Valentin Zuchuat

Bioturbation Shapes Marine Biogeochemical Cycling Following the End‐Permian Mass Extinction in Northern Pangea During the end-Permian mass extinction, a global decline in seafloor sediment mixing and burrowing (bioturbation) provides critical evidence for the collapse of marine ecosystems, likely triggered by...

🎉New paper with Brian Beaty: After the end-Permian ME, burrowers didn’t just return, they rewired seafloor chemistry.
Shallow particle mixing revived C & S cycling (<200 kyr); full P recycling waited on deeper burrowers (>1 Myr). Congratulations Brian!
paper: onlinelibrary.wiley.com/doi/10.1111/...

When you see the dramatic impact that a 1° change in the dip of the strata has on fluid flow in porous media, we field geologists might need to rethink our "+-5° is totally fine" when measuring strata dip angle.

Thanks Thomas Poulet for the collaboration!
doi.org/10.1130/G538...

🚨 New Paper 🚨

MacDonald et al. investigate passive CO2 mineralisation in anthropogenic carbonate deposits through isotopic geochemical analysis of different samples collected across Scotland and Northern England.

Read the full publication here: oap.unige.ch/journals/sdk...

#AEGC2025 Perth
Tomorrow we’re tackling self-organisation & allogenic artifacts in sedimentary basins — how to tell real vs apparent cycles, and what that means for basin reconstruction. I have gifs and memes, hope it helps 😇

⏰ Tues. 11:20
📍 Sed & Strat session, riverside theatre.

So we can only hope of major volcanic eruptions to stay below+1.5 °C of global warming in the next five years? How do we react to that?

📣 Meet our new Associate Editors!

Emilia Le Pera - University of Calabria, Italy
Siliciclastic petrography & provenance analysis

@arnaudgallois.bsky.social - Kocaeli University, Turkey
Carbonate sedimentology & diagenesis, Microbial carbonates, Non-marine carbonates

📣 Meet our new Associate Editors!

Sanem Acikalin - Newcastle University, UK
Sandstone diagenesis, organic matter transport, paleoclimate, provenance.

Francisco Tognoli - Federal University of Rio de Janeiro, Brazil
Digital outcrop models, Machine learning models, Python for Geology, Data analysis

📣 Meet our new Associate Editors!

Nan Wu - Tongji University, China
Submarine landslides, Mass-transport complexes, Turbidity currents, Submarine canyons, Sedimentary process

Thomas Blaise - University Paris-Saclay, France
Mineralogy, Calcite U-Pb geochronology, 3D Geological modelling

📣 Meet our new Associate Editors!

Cecilia Lopez-Gamundi - JPL.
Carbonates, forward modelling, remote sensing, sediment transport, coastal processes.

Arnoud Slootman - Colorado School of Mines.
Bedforms, sediment transport, carbonate slopes, turbidites, carbonate sediment.

Coming to the ISC 2026 in New Zealand? We have two sessions for you:
1. Coastal to shelf environments across time and space
2. Open Science in Sedimentology: missteps, success stories, standards, and solutions
Detail here confer.co.nz/isc2026/sess.... Abstract submission deadline 16.05.2025.

People are gathering in front of the Texas Capitol in Austin to protest the Trump administration’s attack on science

One of the signs says “I ♥️ trans mice! (And trans people too!)

It was great to see today all the courageous and inspiring people (several awesome students among them) who are ready to fight for science, for democracy, for equality #standupforscience #Austin

...their text and fig2D say that these gravel-rich (!) inclined strata are formed by tides. Do they suggest a 30 m tidal range? And if they're gravel rich , these tides must have insanely strong! I guess modelling could work, but it would need a few PhDs to develop the equations to model Mars tides

As much as these images are amazing I am skeptical with their tidal interpetation. They cite O'Neil and Dunn 2003 as justification to the geometry they see. O&D showed structures 2-3 m below the surface, whereas Mars' structures go down 30 m below the surface...

@sedimentologika.bsky.social is looking for three new volunteer associate editors as well as a few more helpers for its production team! Go to sedimentologika.org for more info, come and help change our publishing landscape towards a true Free Open Access future!

Directory of Open Access Journals – DOAJ DOAJ is a unique and extensive index of diverse open access journals from around the world, driven by a growing community, committed to ensuring quality content is freely available online for everyone...

Not sure if there is a list out there formally for Earth Sciences, but here are some I know of: Volcanica, Seismica, Sedimentologika, Geodynamica, The Sedimentary Record, Tektonika, Geomorphica, Advances in Geochemistry and Cosmochemistry. You can also try searching the DOAJ website! doaj.org

We are advertising volunteering positions for three Associate Editors specialised in 1) Carbonate sedimentology & stratigraphy; 2) Slope to basin-floor processes; 3) Sediment outcrop imaging.
Check out the full position details on our website: oap.unige.ch/journals/sdk...

🚨 New Paper 🚨

Okwara et al. discuss the downstream grain-size evolution and spatial facies partitioning of the Middle Jurassic wave-influenced Brent Group deltaic succession through subsurface data analysis.

Read the full publication here: oap.unige.ch/journals/sdk...

🌟 Exciting Volunteer Opportunity! 🌟
Curious about joining our Production Team? Check out the full position details on our website: bit.ly/SedkVProdTeam
If you're interested, send your application to: contact@sedimentologika.org 
We’d love to hear from you! ✉️

I might live under a rock. But #NotebookLM is f***ing incredible! Here is a little podcast on our #DOA paper on the coastal dynamics of the Gulf of Carpentaria we wrote with @satellitesci.bsky.social, Miquel Poyatos, Björn Nyberg, Rachel Nanson, Stephen Sagar, Leo Lymburner!

tinyurl.com/3j9fb9sh

If you're like my office mate today and you need a break, check out our #preprint in Climate of the Past on the Phanerozoic climate record of #Svalbard. This manuscript is a beast that Aleks Smyrak-Sikora (NTNU, lead author) managed brilliantly! Well done! egusphere.copernicus.org/preprints/20...

Come and join our @sedimentologika.bsky.social team!🏜️🏞️🏝️

2/2 ..Now I've got them in my Dropbox, but I'm not super confident in sharing such a link on social media. I thought about Pangaea, but they don't take these kind of material. Cheers

1/2 Hei folks, I was wondering if anyone knew a nice platform to upload lectures-slide decks. I have all my RWTH-time courses (intro-mineral BSc, sedimentology BSc in German and English, and basin dynamics MSc in English), and they might as well be useful to some people..

Hei #GeoSky, quick wording-question: Would you rather write
1. The Lower Triassic climate was..
or
2. The Early Triassic climate was..?
Using the word stratum instead of climate, then I'd go option 1; with climate, I'm a little hesitating, though.

P.s. "During the Early Triassic" isn't an option

The SedK team extends its best wishes for the New Year 2025 to the entire Sedimentology community! 🎆
💎Thank you to all our contributors, readers and supporters!

Hmm, I've always thought these large bands were more related to larger volumes of fluids migrating through the rocks rather than the smaller-scale "stagnant" water-forming Liesegang bands. Awesome photos!

Resurrection of a diatom after 7000 years from anoxic Baltic Sea sediment academic.oup.com/ismej/advanc... #jcampubs

The people at ‪Sedimentologika‬ are working hard to make a sedimentology diamond open access (free to read, free to publish) journal a reality.
The least we could do is check it out. ⚒️

So proud of this cover! great work @romainvaucher.bsky.social and thank you Ryusuke Kimitsuki for this beautiful photo 📷
Read the related paper in this new issue !