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Jean-François Cudennec

@jfcudennec.bsky.social

2.6K followers 610 following 980 posts

PhD. Old mollusks lover : Sclerochronology and isotopes in archaeological or paleontological context. #PaleoSky curator and limpet nerd. Also nature photographer: https://bsky.app/profile/jfcphotos.bsky.social

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Jean-François Cudennec @jfcudennec.bsky.social · Oct 26

Fresh off the press and in open access !

Our latest paper investigates the seasonality of Atlantic shell middens, from the Neolithic to the Middle Ages. Not familiar with sclerochronology, and why it's cool ? A short thread !

#AcademicSky #PaleoSky 🧪

www.sciencedirect.com/science/arti...

Limpet shell oxygen isotopes as markers of seasonality in shell middens: The case of Molène Archipelago (Brittany, France) from Late Neolithic to Early Middle Age

The stable oxygen isotopes ratio (δ18O) from marine mollusk carbonated shells is widely used as a palaeo-thermometer, as the main driver of this ratio…

www.sciencedirect.com

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Jean-François Cudennec @jfcudennec.bsky.social · 13h

Red Dead Redemption and La Recherche du Temps Perdu take place at the same time.

rax ‘levon honkers’ king @raxkingisdead.bsky.social · 1d

you ever think about those real weird overlaps. like tennessee williams might have listened to the ramones

Jean-François Cudennec @jfcudennec.bsky.social · 13h

#UnrelatedPicsWednesday !

Left : 28 late Cretaceaous dinosaur eggs from China, deposited 85 million years ago

Right : 27 Mesolithic skulls from the "Skull nest" of the Ofnet Cave in Germany

Egg clutch sampled for chronological studies. Credit: Dr. Bi Zhao

Part of great skull burial at Ofnet, Bavaria. Copied from Hugo Obermaier, Fossil man in Spain, Newhaven, 1924, figure 143, page 338. (After F.R. Schmidt). Mesolithic level. General Collections Keywords: disposal of the dead; pre-historic; Archaeology; funerary techniques

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Jean-François Cudennec @jfcudennec.bsky.social · 1d

Sa fé réfléchire...

Jean-François Cudennec @jfcudennec.bsky.social · 1d

[🚨 Breaking News ]
Baffled scientists discover 12,000-year-old human-shaped plastic trash at the Karahantepe archaeological site in southeastern Türkiye 🏺

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Reposted by Jean-François Cudennec

Paul D. Taylor @nhmbryozoa.bsky.social · 2d

#MolluscMonday Early Pleistocene Neptunea angulata from the Red Crag of East Anglia bearing a striking example of the shell repair trace fossil Caedichnus, normally representing failed attempts at predation by crabs. Would handling this sinistral snail have proved difficult for the crab?

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Jean-François Cudennec @jfcudennec.bsky.social · 3d

Source :

www.reddit.com/r/dataisbeau...

From the dataisbeautiful community on Reddit: AI boom makes Caribbean island rich: Anguilla now generates 47% of its income from .ai domains, up from <1% prior to the boom [OC]

Explore this post and more from the dataisbeautiful community

www.reddit.com

Jean-François Cudennec @jfcudennec.bsky.social · 3d

🇦🇮 Anguilla Island now gets 47% of it’s state revenue from selling .ai domains

Graph showing the increase of the number of .ai domains and revenue since 2019, with a boom since late 2022 (chat GPT launch)

Google map image showing the localisation of Anguilla in the Caribbean

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Jean-François Cudennec @jfcudennec.bsky.social · 3d

Preparing for the new week like a 5th Place 2025 Small World in Motion Competition (newborn sea urchin walking along the seabed)

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Jean-François Cudennec @jfcudennec.bsky.social · 5d

Probably yes. Large, fast-growing mollusks records their environments with incredible precision and reliability.

www.sciencedirect.com/science/arti...

20,000 days in the life of a giant clam reveal late Miocene tropical climate variability

Giant clams (Tridacna) are well-suited archives for studying past climates at (sub-)seasonal timescales, even in ‘deep-time’ due to their high preserv…

www.sciencedirect.com

Jean-François Cudennec @jfcudennec.bsky.social · 5d

This paper for example finds a 30cm/year growth rate :

(note that it's on different species, from Colorado and not Greenland, but still giants from the same genus)

www.researchgate.net/publication/...

Paleoecology of giant Inoceramidae (Platyceramus) on a Santonian (Cretaceous) seafloor in Colorado | Journal of Paleontology | Cambridge Core

Paleoecology of giant Inoceramidae (Platyceramus) on a Santonian (Cretaceous) seafloor in Colorado - Volume 81 Issue 1

www.cambridge.org

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Jean-François Cudennec @jfcudennec.bsky.social · 5d

From what I've read about these animals, they developped extreme flatness to enhance their gill/body mass ratio to survive in oxygen-depleted environments. They had to grow quite fast to achieve that, so I would think that these are not annual growth line.

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Jean-François Cudennec @jfcudennec.bsky.social · 5d

For #FossilFriday, meet Inoceramus : the largest bivalve to ever exist. This genus lived in the Cretaceous seas of North America and Europe.

