M. Hasson/M. Lapôtre ;)
13.02.2026 16:50
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M. Hasson/M. Lapôtre ;)
Finally, PhD student Claire Blaske used #pattern statistics in #subaqueous dunes formed by a #glacial #flood in the Channeled Scablands of WA and #megafloods on #Mars to estimate flood durations. A powerful new tool to understand #Hesperian / #Amazonian #hydrology on Mars (12/17 pm, EP34A-02)
Former postdoc @calvarez03.bsky.social discussed low-pressure wind-tunnel experiments at #NASA Ames showing that Mars’ large #ripples are aeolian drag ripples. Big implications for #paleoenvironments and sand #flux estimates on Mars (12/17 pm, EP33A-08). Published in @natcomms.nature.com this year
@mcolinmarvin.bsky.social next explored if—and why—aeolian #dune fields, like rivers, reach a near-transport threshold state. This work has neat implications for reconstructions of wind conditions on the early #Earth and on other #planetary surfaces (12/17 am, EP31D-1678)
Next was PhD student Michael Hasson, giving an invited talk about how #vegetation has changed the way #rivers move through space, with implications for interpretations of river deposits through the first 90% of #Earth history (12/16 pm, EP24C-04). Published in @science.org this year.
Busy week for @stanforddoerr.bsky.social EPSP at #AGU25! Started with PhD student Vittorio Colicci looking for clues about #Archean environments through the deposits of some of Earth’s oldest #coastal #dune fields in South Africa (12/16 am, EP21E-1659)
Did you know sand grains record their transport history?
New research in Geology shows zircon grains reveal their journey through microscopic abrasion “microtextures”—even in billion-year-old rocks!
Read more: geosociety.co/4oHG2J6
#Geology #GSAPubs
Link to the paper in #Geology: doi.org/10.1130/G537...
Co-authored by lab members Michael Hasson, Vittorio Colicci, and Raisha Abubo
@geosociety.bsky.social
Just out: PhD candidate @mcolinmarvin.bsky.social shows that like in quartz, #zircon grains preserve microscopic archives of their transport history. But unlike in quartz, those archives remain decipherable for billions of years, unlocking first 90% of #Earth ’s history
@stanforddoerr.bsky.social
Did you know that sand records its transport history as it moves across Earth's surface? We developed a new tool to investigate billion-year-old rocks by looking at microscopic features on zircon sand grains. Check out our new paper in @geosociety.bsky.social to see how!
doi.org/10.1130/G537...
View from the back of a large room with a person presenting slides at the front
Two people smiling holding lunar meteorites
A person presents their research during a poster session
A speaker at a podium presents slides
Over 100 planetary scientists from around the Bay Area recently gathered at Stanford to connect and discuss their research. Highlights:
📸 Laura Schaefer and Michelle Hill
“I’m doing something that’s merging geology and geochemistry with spacecraft. This is something I’ve been interested in since I was a kid. A lot of people in my field are obsessed with aliens, but I always was obsessed with rocks and planetary bodies.”
Meet Eva L. Scheller, new assistant professor:
Jusqu’ici, les géologues pensaient que les plantes avaient fait naître les rivières en méandres - ces grands cours d'eau en forme de S. Une nouvelle étude montre qu’elles existaient déjà avant : la végétation a seulement modifié leur façon de bouger 🌱
Explications avec du GIF végétal ⬇️
Findings from a recent study could upend the conventional view of how rivers have shaped continents over time.
It’s “a significant revision to our understanding of the history of the Earth,” said lead author Michael Hasson.
@marslogander.bsky.social
So proud of Michael!! 😎
This work was a collaboration with @alvitello.bsky.social at @unipd.bsky.social and A. Ielpi and @ubcokanagan.bsky.social
Check also:
- Perspective by J. Pizzuto: doi.org/10.1126/scie...
- Stanford’s press release: sustainability.stanford.edu/news/rise-pl...
Plants change how river bends move - paper by PhD student Michael Hasson out as First Release in #Science!!
Paper: doi.org/10.1126/scie...
Before #plants, #meanders did not grow laterally as much but translated downstream, making them look like braided rivers in rocks.
@stanforddoerr.bsky.social
Our results suggest that on Mars, values of the aerodynamic roughness length may reach up to 1 cm—up to two orders of magnitude larger than typically assumed. #NASA Ames, @stanforddoerr.bsky.social, @marslogander.bsky.social
Excited to share our latest publication in @natcomms.nature.com, where we analyze the aerodynamic roughness length over equilibrated rippled sand beds with active saltation under atmospheric pressures intermediate between those of Earth and Mars.
www.nature.com/articles/s41...
Best wishes to you and your family, Laurie!
Postdoc Carlos Alvarez shows that Mars’s large #aeolian #ripples are not impact ripples through low-pressure #wind tunnel experiments at #NASA Ames. Very excited about this one!
@stanforddoerr.bsky.social
www.nature.com/articles/s41...
New paper by PhD student @mcolinmarvin.bsky.social uses #patterns formed by #dunes to better understand sources, pathways, and sinks of #sand on #Titan. Spoiler: #Xanadu has outsized influence on #eolian sediments, and sand travels far!!
@stanforddoerr.bsky.social
I'm giving a talk at Stanford tomorrow! If you're around, come join us. I think Zoom is an option too—details here:
events.stanford.edu/event/earth-...
Congrats @jtuttlekeane.bsky.social !!!!!
Final stop with postdoc Carlos Alvarez on the "Aerodynamic #roughness of rippled beds under active #saltation at low atmospheric #pressure" (EP54A-03, 146 B).
Fr 4:20-4:30 pm.
#Wind tunnel work reveals impact of #bedforms and #saltation on #Mars.
#AGU24
(10/10)
Back to #Mars with PhD student Claire Blaske asking "Were #boulder fields along Mars' putative #ocean paleoshoreline deposited by a #tsunami?" (EP51B-06, 146
B).
Fr 9:25-9:35 am.
Or perhaps #floods? #glaciers? #impacts?
#AGU24
(9/10)
Collaborator @alvitello.bsky.social from U. Padua next will show that " #Vegetation leaves measurable imprints on the #morphodynamics or #meandering #rivers"
(EP51F-1434).
Fr 8:30 am-12:20 pm.
All about how #plants affect #meander shape!
#AGU24
(8/10)
PhD student Timmy Lui will take us to #Mars for his " #Segmentation of #dune crestlines using #convolutional #neural #networks"
(EP51D-1378, hall B-C).
Fr 8:30 am-12:20 pm.
A challenging task with potential to reveal much about #Mars #climate!
#AGU24
(7/10)
Kicking off Fr, PhD student Vittorio Colicci will present his MS work at MIT, "Examining the influence of early #tree #root geometry on #soil cohesion and anchoring strength using 3D-printed reconstructions" (EP51F-1439, hall B-C)
Fr 8:30 am-12:20 pm
#AGU24
(6/10)
Alternatively, undergrad Brian Amaro will talk about his "Automatic characterization of the size distribution of small #rocks on the #Moon and implications for orbiter-based extrapolations" (P44C-06, Liberty M at Marriott).
Th 4:52-5:02 pm.
#AGU24
(5/10)
Then former postdoc @agunn.bsky.social (now faculty at Monash) and recipient of #AGU24 's Luna Leopold award will deliver the Sharp lecture (Ballroom B). #Dunes galore on the horizon!
Th 4-5:30 pm.
(4/10)