Tim Demko
@timdemko.xyz
Geologist interested in the energy transition, bicycling, and public service
https://bio.link/timdemko
https://orcid.org/0000-0002-9125-0907
https://www.semanticscholar.org/author/Timothy-Michael-Demko/15743754
https://bio.link/timdemko
https://orcid.org/0000-0002-9125-0907
https://www.semanticscholar.org/author/Timothy-Michael-Demko/15743754
Reposted by Tim Demko
New paper in JSP! Müller 𝘦𝘵 𝘢𝘭. describe 𝙏𝙖𝙞𝙣𝙧𝙖𝙠𝙪𝙖𝙨𝙪𝙘𝙝𝙪𝙨 𝙗𝙚𝙡𝙡𝙖𝙩𝙤𝙧 gen. et sp. nov. in 'Osteology, taxonomy and phylogenetic affinities of a new pseudosuchian archosaur from the Middle Triassic of southern Brazil.'
Read more here: buff.ly/Kxti2jj #PaleoSky #NewSpecies
Read more here: buff.ly/Kxti2jj #PaleoSky #NewSpecies
November 24, 2025 at 8:00 AM
New paper in JSP! Müller 𝘦𝘵 𝘢𝘭. describe 𝙏𝙖𝙞𝙣𝙧𝙖𝙠𝙪𝙖𝙨𝙪𝙘𝙝𝙪𝙨 𝙗𝙚𝙡𝙡𝙖𝙩𝙤𝙧 gen. et sp. nov. in 'Osteology, taxonomy and phylogenetic affinities of a new pseudosuchian archosaur from the Middle Triassic of southern Brazil.'
Read more here: buff.ly/Kxti2jj #PaleoSky #NewSpecies
Read more here: buff.ly/Kxti2jj #PaleoSky #NewSpecies
Reposted by Tim Demko
New paper on the notosuchian Eremosuchus by @piginatutu.bsky.social, co-authored by myself and @pdmannion.bsky.social among others out now!! We even find some cool evidence of replacement teeth in the dentary! www.tandfonline.com/doi/full/10....
A re-evaluation of the notosuchian crocodyliform Eremosuchus elkoholicus from the lower Eocene of Algeria and the evolutionary and biogeographic history of sebecids
Notosuchian systematics have been highly debated in recent decades, particularly the placement of sebecids and closely related species. As the only notosuchian lineage to have survived the Cretaceo...
www.tandfonline.com
November 24, 2025 at 9:13 AM
New paper on the notosuchian Eremosuchus by @piginatutu.bsky.social, co-authored by myself and @pdmannion.bsky.social among others out now!! We even find some cool evidence of replacement teeth in the dentary! www.tandfonline.com/doi/full/10....
Reposted by Tim Demko
Geologic Core Sample
xkcd.com
November 23, 2025 at 1:48 PM
Reposted by Tim Demko
⚒️🍎🧪🌋
Every Rock Has A Story is coming back with new episodes from HAWAII starting in December! Episode 83 is about the tephra that erupted in June 2023 from the Kilauea volcano.
Share it with kids, parents, and teachers you know!
youtube.com/shorts/r33KX...
Every Rock Has A Story is coming back with new episodes from HAWAII starting in December! Episode 83 is about the tephra that erupted in June 2023 from the Kilauea volcano.
Share it with kids, parents, and teachers you know!
youtube.com/shorts/r33KX...
See the foamy Kilauea lava rock that blasted out of the volcano on June 7, 2023!
YouTube video by Ethan Baxter's "Every Rock Has A Story"
youtube.com
November 22, 2025 at 3:51 PM
⚒️🍎🧪🌋
Every Rock Has A Story is coming back with new episodes from HAWAII starting in December! Episode 83 is about the tephra that erupted in June 2023 from the Kilauea volcano.
Share it with kids, parents, and teachers you know!
youtube.com/shorts/r33KX...
Every Rock Has A Story is coming back with new episodes from HAWAII starting in December! Episode 83 is about the tephra that erupted in June 2023 from the Kilauea volcano.
