INA16 Athens - September 2017

Calcidiscus macintyrei

Short diagnosis: Large (>10µm) Pliocene circular species of Calcidiscus with central opening.

Taxonomy:

Farinacci & Howe catalog pages: Cyclococcolithus macintyrei *

Short diagnosis: Large (>10µm) Pliocene circular species of Calcidiscus with central opening.

Geological Range:
Notes: Use of the name C. macintyrei is normally confined to the large specimens occurring in the Plioceneand early Pleistocene although similar morphotypes do occur in the Miocene. The last occurrence of the species has been used as a sub-zonal marker (Raffi et al. 2006). However, it is often rare near its top which can make placement of the event dificult.
Last occurrence (top): in mid part of MIS-58 Isotope stage (50% up, 1.7Ma, in Calabrian stage). Data source: Raffi et al. 2006
First occurrence (base): within NN6 zone (11.90-13.53Ma, base in Serravallian 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. Interpret with caution & read these notes
• Taxon plotted: Calcidiscus macintyrei, synonyms included - Calcidiscus macintyrei; Calcidiscus macintyrei (>11 um); Calcidiscus macintyrei (grainy); Cyclococcolithina macintyrei; Cyclococcolithus macintyrei; Calcidiscus tropicus (<10 µm); Parent: C. leptoporus group

Calcidiscus macintyrei compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-8-2017 Taxon Search: Advanced Search AphiaID: not found Go to Archive.is to create a permanent copy of this page - citation notes

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Kevin Jackson (US)

This page references Raffi et al., (2006), yet the top occurrence (~0.44Ma) doesn't appear to reflect the updated top occurrence of ~1.64Ma. Regarding the base occurrence Raffi (2006) states "LO of Calcidiscus macintyrei (alternative marker for CN3–CN4 boundary): highly contradictory stratigraphic positions are reported for this biohorizon in the literature and partly related to the ambiguous taxonomic status of this species (see Raffi et al., 1995)." It seems like the geological range is ambiguous. I don't have access to some of the other papers, so I was curious how reliable the geological range is for this nanno. Is is the range isochronous?

20th July 2015 3:13am

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