Brenhin Keller
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brenhinkeller.bsky.social
Brenhin Keller
@brenhinkeller.bsky.social
1.4K followers 810 following 130 posts
Assistant Prof. of Earth Sciences, Dartmouth College
Geochronology | Petrology | Earth History |
Computational Science | HPC | #julialang | he/they
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brenhinkeller.bsky.social
Brenhin Keller @brenhinkeller.bsky.social · Dec 22
New paper on glacial erosion rates and the Sadler effect that came out of a @dartmouthears.bsky.social grad seminar class just out now in Sci Adv! doi.org/10.1126/scia...
Limits to timescale dependence in erosion rates: Quantifying glacial and fluvial erosion across timescales
Globally, glacial erosion rates outpace fluvial, with limits to the biases introduced by measuring across different timescales.
doi.org
Reposted by Brenhin Keller
daxtens.bsky.social
Tragic: local man wants to solve technical problems at scale, realises that at scale they’re all ultimately social problems
January 11, 2026 at 11:51 AM
Reposted by Brenhin Keller
fossilsndcoffee.bsky.social
This #givingtuesday please consider donating to the Paleontological Research Institution/Museum of the Earth

PRI is a major US fossil collection and education center
& has been struggling after a major donor was unable to fulfill a pledge but is almost out of the woods, any support helps!
🦑⚒️🧪🐌🐚
Graphic that says I'm supporting PRI today because it's where my type specimen is with a picture of a Vermicularia (snail) apex. The PRI logo is in the bottom right and text reads www.priweb.org/donate
December 2, 2025 at 12:44 PM
Reposted by Brenhin Keller
dartmouthears.bsky.social
We are looking to hire a full-time tenure-track Assistant Professor in the general areas of stable isotope biogeochemistry and/or geobiology! For more information and to apply see apply.interfolio.com/176517 -- review begins November 15!
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apply.interfolio.com
October 28, 2025 at 8:59 PM
Reposted by Brenhin Keller
geologyjohnson.bsky.social
Pyritised, metamorphosed, and faulted #Archean microbial mats from South Africa. I love the colours on this one. #geology #paleontology
Photo of a rock with alternative wrinkly dark green and light green layers. There is a layer in the middle composed of brass colored polygonal pyrite crystals. A white scale bar shows that the rock is about 2 cm wide.
October 18, 2025 at 9:07 PM
Reposted by Brenhin Keller
permafrostee.bsky.social
Here’s a really nice alluvial fan I thought you should see
A really nice alluvial fan
September 4, 2025 at 6:14 PM
Reposted by Brenhin Keller
geophotographer.org
Check out these photos of the Tracy Arm Landslide to help get an idea of just how big it is.

📷 © Jacek Maselko and posted by AEC, taken at 3,500ft elevation on Tuesday, August 12th.

AEC page
earthquake.alaska.edu

AEC Facebook post
www.facebook.com/share/1Fzmxn...
🧪⚒️🌊
#alaska
#tsunami
#landslide
The image depicts a mountainous landscape with steep cliffs prominently visible in the foreground. The rock faces are textured with varying shades of gray, brown, and areas of green vegetation. A small body of water with a frothy surface lies at the base of the cliffs. In the background, a range of snow-capped mountains stretches across the horizon under a sky filled with thin, layered clouds. The overall scene has a rugged and expansive natural beauty. The image depicts a rugged mountain landscape featuring towering, snow-capped peaks under partly cloudy skies. The mountains are steep and rocky with patches of green vegetation on the lower slopes. A mixture of brown and gray rock is visible, contrasting with the white snow. At the base of the mountains lies a glacial area, showing large, sharp ice formations with a distinct blue tint. A small lake of muddy water is surrounded by chunks of ice. The foreground features green foothills. The overall setting is vast and remote, evoking a sense of untouched wilderness. The image depicts a mountainous landscape with steep, rocky peaks partially covered in snow. A glacier is visible in a valley between the mountains, flowing towards a body of water peppered with chunks of ice. The water is a mix of murky brown and icy blue, suggesting it is glacial runoff. The foreground is a contrast of vibrant green vegetation, displaying a dense forest at the bottom. The sky above is partly cloudy. The photo captures the natural beauty and ruggedness of the terrain. The image captures an aerial view of a vast glacial landscape. The foreground shows a rugged, uneven expanse of gray and white ice with visible crevasses, characteristic of a glacier. To the left, a wing of the aircraft is partially visible, indicating the perspective of the photo. Beyond the glacier, steep, rocky mountains rise dramatically, their surfaces marked with patches of green vegetation and some snow at the peaks. In the background, another glacier winds through a valley, bordered by more mountainous terrain. The sky is mostly clear, allowing sunlight to illuminate the scene.
August 14, 2025 at 9:35 PM
Reposted by Brenhin Keller
fossilsndcoffee.bsky.social
For Day50 of photoshopping @lastweektonight.com's John Oliver with fossils in the hopes that he saves the Paleontological Research Institution