Share it with kids, parents, and teachers you know!
youtube.com/shorts/r33KX...
Reposted by Tim Demko
A Nonergodic Ground‐Motion Model for Türkiye #BSSA ⚒️
A new ground motion model takes into account effects related to earthquake source, site of the measurement or structure where motion manifests, and the path seismic waves take to get between the two.
pubs.geoscienceworld.org/ssa/bssa/art...
A new ground motion model takes into account effects related to earthquake source, site of the measurement or structure where motion manifests, and the path seismic waves take to get between the two.
pubs.geoscienceworld.org/ssa/bssa/art...
November 22, 2025 at 2:02 PM
A Nonergodic Ground‐Motion Model for Türkiye #BSSA ⚒️
A new ground motion model takes into account effects related to earthquake source, site of the measurement or structure where motion manifests, and the path seismic waves take to get between the two.
pubs.geoscienceworld.org/ssa/bssa/art...
A new ground motion model takes into account effects related to earthquake source, site of the measurement or structure where motion manifests, and the path seismic waves take to get between the two.
pubs.geoscienceworld.org/ssa/bssa/art...
Reposted by Tim Demko
Reposted by Tim Demko
Recently finished up my last freelance work of the year before moving on to a mad sprint of book writing, so —rather earlier than usual — it's time for my year in review! Here, in no particular order, are the features I'm proudest of.
November 21, 2025 at 12:45 PM
Recently finished up my last freelance work of the year before moving on to a mad sprint of book writing, so —rather earlier than usual — it's time for my year in review! Here, in no particular order, are the features I'm proudest of.
Reposted by Tim Demko
November 21, 2025 at 10:32 PM
Reposted by Tim Demko
A lot of folks, including kids, who saw my speech on Tuesday really liked it and thought it was helpful, so I thought I'd post it online - it's an overview of just how nonlinear my path to science was. Maybe it'll help you or someone you know too: medium.com/@adeene.dent...
A Planetary Scientist’s Guide to Finding Your Momentum
This essay is adapted from a speech I gave at my local high school on November 18, 2025. If you’re a kid, have a kid, or just need a…
medium.com
November 21, 2025 at 7:21 PM
A lot of folks, including kids, who saw my speech on Tuesday really liked it and thought it was helpful, so I thought I'd post it online - it's an overview of just how nonlinear my path to science was. Maybe it'll help you or someone you know too: medium.com/@adeene.dent...
Reposted by Tim Demko
What might be my favourite fossil has been just published by Kiat et al. 2025. Years ago I saw a pic of this Anchiornis specimen in nat geo article and I audibly gasped.preserving not only the feathers but also the original patterns as well. I made this drawing on the spot. Maybe its time to do v2.0
November 21, 2025 at 7:27 PM
What might be my favourite fossil has been just published by Kiat et al. 2025. Years ago I saw a pic of this Anchiornis specimen in nat geo article and I audibly gasped.preserving not only the feathers but also the original patterns as well. I made this drawing on the spot. Maybe its time to do v2.0
Reposted by Tim Demko
A group of Dorygnathus use a Seirocrinus raft as a hunting ground for fish, when a big Eurhinosaurus suddenly breaches the surface.
This scene takes place in Germany during the Early Jurassic, around 180 million years ago.
Digital painting by Peter Nickolaus, 2025.
This scene takes place in Germany during the Early Jurassic, around 180 million years ago.
Digital painting by Peter Nickolaus, 2025.
November 21, 2025 at 8:08 PM
A group of Dorygnathus use a Seirocrinus raft as a hunting ground for fish, when a big Eurhinosaurus suddenly breaches the surface.
This scene takes place in Germany during the Early Jurassic, around 180 million years ago.
Digital painting by Peter Nickolaus, 2025.
This scene takes place in Germany during the Early Jurassic, around 180 million years ago.
Digital painting by Peter Nickolaus, 2025.
