length of the nannolith. Nannolith straight with bilateral or trilateral symmetry. Shows high birefringence. This taxon: Short (8-15µm), broad (5-8µm) species of Triquetrorhabdulus with curved sides. All blades similar.
Geological Range: Last occurrence (top): within NN6 zone (11.90-13.53Ma, top in Serravallian stage). Data source: Young 1998 First occurrence (base): within NN1 zone (22.82-23.13Ma, base in Chattian stage). Data source: Young 1998
Plot of occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Bown, P. R. & Dunkley Jones, T. (2012). Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). Journal of Nannoplankton Research. 32(2): 3-51. gsVO
Bukry, D. (1971b). Cenozoic calcareous nannofossils from the Pacific Ocean. San Diego Society of Natural History Transactions. 16: 303-327. 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. gsVO
Perch-Nielsen, K. (1977a). Albian to Pleistocene calcareous nannofossils from the Western South Atlantic, DSDP Leg 39. Initial Reports of the Deep Sea Drilling Project. 39: 699-823. gsVO
Stradner, H. & Allram, F. (1982b). The nannofossil assemblages of Deep Sea Drilling Project Leg 66, Middle America trench. Initial Reports of the Deep Sea Drilling Project. 66: 589-639. gsVO
Theodoridis, S. (1984). Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. Utrecht Micropaleontological Bulletin. 32: 1-271. gsVO
Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. gsVO
Triquetrorhabdulus milowii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-9-2021