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Reposted by Jesse ‘Πέτρος’ Walters

Dr. Petr Brož @chmee2.bsky.social · 13/08/2025

Hey folks! #Geology often gets overlooked in schools Which is crazy, because it explains why the world looks the way it does – from #mountain ranges to the ground beneath your feet So I want to fix that! How? By making a new educational tool for cool experiments in schools <3

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 12/08/2025

U-Pb garnet geochronology is a great technique for dating metamorphic and igneous rocks, but garnets have very low U and Pb. Sometimes we might be dating the inclusions instead. It is not always clear what is and is not an inclusion! See the paper here: lnkd.in/gGriU_Fv #geology #geochronology

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Reposted by Jesse ‘Πέτρος’ Walters

Clemens🇪🇺 @alpenwetter.bsky.social · 21/06/2025

The alps have warmed extremely - as can be seen here in the data from #Innsbruck. Warm years are dominant since the 90s, cold years disappear. Massive glacier melting is only one consequence. Weather Obs started very early here, Maria Theresa was still alive. #showyourstripes #climateaction

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Reposted by Jesse ‘Πέτρος’ Walters

Dr. Simon Jowitt @thejow.bsky.social · 20/06/2025

Nice to get to talk to the New York Times @nytimes.com about funding challenges around publicly available precompetitive geoscience data acquisitions and geological mapping right when these data are more vital than ever for national and economic security: www.nytimes.com/2025/06/20/c...

nytimes.com

There Might Not Be a Map for That: Budget Cuts Threaten Geological Surveys

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 24/02/2025

Thanks! There are a lot of different plotting options. I need to make some instructional videos.

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 22/02/2025

Announcing MinPlotX, an open-source software for mineral formula recalculation and compositional plotting with an easy-to-use stand-alone graphical user interface. The open-access paper is here: lnkd.in/eB4im8dh MinPlotX can be downloaded here: lnkd.in/eXMHtkkK #geology #petrology #minerals

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 27/01/2025

Very interesting! Maybe the result of mantle metasomatism? I guess I just wasn't lucky enough!

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 27/01/2025

Where in Norway? I looked for olivine in Almklovdalen, but I didn't find anything like that! This looks to me like the larger more gemmy crystals you get in metasomatized carbonate rocks instead of ultramafics.

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 20/01/2025

AGC is now open for submissions! I am excited to be a handling editor of this new community-lead diamond open access journal. I look forward to seeing your submissions! Check out the webpage for more information: journals.uu.se/AGC/index

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Reposted by Jesse ‘Πέτρος’ Walters

David Ho @davidho.bsky.social · 17/01/2025

The Earth is undergoing rapid unscheduled warming.

Line graph showing global surface temperature records from 1850 to 2024, compared across various datasets: NASA, Hadley/UEA, NOAA, Berkeley, and Copernicus ERA5. The y-axis indicates temperature deviations relative to the 1850-1900 average.

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 15/01/2025

Finally some #geology on The Late Show. If he can remember that cummingtonite is in the monoclinic crystal system so can you!

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 04/01/2025

Wasn't the implementation blocked by a federal judge?

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 03/01/2025

First lecture of 2025 prepared! How do minerals grow and rocks form? Seems like a very basic question in geology, given how much of the science is build on the prerequisite of rocks existing in nature, but the answer is complex. #petrology #metamorphism #kinetics #thermodynamics

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 04/12/2024

I agree. I am lucky that Bob let me work on such a cool story with him. He's published a lot on pressure solution in shear zones going back to the 80s. We are also working on some interesting aspects of activity gradients and disequilibrium mineral preservation in these rocks.

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 04/12/2024

In the above image you can see that the muscovite in the kink band contains lower Na and higher Mg compared to the, consistent with selective dissolution and reprecipitation within this high strain zone.

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 04/12/2024

New paper alert! Micas and chlorite show progressive recrystallization in a retrograde shear zone, demonstrating that pressure solution is the dominant deformation mechanism (followed by grain boundary sliding). Check it out here lnkd.in/gCqMxaJB #geology #metamorphic #rocks #minerals #science

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 28/11/2024

Why are grant proposals always due at the worst times? In the US they are right after New Years, for the ERC grants they are at the beginning of the teaching term. It's like they want to torture us.

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 19/11/2024

Thanks! The new influx of people was definitely an inspiration. For a while there it wasn't clear where or if people would migrate to another platform.

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Reposted by Jesse ‘Πέτρος’ Walters

Ed Hawkins @edhawkins.org · 17/11/2024

Mapping changes in temperature every year (1850-2023) Each year has a different pattern of temperature variations but the trends are clear and stark

174 tiny maps showing temperature variations

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 22/04/2024

U-Pb garnet geochronology reveals a 400 million year evolution of the lower crust, including multiple periods of ultrahigh temperature metamorphism! Check it out: link.springer.com/article/10.1... ⚒️⚛️🔬🧪

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Reposted by Jesse ‘Πέτρος’ Walters

Michael Anenburg @manenbu.bsky.social · 09/04/2024

Do you have silicates in or around your carbonatites? Maybe you have an antiskarn! New paper with @thegeojesse.bsky.social out in Contributions to Mineralogy and Petrology, open access at doi.org/10.1007/s004...