Celebrating 90yrs of mollusk research at PRI! John is joined by a number of other H. sapiens who love science (and fun)-tag them all! 🧪🦑⚒️🐌 #fossils #savePRI
A case showing mollusk research at PRI including the logo, Ecphora, Turritellids, oysters, clams, and turrids. Text explains that PRI is one of the most important fossil collections in the US, especially for mollusks with well over 1 million mollusk specimens and 7 million total specimens in collections.
June 17, 2025 at 1:46 AM
Reposted by Brenhin Keller
clarkeocrinus.bsky.social
I sometimes take advantage of the analytical equipment at my real job. This is a Cambrian arthropod (probably not a Beckwithia) from the Wheeler shale of Utah. I used the XRF (X-ray fluorescence) to highlight iron and phosphorus. This is a 500 Ma digestive system.

#FossilFriday
April 18, 2025 at 9:56 PM
Reposted by Brenhin Keller
ljelkins.bsky.social
I am pleased to announce that my department (EAS at Nebraska) is hiring a teaching postdoc for AY 2025-2026 in the area of Earth Materials! I'm not on the committee but am spreading the word to my mineralogy/petrology networks on behalf of the committee. See ad for more details.
Postdoctoral Teaching Associate
The Department of Earth and Atmospheric Sciences (https://eas.unl.edu) at the University of Nebraska-Lincoln (UNL) has an opening for a Postdoctoral Teaching Associate in Earth Sciences. We are seekin...
employment.unl.edu
April 16, 2025 at 10:41 PM
Reposted by Brenhin Keller
jeffgreene.bsky.social
Unsurprisingly, @tressiemcphd.bsky.social is spot-on in this analysis: “A.I.’s most revolutionary potential is helping experts apply their expertise better and faster. But for that to work, there has to be experts.”
www.nytimes.com/2025/03/29/o...
Opinion | Actually, A.I. Is Pretty Mid (Gift Article)
A.I. is just what we need in the post-fact era: less research and more predicting what we want to hear.
www.nytimes.com
March 29, 2025 at 11:30 AM
Reposted by Brenhin Keller
ahamill.bsky.social
1/ An ongoing thread on the devastating M7.7 Mandalay (Myanmar) earthquake, 28 March 2025.

This GIS map is from USGS Pager.