This one is 178 cm long. And look at these rings ! It must an amazing palaeoenvironmental recorder to work with 😍

#PaleoSky 🦑 🧪 ⚒️

A shell of a bivalve mollusc that was found in 1952 in the valley Qilakitsoq on the Nuussuaq peninsula in western Greenland.

The scientific name of these bivalves is Inoceramus steenstrupi. They lived between 83 and 63 million years ago. These are the largest bivalves ever to exist. It is thought that they lived in an oxygen-poor environment and that they layed unattached on the sea floor filtering plankton and detritus from the water.

The shell is 178 cm (70 inch) long. The other half of the bivalve is in the Geological Museum of Copenhagen. ___

On display at the Greenland Institute of Natural Resources. Link to this new Institute filled with many hallway displays at www.natur.gl/ hey now, "moi" for scale and a line-up of 2014 Nuuk Geoscience Workshop geologists waiting for their turn with the mighty mollusk.

The Nuuk display is geotagged instead of the Cretaceous fossil-bearing rock formation on the opposite side of Greenland.

Photo by H. Steenkamp with permission for my photo-shop'd posting.

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Jean-François Cudennec @jfcudennec.bsky.social · 5d

Today's find on r/MapPorn : the Viking expansion in Europe, 790 - 1066 AD

Credit : u/PisseGuri82

Map eu Europe, highlighting the different area occupied or raided by Vikings.

The map is full of details : Norse kingdoms, dates of arrival, main settlements, area under direct control, influence, or raided by norse, etc.

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Jean-François Cudennec @jfcudennec.bsky.social · 7d

Amazing work !

Reposted by Jean-François Cudennec

Nick Bezio @beziostudio.bsky.social · 8d

Day 30 - Dream. The final day of #sciartseptember. My long-term dream has always been to create a series of illustrated guides that would help identify the various jellies and jellyfish of the would. Creating illustrations like the ones below to accurately ID species.

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Reposted by Jean-François Cudennec

Oxford Archaeology @oxfordarchaeology.bsky.social · 8d

Our Cambridge office are looking for Project Officers to join our Field Team

Interested? Check out the full job description and how to apply: tr.ee/PO-Cambridge

📅Applications close 12th October

Field Project Officers - Cambridge

tr.ee

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Jean-François Cudennec @jfcudennec.bsky.social · 8d

Source : Expédition Uruguay Sub200, @schmidtocean.bsky.social

Jean-François Cudennec @jfcudennec.bsky.social · 8d

His friends will never believe him 🦑

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Jean-François Cudennec @jfcudennec.bsky.social · 8d

Pas tout à fait inutile : il donne le droit d'écrire "docteur" ou même ", PhD" dans les pseudos en ligne. Un atout non négligeable.

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Jean-François Cudennec @jfcudennec.bsky.social · 9d

And influencers let these giant snails crawl on their faces, praising their mucus for skin benefits ??

Screenshot from IG showing a person with a giant African snail crawling on its face

Slimy face care : a snail crawling on a person’s face

Jean-François Cudennec @jfcudennec.bsky.social · 9d

🐌 For this week’s #MolluskMonday, a new rabbit hole I just discovered : there’s a whole « African giant snail-gram », where these big bois (Lissachatina fulica) are getting over-pampered with optimal humidity, calcium-rich diets, and cozy terrariums…

Screenshot from @sirenessence on IG, showing her giant African snail getting a special calcium care for it’s shell

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Jean-François Cudennec @jfcudennec.bsky.social · 9d

Cela ne l'aura pas plombé très longtemps, puisqu'il a retrouvé des sponsors (cancel culture toussa toussa)

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Jean-François Cudennec @jfcudennec.bsky.social · 9d

Il a même retrouvé des sponsors 💀

(Ce qui rend son utilisation de l’IA encore plus pathétique)

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Jean-François Cudennec @jfcudennec.bsky.social · 9d

And you, how’s science popularization in your country?

On French YouTube, Léo from Dirty Biology (1.17M subs) challenges Gordon Childe’s early 20th‑c. evolutionism and Rousseau’s “state of nature,” using AI‑generated visuals.

You can imagine my face when I saw his Florida “shell mounds”...

🧪 🏺

The youtuber stands in front of an AI-generated picture of a "Calusa shell mound".

Either the Calusa people were measuring 2/3 cm, or the shell they collected are 3m tall...

An AI-generated picture of a native american catching fish in a stone pond, with a "Calusa shell mound" in the background.

Once again, the "shell mound" is made of giant shells decorating a small hill...

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Jean-François Cudennec @jfcudennec.bsky.social · 9d

The sky is blue, but so are the caves... 💙

#PaleoSky 🏺 🧪

Dr Izzy Wisher @izzywisher.bsky.social · 9d

Time to update your Palaeolithic palettes... 🔵

Very proud to share our new research on the OLDEST use of blue pigment! We identified traces of azurite - a vibrant blue mineral - on a stone object around 14-13,000 years old. Why is this so exciting? 👇🏺

doi.org/10.15184/aqy...

Close-up image of a sand coloured stone, with a diagonal crack. The sand rock has a textured surface, and small spots of blue can be seen towards the centre of the stone. The background is grey.

Microscopic photo of the blue spots, that are irregular in shape and size and positioned diagonally across the image. The rest of the photo shows the rough sand coloured texture of the stone.

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