Reposted by Tim Demko
Rock glaciers (creeping bodies made of a mixture of scree and interstitial ice), flow at lower speed than glaciers, typically few dm/yr 🧊
Here are 8 yrs of RG surface change on the Dos Lenguas RG (Dry Argentinean Andes), at 11 cm resolution!! 💪
Data: Melanie Stammler 🙏
1/
Here are 8 yrs of RG surface change on the Dos Lenguas RG (Dry Argentinean Andes), at 11 cm resolution!! 💪
Data: Melanie Stammler 🙏
1/
November 21, 2025 at 12:36 PM
Rock glaciers (creeping bodies made of a mixture of scree and interstitial ice), flow at lower speed than glaciers, typically few dm/yr 🧊
Here are 8 yrs of RG surface change on the Dos Lenguas RG (Dry Argentinean Andes), at 11 cm resolution!! 💪
Data: Melanie Stammler 🙏
1/
Here are 8 yrs of RG surface change on the Dos Lenguas RG (Dry Argentinean Andes), at 11 cm resolution!! 💪
Data: Melanie Stammler 🙏
1/
Reposted by Tim Demko
Semeru, Indonesia is erupting. Communities are being evacuated.
Incredible footage of pyroclastic density currents in the news.
youtube.com/watch?v=ducv...
Incredible footage of pyroclastic density currents in the news.
youtube.com/watch?v=ducv...
Indonesia's Mount Semeru erupts and covers villages with falling ash
YouTube video by Associated Press
youtube.com
November 20, 2025 at 10:26 PM
Semeru, Indonesia is erupting. Communities are being evacuated.
Incredible footage of pyroclastic density currents in the news.
youtube.com/watch?v=ducv...
Incredible footage of pyroclastic density currents in the news.
youtube.com/watch?v=ducv...
Reposted by Tim Demko
Yes, you CAN go back in time! This StoryMap allows readers to experience several hundred million years of Earth history in just minutes with a scroll-driven animation. Happy GIS Day too!
ow.ly/ZjFV50XsVbc
Want to know how the team did it?
ow.ly/gC3k50XsVQY
⚒️ 🧪 #gischat #geogsky #geogchat 🌎 🌍 🌏
ow.ly/ZjFV50XsVbc
Want to know how the team did it?
ow.ly/gC3k50XsVQY
⚒️ 🧪 #gischat #geogsky #geogchat 🌎 🌍 🌏
November 20, 2025 at 8:24 PM
Yes, you CAN go back in time! This StoryMap allows readers to experience several hundred million years of Earth history in just minutes with a scroll-driven animation. Happy GIS Day too!
ow.ly/ZjFV50XsVbc
Want to know how the team did it?
ow.ly/gC3k50XsVQY
⚒️ 🧪 #gischat #geogsky #geogchat 🌎 🌍 🌏
ow.ly/ZjFV50XsVbc
Want to know how the team did it?
ow.ly/gC3k50XsVQY
⚒️ 🧪 #gischat #geogsky #geogchat 🌎 🌍 🌏
Reposted by Tim Demko
I've had a missile blow up next to my airplane, been shot at dozens of times by anti-aircraft fire, and launched into orbit — all for my country. I never thought I'd see a President call for my execution.
Trump doesn’t understand the Constitution, and we're all less safe for it.
Trump doesn’t understand the Constitution, and we're all less safe for it.
November 20, 2025 at 8:40 PM
I've had a missile blow up next to my airplane, been shot at dozens of times by anti-aircraft fire, and launched into orbit — all for my country. I never thought I'd see a President call for my execution.
Trump doesn’t understand the Constitution, and we're all less safe for it.
Trump doesn’t understand the Constitution, and we're all less safe for it.
Reposted by Tim Demko
It's very disorienting to be experiencing scientific success right now, after years of being told to either quit science or switch to a "less quantitatively rigorous" subfield! Thank you so, so much to the many folks who saw my potential and encouraged me to disregard that so I could keep going.
November 20, 2025 at 8:45 PM
It's very disorienting to be experiencing scientific success right now, after years of being told to either quit science or switch to a "less quantitatively rigorous" subfield! Thank you so, so much to the many folks who saw my potential and encouraged me to disregard that so I could keep going.