#geographyteacher
March 29, 2025 at 8:07 AM
Reposted by Brenhin Keller
planetdr.bsky.social
We are assuming this was a planetary scientist traveling to the Lunar and Planetary Science Conference
paulecohen.bsky.social Paul Cohen @paulecohen.bsky.social · Mar 19
Le Monde reporting that a French scientist traveling to Houston to attend a conference was denied entry to US after a search of his phone & computer revealed messages critical of Trump's science cuts, "which [says CPB] conveyed hatred of Trump & could be qualified as terrorism". Computer confiscated
March 19, 2025 at 9:12 PM
Reposted by Brenhin Keller
goco.bsky.social
Who’s guilty of the discrepancy between minerals and whole-rock chemistry in plutons? Melt extraction might be innocent—mineral reequilibration is likely the real culprit! Fresh out on Pi Day by me, Brenhin @brenhinkeller.bsky.social, & Changqian! doi.org/10.1029/2024...
Amphibole Compositions Record Cold Post‐Emplacement Reequilibration in Plutons
Melts predicted from mineral compositions in arc plutonic rocks do not match bulk compositions, a discrepancy absent in volcanic rocks Neither bulk crystallization nor melt extraction can fully e...
doi.org
March 14, 2025 at 8:03 PM
Reposted by Brenhin Keller
byscottdance.com
New: A NOAA lab in Hawaii that is connected to the longest-running observation of global greenhouse gas concentrations is slated for closure in August, according to a list of lease terminations Democratic members of Congress shared with @washingtonpost.com.
Trump moves to close government lab that tracks planet-warming pollution
The lab is connected to the Mauna Loa Observatory, where scientists gather data to produce the Keeling Curve, a chart on the daily status of atmospheric carbon dioxide concentrations.
www.washingtonpost.com
March 14, 2025 at 6:23 PM
Reposted by Brenhin Keller
fontb.bsky.social
Playing a bit with our WaterLily.jl #CFD #JuliaLang solver and homogeneous isotropic decaying turbulence 🌀 128^3 grid running on my local #GPU ⚡ visualizing in real-time with @makie.org
github.com/WaterLily-jl...
March 12, 2025 at 10:47 PM
Reposted by Brenhin Keller
tidierjl.bsky.social
Coming soon to TidierFiles.jl for #JuliaLang: reading Google sheets as DataFrames.
February 9, 2025 at 4:53 AM
Reposted by Brenhin Keller
carlzimmer.com
National Science Foundation suspends salary payments, leaving researchers unable to pay their bills www.statnews.com/2025/01/30/t...
Story by @ericboodman.bsky.social
National Science Foundation suspends salary payments, leaving researchers unable to pay their bills
An NSF online payment system remained down after the federal funding freeze was lifted, leaving early-career scientists scrambling to pay bills
www.statnews.com
January 30, 2025 at 10:53 PM
Reposted by Brenhin Keller
adrianhill.de
You think Jacobian and Hessian matrices are prohibitively expensive to compute on your problem? Our latest preprint with @gdalle.bsky.social might change your mind!
arxiv.org/abs/2501.17737
🧵1/8
Figure comparing automatic differentiation (AD) and automatic sparse differentiation (ASD). (a) Given a function f, AD backends return a function computing vector-Jacobian products (VJPs). (b) Standard AD computes Jacobians row-by-row by evaluating VJPs with all standard basis vectors. (c) ASD reduces the number of VJP evaluations by first detecting a sparsity pattern of non-zero values, coloring orthogonal rows in the pattern and simultaneously evaluating VJPs of orthogonal rows. The concepts shown in this figure directly translate to forward-mode, which computes Jacobians column-by-column instead of row-by-row.
January 30, 2025 at 2:32 PM
Reposted by Brenhin Keller
jaywen.bsky.social
Nominations for the M. Lee Allison Award for excellence in Geoinformatics are open. This award is granted annually by GSA Geoinformatics and Data Science Division. Review of nominations will begin on March 1st, 2025. Please spread the word! Here is the nomination form: forms.office.com/r/CEBjb4kWZk
January 23, 2025 at 1:38 AM
Reposted by Brenhin Keller
kennarubin.bsky.social
Fresh & dense picrite, fresh aphyric 'a'a, basalts with infilled vesicles, and basalts with sharp flow contacts. just a few of the #hawaiian lavas cored well below modern sea level on #IODP #exp389 are showing a surprising range of #volcanic textures... all in the first site we've examined thus far.
February 14, 2024 at 4:50 PM
brenhinkeller.bsky.social
For any earth science grad students looking for a postdoc next year! ⚒️🧪
dartmouthears.bsky.social Department of Earth Sciences at Dartmouth @dartmouthears.bsky.social · Jan 24
The Department of Earth Sciences at Dartmouth College invites applications for the Joseph P. Obering Postdoctoral Fellowship. For more information and to apply, see apply.interfolio.com/159479. Review of applications begins February 1!
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January 24, 2025 at 8:26 PM
Reposted by Brenhin Keller
weareagc.bsky.social
Here we are, AGC is open for submission!
Find us here: agcj.org

#DiamondOpenAccess
#AGC
January 20, 2025 at 9:04 AM
Reposted by Brenhin Keller
kevinbonham.com
Very excited to announce that the Bonham Lab will be starting next month at Tufts (TMC GI division)!

I'll be recruiting at multiple levels - if you are interested in the intersection between computing and medicine, esp multi-'omics, microbio and immuno, reach out! #academicsky 🧪🧫🦠
Department of Medicine | Tufts Medicine
Access comprehensive care at Tufts Medical Center's Department of Medicine. Our experts provide personalized treatment for a range of conditions.
www.tuftsmedicine.org
January 17, 2025 at 5:51 PM
Reposted by Brenhin Keller
judithgeology.bsky.social
ithacavoice.org/2025/01/muse...

🧪⚒️ I'm dismayed to see the news that the Museum of the Earth may have to close its doors! If you or your organization can help support the museum, please reach out to them.

Or maybe just buy these amazing trilobite slippers from their gift shop:
Trilobite Slippers (Greenops)
Greenops boothiDevonian trilobite Trilobites crawled along the bottom of shallow seas for around 300 million years, from the beginning of the Cambrian Period to the end of the Permian Period. The name...
pri-gift-shop.myshopify.com
January 14, 2025 at 6:34 PM
Reposted by Brenhin Keller
juliahub.bsky.social
Discover new ways to compile Julia! Smaller binaries, AOT compilation with 'juliac,' and trimming tools for efficient deployment. juliahub.com/blog/new-way... #JuliaLang #JuliaCon #SoftwareDevelopment #Optimization
New Ways to Compile Julia
Discover new ways to compile Julia for smaller binaries and efficient code deployment with advancements in trimming and AOT compilation.
juliahub.com
January 7, 2025 at 8:10 PM