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
U-Pb calcite age dating of fossil eggshell as an accurate deep time geochronometer 🧪⚒️
www.nature.com/articles/s43...
www.nature.com/articles/s43...
U-Pb calcite age dating of fossil eggshell as an accurate deep time geochronometer - Communications Earth & Environment
Biogenic carbonate of eggshells can be used as a new geochronometer through direct calcite U-Pb dating, producing high accurate ages, as revealed by two tests on dinosaur eggs from North America and M...
www.nature.com
November 11, 2025 at 10:26 PM
U-Pb calcite age dating of fossil eggshell as an accurate deep time geochronometer 🧪⚒️
www.nature.com/articles/s43...
www.nature.com/articles/s43...
Reposted by Tim Demko
Fly along the San Andreas Fault in Southern California from the Cajon pass to Palmdale.
Faults are rarely one single fault strand; they are often broad areas of deformation called fault zones.
Lots of critical infrastructure like highways, powerlines, and railroads cross the San Andreas Fault.
Faults are rarely one single fault strand; they are often broad areas of deformation called fault zones.
Lots of critical infrastructure like highways, powerlines, and railroads cross the San Andreas Fault.
November 11, 2025 at 4:28 PM
Fly along the San Andreas Fault in Southern California from the Cajon pass to Palmdale.
Faults are rarely one single fault strand; they are often broad areas of deformation called fault zones.
Lots of critical infrastructure like highways, powerlines, and railroads cross the San Andreas Fault.
Faults are rarely one single fault strand; they are often broad areas of deformation called fault zones.
Lots of critical infrastructure like highways, powerlines, and railroads cross the San Andreas Fault.
Reposted by Tim Demko
⚒️ Article: Convective erosion and lateral transport of metasomatized continental keels may generate enriched mantle geochemical domains
@gernon.bsky.social @unisouthampton.bsky.social @ukiodp.bsky.social
www.nature.com/articles/s41...
@gernon.bsky.social @unisouthampton.bsky.social @ukiodp.bsky.social
www.nature.com/articles/s41...
November 11, 2025 at 4:00 PM
⚒️ Article: Convective erosion and lateral transport of metasomatized continental keels may generate enriched mantle geochemical domains
@gernon.bsky.social @unisouthampton.bsky.social @ukiodp.bsky.social
www.nature.com/articles/s41...
@gernon.bsky.social @unisouthampton.bsky.social @ukiodp.bsky.social
www.nature.com/articles/s41...
Reposted by Tim Demko
Os pterossauros estão tristes com tanta imagem de IA :(
Mas segue mais uma notícia divulgando nosso estudo
olhardigital.com.br/2025/11/11/c...
Mas segue mais uma notícia divulgando nosso estudo
olhardigital.com.br/2025/11/11/c...
Fóssil de vômito revela espécie de dinossauro no Nordeste do Brasil
Fragmentos preservados em vômito fossilizado revelaram o Bakiribu waridza, pterossauro que viveu há 110 milhões de anos no Araripe (CE)
olhardigital.com.br
November 11, 2025 at 4:31 PM
Os pterossauros estão tristes com tanta imagem de IA :(
Mas segue mais uma notícia divulgando nosso estudo
olhardigital.com.br/2025/11/11/c...
Mas segue mais uma notícia divulgando nosso estudo
olhardigital.com.br/2025/11/11/c...
Reposted by Tim Demko
The ISU GeoClub is hosting their 3rd Annual Mineral ID Fest!
Bring a rock, mineral, or fossil to the Physical Science Building Room 220 on Thursday, November 13, from 5:30 to 7:30 p.m. to have it identified by geosciences students and faculty.
#idahostateucose #STEM #geology #geosciences
Bring a rock, mineral, or fossil to the Physical Science Building Room 220 on Thursday, November 13, from 5:30 to 7:30 p.m. to have it identified by geosciences students and faculty.
#idahostateucose #STEM #geology #geosciences
November 10, 2025 at 10:51 PM
The ISU GeoClub is hosting their 3rd Annual Mineral ID Fest!