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 23/03/2024

I will start in July as an Assistant Professor of Petrochronology at the University of Graz, Austria. Looking forward to new research opportunities and the chance to grow as an educator. Keep an eye on this space as I will advertise a PhD position soon. ⚒️🧪🔬⚛️

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Reposted by Jesse ‘Πέτρος’ Walters

NPR @npr.org · 09/03/2024

The lower 48 states just had the warmest winter in 130 years of record-keeping, according to the National Oceanic and Atmospheric Administration. Temperatures were more than 5 degrees Fahrenheit hotter than average.

npr.org

U.S. has warmest winter on record – and no, that's not a good thing

From lack of snow to wildfires, a record-warm winter had impacts across the country. Scientists say winters are warming faster than any other season in the U.S.

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 06/03/2024

Interested in subduction zones and volatiles? Consider submitting to our session at EMC 2024 in Dublin. Abstracts are due on March 22nd: emc-2024.org/abstract-sub... ⚒️

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 22/02/2024

Thinking of attending EMC24 in Dublin? Consider submitting an abstract to our session in honor of Ed Grew! Abstracts submission (22 March deadline) & registration here: emc-2024.org/registration/ ⚒️🧪🌎

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Reposted by Jesse ‘Πέτρος’ Walters

Dr. Lucia Perez-Diaz @drlperezdiaz.bsky.social · 20/02/2024

We are LIVE on #Kickstarter. I repeat, we are LIVE! This is not a drill! Support QUARTETnary for as little as €1 and help us bring science to the table! 🦕🌱🌎https://www.kickstarter.com/projects/irisvanzelst/quartetnary/

kickstarter.com

QUARTETnary - The card game about the geological time scale

Discover the history of the Earth by collecting mountains, animals, and plants to complete your time scale!

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Reposted by Jesse ‘Πέτρος’ Walters

Katharine Hayhoe @katharinehayhoe.com · 21/02/2024

In western Canada, the wildfire “season” has become the whole year, as over a hundred fires from 2023 continue to smolder, many of them underground. www.cbc.ca/news/canada/...

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 06/02/2024

These are spines from a certain type of sea urchin. Must be fairly large!

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Reposted by Jesse ‘Πέτρος’ Walters

Samuele Papeschi サムエレパペスキ | Geology is the way ⚒️🧪 @calamitaman.bsky.social · 30/01/2024

A tiny wee chloritoid star from the highest-grade rocks in the Northern Apennines (but still low grade), the Massa Unit: home of the very rare chloritoid + kyanite assemblage. ⚒️

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 24/01/2024

I wish I studied Lherzolites just so I could go look at the pretty rocks

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 15/01/2024

Yes, I posted in haste and made a mistake with the appropriation. USGS data, but a map made by someone unaffiliated.

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 15/01/2024

It was pointed out to me that I misread the description, the map uses USGS data but was created by someone else. This map shows the locations of the waterfalls from the same database: thewhyaxis.substack.com/p/map-every-...

thewhyaxis.substack.com

Map: Every waterfall in the lower 48

By all means, chase them

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 15/01/2024

I grew up in the Gorge and my casual observation is that there does appear to be more waterfalls on the Oregon side for whatever reason. Probably one of the best places in the world to see waterfalls.

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 15/01/2024

I agree that there are certainly some high-density places in Oregon, but I think the overall higher rainfall and greater expanse of mountainous regions in Washington tip the scale.

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 15/01/2024

I miss them too. It felt like every hike I ever took growing up involved at least one, if not more, waterfalls.

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 15/01/2024

Fantastic USGS map of all of the natural waterfalls in the USA. How many does your state have? Proud to be from Washington state, which tops the chart with a total of 2907 waterfalls! ⚒️

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Reposted by Jesse ‘Πέτρος’ Walters

Henning @geohenning.bsky.social · 15/01/2024

Iceland's daily paper 'Morgunblaðið' has this incredible front page photo today. 🌋⚒️ #IcelandEruption

Iceland's daily paper front page from 15th January 2024 which shows a photo of the lava flows close to the city Grindavik.

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 21/11/2023

I totally agree. I have observed similar problems in metamorphic rocks with Zr-in-titanite, and Ti-in-biotite has a well known problem. I always was critical of how this is handled in igneous rocks where TiO2 may sometimes be saturated or variously undersaturated as the magma evolves 😬

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 02/11/2023

These poor garnets have been through a lot! Sliced and sheared to bit on their journey in an ancient subduction zone. Maybe they will tell us about what happened to them? Fingers crossed! ⚒️

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Reposted by Jesse ‘Πέτρος’ Walters

Samuele Papeschi サムエレパペスキ | Geology is the way ⚒️🧪 @calamitaman.bsky.social · 30/10/2023

Some very sexy folds in flysch deposits (sandstone and shale layers) to let you start your Monday better! ⚒️ ⛏ Macigno sandstone 🕑 Oligocene - Lower Miocene 🧭 Vernazza, Cinque Terre, Italy

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Dr Dan Shugar 🇨🇦 @watershedlab.bsky.social · 29/10/2023

Bluesky tip: post a 🧪to get picked up on science feeds and a ⚒️ for geoscience

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Reposted by Jesse ‘Πέτρος’ Walters

Anise K. Strong @anisekstrong.bsky.social · 26/10/2023

Perpetuated significantly by stark increases in income inequality and elitist oligarchs choosing to spend their money on personal vanity projects rather than on benefiting their larger communities?

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Jesse ‘Πέτρος’ Walters @thegeojesse.bsky.social · 26/10/2023

I learned by making A LOT of mistakes over the past 12 years of thermodynamic modeling.

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