[coccoliths] [EXTERNAL] Re: Danian calcareous nannofossil

[Self-Trail, Jean M]

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"
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From: Coccoliths <coccoliths-bounces at fcnym.unlp.edu.ar> on behalf of Young, Jeremy <jeremy.young at ucl.ac.uk>
Sent: Friday, March 7, 2025 9:46 AM
To: Coccoliths at fcnym.unlp.edu.ar <coccoliths at fcnym.unlp.edu.ar>
Subject: [EXTERNAL] Re: [coccoliths] Danian calcareous nannofossil




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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> wrote:


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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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