Bring a rock, mineral, or fossil to the Physical Science Building Room 220 on Thursday, November 13, from 5:30 to 7:30 p.m. to have it identified by geosciences students and faculty.
#idahostateucose #STEM #geology #geosciences
Bring a rock, mineral, or fossil to the Physical Science Building Room 220 on Thursday, November 13, from 5:30 to 7:30 p.m. to have it identified by geosciences students and faculty.
#idahostateucose #STEM #geology #geosciences
Reposted by Tim Demko
🚨Another new paper alert!! 🚨
We present the first histological analysis of an ornithocheirid pterosaur tooth from Brazil’s Crato Formation, revealing exceptionally rapid tooth growth and thin enamel adapted for efficient replacement.
anatomypubs.onlinelibrary.wiley.com/doi/10.1002/...
We present the first histological analysis of an ornithocheirid pterosaur tooth from Brazil’s Crato Formation, revealing exceptionally rapid tooth growth and thin enamel adapted for efficient replacement.
anatomypubs.onlinelibrary.wiley.com/doi/10.1002/...
Histology and fossil diagenesis of a pterosaur tooth from the Crato Formation (Lower Cretaceous of Brazil)
Pterosaur dental biology remains poorly understood despite its importance for comprehending feeding strategies and flight adaptations. Here, we present the first comprehensive histological analysis o....
anatomypubs.onlinelibrary.wiley.com
November 11, 2025 at 12:39 PM
🚨Another new paper alert!! 🚨
We present the first histological analysis of an ornithocheirid pterosaur tooth from Brazil’s Crato Formation, revealing exceptionally rapid tooth growth and thin enamel adapted for efficient replacement.
anatomypubs.onlinelibrary.wiley.com/doi/10.1002/...
We present the first histological analysis of an ornithocheirid pterosaur tooth from Brazil’s Crato Formation, revealing exceptionally rapid tooth growth and thin enamel adapted for efficient replacement.
anatomypubs.onlinelibrary.wiley.com/doi/10.1002/...
Reposted by Tim Demko
When people say "There weren't many women in palaeontology/palaeoart in the 19 & 20th century" they pretend that women in the Central & East Europe did not exist, despite ladies ruling the show in that corner of the world for a century.
November 11, 2025 at 5:14 AM
When people say "There weren't many women in palaeontology/palaeoart in the 19 & 20th century" they pretend that women in the Central & East Europe did not exist, despite ladies ruling the show in that corner of the world for a century.
Reposted by Tim Demko
Reposted by Tim Demko
Did you know. That the meme-explosion that was the wooden model of Sacabambaspis (an Ordovician jawless fish) held at a Museum in Helsinki, was created by a pioneering Estonian fish paleontologist and palaeoartist, Elga Mark-Kurik. 🧵
November 11, 2025 at 4:08 AM
Did you know. That the meme-explosion that was the wooden model of Sacabambaspis (an Ordovician jawless fish) held at a Museum in Helsinki, was created by a pioneering Estonian fish paleontologist and palaeoartist, Elga Mark-Kurik. 🧵
Reposted by Tim Demko
A view of the mid-Tertiary andesitic porphyry of Cristo Rey in El Paso, straddling the Mexican-US border. The laccolith intruded into Cretaceous sediments, pushing them apart. @riceeeps.bsky.social @riceuniversity.bsky.social geology field trip to west texas
November 11, 2025 at 4:21 AM
A view of the mid-Tertiary andesitic porphyry of Cristo Rey in El Paso, straddling the Mexican-US border. The laccolith intruded into Cretaceous sediments, pushing them apart. @riceeeps.bsky.social @riceuniversity.bsky.social geology field trip to west texas
Reposted by Tim Demko
You know paleo artist Doug Henderson's 🎨 dinosaurs, but he is a brilliant illustrator of ALL things prehistoric! Check out his 'stem mammals'!