Reposted by Tim Demko
One of the tragedies of growing up is it's apparently no longer "socially acceptable" to carry around a cool rock & show it to people you meet.
So I have to respect the Chinese, Korean & Japanese for having a tradition of finding cool rocks & displaying them.
Let's talk about scholar's stones.
So I have to respect the Chinese, Korean & Japanese for having a tradition of finding cool rocks & displaying them.
Let's talk about scholar's stones.
November 20, 2025 at 2:12 PM
One of the tragedies of growing up is it's apparently no longer "socially acceptable" to carry around a cool rock & show it to people you meet.
So I have to respect the Chinese, Korean & Japanese for having a tradition of finding cool rocks & displaying them.
Let's talk about scholar's stones.
So I have to respect the Chinese, Korean & Japanese for having a tradition of finding cool rocks & displaying them.
Let's talk about scholar's stones.
Reposted by Tim Demko
Understanding of Earth Sciences is fundamental to society's sustainability and development. Please support the department at the University of Leicester which is under threat. ⚒️🧪
c.org/jzkHKh9byy
c.org/jzkHKh9byy
Sign the Petition
Save Geology at the University of Leicester
c.org
November 19, 2025 at 12:39 PM
Understanding of Earth Sciences is fundamental to society's sustainability and development. Please support the department at the University of Leicester which is under threat. ⚒️🧪
c.org/jzkHKh9byy
c.org/jzkHKh9byy
Reposted by Tim Demko
🚨New paper alert!🚨
Tooth replacement rates in ancient reptile clades revealed through histology
It brings tooth growth line counts from pterosaurs, dinosaurs, crocodyliforms, and mosasaurs
anatomypubs.onlinelibrary.wiley.com/doi/10.1002/...
Tooth replacement rates in ancient reptile clades revealed through histology
It brings tooth growth line counts from pterosaurs, dinosaurs, crocodyliforms, and mosasaurs
anatomypubs.onlinelibrary.wiley.com/doi/10.1002/...
November 19, 2025 at 2:09 PM
🚨New paper alert!🚨
Tooth replacement rates in ancient reptile clades revealed through histology
It brings tooth growth line counts from pterosaurs, dinosaurs, crocodyliforms, and mosasaurs
anatomypubs.onlinelibrary.wiley.com/doi/10.1002/...
Tooth replacement rates in ancient reptile clades revealed through histology
It brings tooth growth line counts from pterosaurs, dinosaurs, crocodyliforms, and mosasaurs
anatomypubs.onlinelibrary.wiley.com/doi/10.1002/...
Reposted by Tim Demko
Um novo registro de dinossauro terópode e pegadas do Cretáceo Inferior da Bacia do Triunfo, Nordeste do Brasil www.tandfonline.com/doi/full/10....
A new theropod dinosaur record and footprints from the Lower Cretaceous of the Triunfo Basin, northeastern Brazil
The Triunfo Basin (Uiraúna-Brejo das Freiras Basin) is part of the Rio do Peixe Basin Complex, an extensive megatracksite from the Lower Cretaceous. Hundreds of footprints and trackways of theropod...
www.tandfonline.com
November 19, 2025 at 8:05 AM
Um novo registro de dinossauro terópode e pegadas do Cretáceo Inferior da Bacia do Triunfo, Nordeste do Brasil www.tandfonline.com/doi/full/10....
Reposted by Tim Demko
Good news everyone!
Alaska Earthquake Center’s 15-month Gen 3 overhaul modernizes how AK quakes are detected/shared. The open-source system links 250 stations, improves real-time mapping and workflows, and sets up tools that can help communities understand shaking sooner
🧪⚒️
#Earthquake
#Seismology
Alaska Earthquake Center’s 15-month Gen 3 overhaul modernizes how AK quakes are detected/shared. The open-source system links 250 stations, improves real-time mapping and workflows, and sets up tools that can help communities understand shaking sooner
🧪⚒️
#Earthquake
#Seismology
A Complete Overhaul—Under the Hood | Alaska Earthquake Center
You might not notice as you browse through our interactive map and events list, but the Alaska Earthquake Center has completely rebuilt the engine that drives this information.
earthquake.alaska.edu
November 19, 2025 at 3:03 AM
Good news everyone!
