[coccoliths] [EXTERNAL] Re: Danian Ellipsolithus
Young, Jeremy
jeremy.young at ucl.ac.uk
Tue Mar 11 13:21:56 -03 2025
Vladimir
I noticed that there is also extensive discussion of the FAD of E. macellus in Steurbaut & Sztrákos 2008
Steurbaut, E. & Sztrákos, K. (2008). Danian/Selandian boundary criteria and North Sea Basin–Tethys correlations based on calcareous nannofossil and foraminiferal trends in SW France. Marine Micropaleontology. 67: 1-29
I can send you a pdf if you can't get that easily.
Jeremy
> On 11 Mar 2025, at 13:51, Мусатов Владимир <dr.musatov at yandex.ru> wrote:
>
> Hi Jeremi.
>
> Yes, I also noticed these photos, but I did not include them in my letter. It is very good that this species has been added to Nannotax. This removes many questions that arise in connection with the not very clear level of the first appearance of E. macellus - it is either absent, or so rare that its findings are only accidental. I have encountered the species E. macellus only once or twice in the early Paleocene (Danian stage).
>
> I will try to write a short article on this topic in JNR.
>
> Thank you!!!
>
> Vladimir
>
> ----------------
> Кому: Coccoliths at fcnym.unlp.edu.ar (coccoliths at fcnym.unlp.edu.ar);
> Тема: [coccoliths] [EXTERNAL] Re: Danian Ellipsolithus;
> 11.03.2025, 15:53, "Young, Jeremy" <jeremy.young at ucl.ac.uk>:
> I see that Okada & Thierstein 1979 also recognised this form - as "Early form of Late Danian age". they have a nice comparison of it with typical E. macellus on their plate 3
>
> I am adding E. gomidei to the main database of Nannotax - but a note in JNR on this, and including your images, would be valuable.
>
> Jeremy
>
> <Screenshot 2025-03-11 at 12.27.16.png>
>
> "Ellipsolithus macellus (Bramlette and Sullivan)
> Sullivan.
> 9. Early form of late Danian age. Sample 10-6
> 59-60 cm: 9a, cross-polarized light; 9b,
> phase contrast.
> 10. Later form of late Paleocene age. Sample
> 6-3, 39-40 cm: 10a, cross-polarized light;
> 10b, phase contrast"
>
>
>
> On 10 Mar 2025, at 14:32, Мусатов Владимир <dr.musatov at yandex.ru <mailto:dr.musatov at yandex.ru>> wrote:
>
> Hi all,
> Jean Hello.
> Thanks for the information!
> I made a selection of specimens of Ellipsolithus macellus, E. distichus and an unrecognized species - Ellipsolithus gomidei Costa & Antunes from the Kheu section (Northern Caucasus) and the Ozinki section (Northern part of the Caspian Depression). These species are all different and differ quite significantly both in size and in their appearance. It is somewhat similar to E. distichus, but it does not have such a pronounced perforation of the central area. I think that there is a need to recognize this species as valid with a distribution at the beginning of the NP4 zone.
> Look at the photos (attached file).
> This species is very similar to E. macellus in photo 38 Plate 3 of the article by Paul Bown, Hojung Kim, Samantha Gibbs Danian calcareous nannofossil evolution and taxonomy with focus on sites from the North Atlantic Ocean (IODP Expedition 342, Sites U1403 and U1407). J. Nannoplankton Res., 41(2), 2023, pp. 110–157
>
> <изображение.png> I think it's E. gomidei.
>
> What do you think?
>
> I would be glad if any of colleagues would join this discussion!
>
> Vladimir
>
>
> ----------------
> Кому: Mailing list for INA members and other scientists working with living or fossil nannoplankton (coccoliths at fcnym.unlp.edu.ar <mailto:coccoliths at fcnym.unlp.edu.ar>);
> Тема: [coccoliths] [EXTERNAL] Re: Danian calcareous nannofossil;
> 10.03.2025, 13:34, "Self-Trail, Jean M" <jstrail at usgs.gov <mailto:jstrail at usgs.gov>>:
> Vladimer,
>
> E. macellus does have its first occurrence in NP4 but it tends to be very sporadic. Additionally, the specimens I see are always much smaller than the E. macellus I see in the late Paleocene and early Eocene. Otherwise, they pretty much look the same!
>
> Cheers,
> Jean
>
>
>
> Jean M. Self-Trail, Ph.D.
> U.S. Geological Survey
> 926A National Center
> 12201 Sunrise Valley Dr.
> Reston, VA 20192
> 703-648-6013
>
> "Those who stand for nothing will fall for anything"
> —Alexander Hamilton
>
> From: Coccoliths <coccoliths-bounces at fcnym.unlp.edu.ar <mailto:coccoliths-bounces at fcnym.unlp.edu.ar>> on behalf of Young, Jeremy <jeremy.young at ucl.ac.uk <mailto:jeremy.young at ucl.ac.uk>>
> Sent: Friday, March 7, 2025 9:46 AM
> To: Coccoliths at fcnym.unlp.edu.ar <mailto:Coccoliths at fcnym.unlp.edu.ar> <coccoliths at fcnym.unlp.edu.ar <mailto:coccoliths at fcnym.unlp.edu.ar>>
> Subject: [EXTERNAL] Re: [coccoliths] Danian calcareous nannofossil
>
>
> This email has been received from outside of DOI - Use caution before clicking on links, opening attachments, or responding.
>
>
> Hi again Vladimir
> I can't really help with that - haven't looked at enough Danian Ellipsolithus to say, and for me it looks like a fairly typical E. macellus. However, other people may be able to say something more useful
> Jeremy
>
> On 7 Mar 2025, at 13:15, Мусатов Владимир <dr.musatov at yandex.ru <mailto:dr.musatov at yandex.ru>> wrote:
>
> ⚠ Caution: External sender
>
> Hi Jeremy,
> Thank you, I've already downloaded it)))
>
> I have a question - is it always the case that the base of the NP4 zone contains uncharacteristic small Ellipsolithus macellus? My photo shows an Ellipsolithus macellus similar in appearance to the E. macellus in Plate 3 foto 36 of the Bown et al. paper I requested. These specimens do not look like the typical large E. macellus that occur in NP9 and NP11. Can these small forms be identified as E. macellus, or is it a different species?
> How do you think?
>
>
>
> Musatov Vladimir
>
>
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