To hear more about Doug's inspiration, techniques, and more, listen to episode #91:
🔊 www.paleonerds.com/podcast/doug...
To hear more about Doug's inspiration, techniques, and more, listen to episode #91:
🔊 www.paleonerds.com/podcast/doug...
November 10, 2025 at 3:44 PM
You know paleo artist Doug Henderson's 🎨 dinosaurs, but he is a brilliant illustrator of ALL things prehistoric! Check out his 'stem mammals'!
To hear more about Doug's inspiration, techniques, and more, listen to episode #91:
🔊 www.paleonerds.com/podcast/doug...
To hear more about Doug's inspiration, techniques, and more, listen to episode #91:
🔊 www.paleonerds.com/podcast/doug...
Reposted by Tim Demko
November 10, 2025 at 7:58 PM
Reposted by Tim Demko
A pilgrimage I have not made for many years – Hutton’s Unconformity at Lochranza, Arran. The site where Hutton could finally prove the earth was unimaginably ancient. A place of deep history in every way.
November 10, 2025 at 4:16 PM
A pilgrimage I have not made for many years – Hutton’s Unconformity at Lochranza, Arran. The site where Hutton could finally prove the earth was unimaginably ancient. A place of deep history in every way.
Reposted by Tim Demko
New paper out 🥳 If you care about data management in geosciences - or believe in #OpenScience and #FAIRdata - this is a must-read. Although the Nansen Legacy project was a marine science project, the practices we discuss are broadly applicable across the geosciences.
doi.org/10.5194/essd...
doi.org/10.5194/essd...
November 10, 2025 at 10:59 AM
New paper out 🥳 If you care about data management in geosciences - or believe in #OpenScience and #FAIRdata - this is a must-read. Although the Nansen Legacy project was a marine science project, the practices we discuss are broadly applicable across the geosciences.
doi.org/10.5194/essd...
doi.org/10.5194/essd...
Reposted by Tim Demko
And found in the best curling stones from Ailsa Craig geoscienceinfo.com/curling-ston... www.virtualmicroscope.org/content/rieb...
November 10, 2025 at 11:06 AM
And found in the best curling stones from Ailsa Craig geoscienceinfo.com/curling-ston... www.virtualmicroscope.org/content/rieb...
Reposted by Tim Demko
New Paper Alert! 🚨 2nd of 2 #UndergraduateResearch studies led by a past #EMU #Geology student! Schmidt Hammer dating didn't work for us in the #GreatLakes. We muse on why we think our 'negative results' are still useful! #EarthScience #Glacial #Geochronology
onlinelibrary.wiley.com/doi/10.1002/...
onlinelibrary.wiley.com/doi/10.1002/...
Challenges in developing a Schmidt hammer exposure‐age dating calibration curve from glacial erratics in the North American Great Lakes
Against expectations, mean Schmidt hammer R-values measured on 34 glacial erratics across six moraines in Wisconsin exhibit no meaningful relationship to independently determined cosmogenic 10Be expo...
onlinelibrary.wiley.com
November 10, 2025 at 2:27 PM
New Paper Alert! 🚨 2nd of 2 #UndergraduateResearch studies led by a past #EMU #Geology student! Schmidt Hammer dating didn't work for us in the #GreatLakes. We muse on why we think our 'negative results' are still useful! #EarthScience #Glacial #Geochronology
onlinelibrary.wiley.com/doi/10.1002/...
onlinelibrary.wiley.com/doi/10.1002/...
Reposted by Tim Demko
Coseismic Deformation and Slip Distribution of the 2024 Mw 7.0 Wushi, Xinjiang, Earthquake from High‐Rate GNSS #SRL ⚒️
What was the orientation and depth of motion of the 2024 Wushi earthquake?
pubs.geoscienceworld.org/ssa/srl/arti...
What was the orientation and depth of motion of the 2024 Wushi earthquake?
pubs.geoscienceworld.org/ssa/srl/arti...