Alaska Earthquake Center’s 15-month Gen 3 overhaul modernizes how AK quakes are detected/shared. The open-source system links 250 stations, improves real-time mapping and workflows, and sets up tools that can help communities understand shaking sooner
🧪⚒️
#Earthquake
#Seismology
Alaska Earthquake Center’s 15-month Gen 3 overhaul modernizes how AK quakes are detected/shared. The open-source system links 250 stations, improves real-time mapping and workflows, and sets up tools that can help communities understand shaking sooner
🧪⚒️
#Earthquake
#Seismology
Reposted by Tim Demko
What is the relationship between a 2017 magnitude 4.0 lower crustal earthquake and shallow seismicity in the Yanzhou coal mining area in China? #SRL ⚒️
pubs.geoscienceworld.org/ssa/srl/arti...
pubs.geoscienceworld.org/ssa/srl/arti...
November 19, 2025 at 3:00 AM
What is the relationship between a 2017 magnitude 4.0 lower crustal earthquake and shallow seismicity in the Yanzhou coal mining area in China? #SRL ⚒️
pubs.geoscienceworld.org/ssa/srl/arti...
pubs.geoscienceworld.org/ssa/srl/arti...
Reposted by Tim Demko
Deep-sea mining in the Clarion-Clipperton Zone may release waste into midwaters that support diverse marine life. A study in Nature Communications finds such discharges could dilute key food particles and disrupt trophic links from zooplankton to large marine predators. go.nature.com/3Jm0C2U 🌊 🧪
November 19, 2025 at 2:43 AM
Deep-sea mining in the Clarion-Clipperton Zone may release waste into midwaters that support diverse marine life. A study in Nature Communications finds such discharges could dilute key food particles and disrupt trophic links from zooplankton to large marine predators. go.nature.com/3Jm0C2U 🌊 🧪
Reposted by Tim Demko
Who was in your high school graduating class, +/- two years, that would be of interest?
For example, I took a basketball class and graduated w/all-time 8th man Jud Buechler (look it up), and may have followed Stephanie Seymour (not sure if she still WENT to school after I moved there).
For example, I took a basketball class and graduated w/all-time 8th man Jud Buechler (look it up), and may have followed Stephanie Seymour (not sure if she still WENT to school after I moved there).
November 18, 2025 at 10:11 PM
Who was in your high school graduating class, +/- two years, that would be of interest?
For example, I took a basketball class and graduated w/all-time 8th man Jud Buechler (look it up), and may have followed Stephanie Seymour (not sure if she still WENT to school after I moved there).
For example, I took a basketball class and graduated w/all-time 8th man Jud Buechler (look it up), and may have followed Stephanie Seymour (not sure if she still WENT to school after I moved there).
Reposted by Tim Demko
American Mineralogist:
The transformation of magnesium phosphate minerals at atmospheric conditions: Mechanisms, kinetics, and environmental applications
Rebecca Volkmann, Roberts Blukis, Christian Schmidt, Pablo Forjanes, and Liane G. Benning
doi.org/10.2138/am-2...
The transformation of magnesium phosphate minerals at atmospheric conditions: Mechanisms, kinetics, and environmental applications
Rebecca Volkmann, Roberts Blukis, Christian Schmidt, Pablo Forjanes, and Liane G. Benning
doi.org/10.2138/am-2...
November 18, 2025 at 5:26 PM
American Mineralogist:
The transformation of magnesium phosphate minerals at atmospheric conditions: Mechanisms, kinetics, and environmental applications
Rebecca Volkmann, Roberts Blukis, Christian Schmidt, Pablo Forjanes, and Liane G. Benning
doi.org/10.2138/am-2...
The transformation of magnesium phosphate minerals at atmospheric conditions: Mechanisms, kinetics, and environmental applications
Rebecca Volkmann, Roberts Blukis, Christian Schmidt, Pablo Forjanes, and Liane G. Benning
doi.org/10.2138/am-2...