November 10, 2025 at 3:04 PM
Coseismic Deformation and Slip Distribution of the 2024 Mw 7.0 Wushi, Xinjiang, Earthquake from High‐Rate GNSS #SRL ⚒️
What was the orientation and depth of motion of the 2024 Wushi earthquake?
pubs.geoscienceworld.org/ssa/srl/arti...
What was the orientation and depth of motion of the 2024 Wushi earthquake?
pubs.geoscienceworld.org/ssa/srl/arti...
Reposted by Tim Demko
A Brazilian Pterodaustro-like thingie found in a putative regurgitalite (that is a fossil vomit, yes), probably from a spinosaur
Fantastic!
@titoaureliano.bsky.social @alinemghilardi.bsky.social
www.nature.com/articles/s41...
Fantastic!
@titoaureliano.bsky.social @alinemghilardi.bsky.social
www.nature.com/articles/s41...
A regurgitalite reveals a new filter-feeding pterosaur from the Santana Group - Scientific Reports
Scientific Reports - A regurgitalite reveals a new filter-feeding pterosaur from the Santana Group
www.nature.com
November 10, 2025 at 4:22 PM
A Brazilian Pterodaustro-like thingie found in a putative regurgitalite (that is a fossil vomit, yes), probably from a spinosaur
Fantastic!
@titoaureliano.bsky.social @alinemghilardi.bsky.social
www.nature.com/articles/s41...
Fantastic!
@titoaureliano.bsky.social @alinemghilardi.bsky.social
www.nature.com/articles/s41...
Reposted by Tim Demko
It's actually super easy to talk to people about how outer space is political! Especially now, when people's curiosity is accompanied by a growing concern about whether space exploration is causing more harm than good. If you're doing outreach talks, I recommend having these discussions!
November 10, 2025 at 4:16 PM
It's actually super easy to talk to people about how outer space is political! Especially now, when people's curiosity is accompanied by a growing concern about whether space exploration is causing more harm than good. If you're doing outreach talks, I recommend having these discussions!
Reposted by Tim Demko
Oxford University: Saturn’s Icy Moon May Host a Stable Ocean Fit for Life www.ox.ac.uk/news/2025-11...
Saturn’s icy moon may host a stable ocean fit for life, new study
New findings from NASA’s Cassini mission show that Enceladus, one of Saturn’s moons and a top contender for extra-terrestrial life, is losing heat from both poles – indicating that it has the
www.ox.ac.uk
November 10, 2025 at 4:09 PM
Oxford University: Saturn’s Icy Moon May Host a Stable Ocean Fit for Life www.ox.ac.uk/news/2025-11...
Reposted by Tim Demko
🚨New Paper: "History of the Barents Sea Ice Sheet, MIS 11 to present" - Cofield & Darby (2025)
Utilized ice rafted debris + Fe-grains from a deep-sea Arctic sediment core to reconstruct ice movement/ timing for Barents Sea Ice Sheet through MIS 11 (~440 ka).
*Proxy explanation in🧵
(1/n) 🌊🧪
Utilized ice rafted debris + Fe-grains from a deep-sea Arctic sediment core to reconstruct ice movement/ timing for Barents Sea Ice Sheet through MIS 11 (~440 ka).
*Proxy explanation in🧵
(1/n) 🌊🧪
History of the Barents Sea Ice Sheet, MIS 11 to present
Understanding the history of large Arctic ice sheets is important in knowing the possibilities for future climate change and its impact on existing ic…
www.sciencedirect.com
November 10, 2025 at 2:34 PM
🚨New Paper: "History of the Barents Sea Ice Sheet, MIS 11 to present" - Cofield & Darby (2025)
Utilized ice rafted debris + Fe-grains from a deep-sea Arctic sediment core to reconstruct ice movement/ timing for Barents Sea Ice Sheet through MIS 11 (~440 ka).
*Proxy explanation in🧵
(1/n) 🌊🧪
Utilized ice rafted debris + Fe-grains from a deep-sea Arctic sediment core to reconstruct ice movement/ timing for Barents Sea Ice Sheet through MIS 11 (~440 ka).
*Proxy explanation in🧵
(1/n) 🌊🧪
Reposted by Tim Demko
The underwater seismometer network is so great, as evidenced from yesterday's EQ off-Tohoku.
Reposting unofficial visualization by x.com/kotoho76/sta...
Reposting unofficial visualization by x.com/kotoho76/sta...
November 10, 2025 at 6:56 AM
The underwater seismometer network is so great, as evidenced from yesterday's EQ off-Tohoku.
Reposting unofficial visualization by x.com/kotoho76/sta...
Reposting unofficial visualization by x.com/kotoho76/sta...
Reposted by Tim Demko
Oh look, it is possible to massive offshore deployments of seismometers after all!
Would *never* know it from how the US has been (not) instrumenting Alaska and Cascadia.
It's kind of like green energy: the US has behaved lackadaisically for 20+ years while other countries actually improve.
Would *never* know it from how the US has been (not) instrumenting Alaska and Cascadia.
It's kind of like green energy: the US has behaved lackadaisically for 20+ years while other countries actually improve.
The underwater seismometer network is so great, as evidenced from yesterday's EQ off-Tohoku.
Reposting unofficial visualization by x.com/kotoho76/sta...
Reposting unofficial visualization by x.com/kotoho76/sta...
November 10, 2025 at 2:12 PM
Oh look, it is possible to massive offshore deployments of seismometers after all!
Would *never* know it from how the US has been (not) instrumenting Alaska and Cascadia.
It's kind of like green energy: the US has behaved lackadaisically for 20+ years while other countries actually improve.
Would *never* know it from how the US has been (not) instrumenting Alaska and Cascadia.
It's kind of like green energy: the US has behaved lackadaisically for 20+ years while other countries actually improve.
Reposted by Tim Demko
1/3 Well this is a first (for me): Native #copper replaces ancient cross-bedded sedimentary rock perfectly preserving the original cross-bedding. Copper does amazing stuff in Michigan. 🤯 More below! Pinging @richardgibson.bsky.social
#OreCup ⚒️ sci-fi 🧪 🖖🏼 scifi Geosciences #WomenInSTEM geology 🍎 🔭🪐
#OreCup ⚒️ sci-fi 🧪 🖖🏼 scifi Geosciences #WomenInSTEM geology 🍎 🔭🪐
November 10, 2025 at 2:59 PM
1/3 Well this is a first (for me): Native #copper replaces ancient cross-bedded sedimentary rock perfectly preserving the original cross-bedding. Copper does amazing stuff in Michigan. 🤯 More below! Pinging @richardgibson.bsky.social
#OreCup ⚒️ sci-fi 🧪 🖖🏼 scifi Geosciences #WomenInSTEM geology 🍎 🔭🪐
#OreCup ⚒️ sci-fi 🧪 🖖🏼 scifi Geosciences #WomenInSTEM geology 🍎 🔭🪐
Reposted by Tim Demko
!New #OpenAcess paper alert!
Late Pleistocene atmospheric dust dynamics reconstructed from sediment included in ice wedges from #Batagay and Central Yakutia:
www.nature.com/articles/s41...
Late Pleistocene atmospheric dust dynamics reconstructed from sediment included in ice wedges from #Batagay and Central Yakutia:
www.nature.com/articles/s41...
East Siberian ice wedges recording dust transport variability during the Late Pleistocene - Nature Communications
Dust preserved in Siberian ice wedges reveals shifts in wind patterns during the last glacial stage. Long-range dust transport from China to the Arctic operated under similar mechanisms as today but w...
www.nature.com
November 10, 2025 at 1:07 PM
!New #OpenAcess paper alert!
Late Pleistocene atmospheric dust dynamics reconstructed from sediment included in ice wedges from #Batagay and Central Yakutia:
www.nature.com/articles/s41...
Late Pleistocene atmospheric dust dynamics reconstructed from sediment included in ice wedges from #Batagay and Central Yakutia:
www.nature.com/articles/s41...