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
This is Miocene-aged amber containing the extinct ant Paraponera dieteri. It was a relative of the modern P. clavata...
...aka the bullet ant
...aka the bullet ant
January 17, 2026 at 11:15 PM
This is Miocene-aged amber containing the extinct ant Paraponera dieteri. It was a relative of the modern P. clavata...
...aka the bullet ant
...aka the bullet ant
Reposted by Tim Demko
Cool story (here it is freely archived archive.is/45tQd ) which combines fossil record and the stratigraphy of lahars in estimating giant mudflow risks.
The study: doi.org/10.1130/G537...
🧪 #Geology ⚒️ #Paleobio
The study: doi.org/10.1130/G537...
🧪 #Geology ⚒️ #Paleobio
January 17, 2026 at 4:01 PM
Cool story (here it is freely archived archive.is/45tQd ) which combines fossil record and the stratigraphy of lahars in estimating giant mudflow risks.
The study: doi.org/10.1130/G537...
🧪 #Geology ⚒️ #Paleobio
The study: doi.org/10.1130/G537...
🧪 #Geology ⚒️ #Paleobio
Reposted by Tim Demko
When @omearabrian.bsky.social saw the manuscript, he described it as: ‘What if this figure could be an entire paper?’
I choose to interpret that as high praise.
Now accepted at AmNat: The geometry of macroevolution (with Dan Rabosky). www.journals.uchicago.edu/doi/10.1086/...
I choose to interpret that as high praise.
Now accepted at AmNat: The geometry of macroevolution (with Dan Rabosky). www.journals.uchicago.edu/doi/10.1086/...
January 17, 2026 at 3:58 PM
When @omearabrian.bsky.social saw the manuscript, he described it as: ‘What if this figure could be an entire paper?’
I choose to interpret that as high praise.
Now accepted at AmNat: The geometry of macroevolution (with Dan Rabosky). www.journals.uchicago.edu/doi/10.1086/...
I choose to interpret that as high praise.
Now accepted at AmNat: The geometry of macroevolution (with Dan Rabosky). www.journals.uchicago.edu/doi/10.1086/...
Reposted by Tim Demko
Instant recognition of tracks from the Beneski Museum at Amherst College! #ichnology
January 16, 2026 at 2:59 AM
Instant recognition of tracks from the Beneski Museum at Amherst College! #ichnology
Reposted by Tim Demko
a REALLY cool paper was just posted that describes a new lagertätte from La Rioja Provence, Argentina: A extremophile microorganism site with 3d arthropod bits and plants in a Geothermal field. This site also produces large vertebrate material and sauropod nests. www.frontiersin.org/journals/eco...
January 17, 2026 at 6:12 AM
a REALLY cool paper was just posted that describes a new lagertätte from La Rioja Provence, Argentina: A extremophile microorganism site with 3d arthropod bits and plants in a Geothermal field. This site also produces large vertebrate material and sauropod nests. www.frontiersin.org/journals/eco...
Reposted by Tim Demko
🧪⚒️ A really interesting look at how recent discoveries are changing our understanding of bird evolution: “traits that would ultimately enable truly challenging aerial manoeuvres were already present or evolving in the late Jurassic world.”
How did birds evolve? The answer is wilder than anyone thought
Discoveries in Jurassic rocks reveal that birds were adept fliers earlier than scientists realized.
www.nature.com
January 17, 2026 at 11:36 PM
🧪⚒️ A really interesting look at how recent discoveries are changing our understanding of bird evolution: “traits that would ultimately enable truly challenging aerial manoeuvres were already present or evolving in the late Jurassic world.”
"Well she held a bass guitar and
She was playing in a band
And she stood just like Bill Wyman
Now I am her biggest fan"
"Behind the Wall of Sleep", The Smithereens
She was playing in a band
And she stood just like Bill Wyman
Now I am her biggest fan"
"Behind the Wall of Sleep", The Smithereens
January 18, 2026 at 1:06 AM
"Well she held a bass guitar and
She was playing in a band
And she stood just like Bill Wyman
Now I am her biggest fan"
"Behind the Wall of Sleep", The Smithereens
She was playing in a band
And she stood just like Bill Wyman
Now I am her biggest fan"
"Behind the Wall of Sleep", The Smithereens
Reposted by Tim Demko
Scientists Unearth Baby Dinosaur Fossils in a Remote Corner of the Frozen Arctic - Fossils buried deep in the Arctic ground are challenging a long-held belief about how dinosaurs lived, and where. dailygalaxy.com/2026/01/baby... #biology #palaeontology #science #SciChat
Scientists Unearth Baby Dinosaur Fossils in a Remote Corner of the Frozen Arctic
Fossils buried deep in the Arctic ground are challenging a long-held belief about how dinosaurs lived, and where.
dailygalaxy.com
January 16, 2026 at 6:38 PM
Scientists Unearth Baby Dinosaur Fossils in a Remote Corner of the Frozen Arctic - Fossils buried deep in the Arctic ground are challenging a long-held belief about how dinosaurs lived, and where. dailygalaxy.com/2026/01/baby... #biology #palaeontology #science #SciChat
Reposted by Tim Demko
This #FossilFriday, we travel to Bay St. George, #Newfoundland for #Carboniferous plants: Lepidodendron tree elements and an unidentified fern.
From the exhibits at @johnsongeocentre.bsky.social.
From the exhibits at @johnsongeocentre.bsky.social.
January 16, 2026 at 4:18 PM
This #FossilFriday, we travel to Bay St. George, #Newfoundland for #Carboniferous plants: Lepidodendron tree elements and an unidentified fern.
From the exhibits at @johnsongeocentre.bsky.social.
From the exhibits at @johnsongeocentre.bsky.social.
Reposted by Tim Demko
Orientation, Parcoursup, journées portes ouvertes.
Choix de spécialités en 2de et 1re, outils et aide à l’orientation
Rappels de sites incontournables et d’outils et ressources pour une orientation réussie… en SVT / géosciences
#géologie #géosciences #teamSVT
planet-terre.ens-lyon.fr/veille/breve...
Choix de spécialités en 2de et 1re, outils et aide à l’orientation
Rappels de sites incontournables et d’outils et ressources pour une orientation réussie… en SVT / géosciences
#géologie #géosciences #teamSVT
planet-terre.ens-lyon.fr/veille/breve...
January 16, 2026 at 7:23 AM
Orientation, Parcoursup, journées portes ouvertes.
Choix de spécialités en 2de et 1re, outils et aide à l’orientation
Rappels de sites incontournables et d’outils et ressources pour une orientation réussie… en SVT / géosciences
#géologie #géosciences #teamSVT
planet-terre.ens-lyon.fr/veille/breve...
Choix de spécialités en 2de et 1re, outils et aide à l’orientation
Rappels de sites incontournables et d’outils et ressources pour une orientation réussie… en SVT / géosciences
#géologie #géosciences #teamSVT
planet-terre.ens-lyon.fr/veille/breve...
Reposted by Tim Demko
Demain, pour la séance de 10h aux Étincelles du Palais (Paris 15e Balard) vous avez le choix :
- Les séismes en Géosciences
- Électrostatique en Physique
- Le monde des fourmis en sciences de la Vie
- Voyage dans le système solaire au Planétarium.
➡️ billetterie-etincelles.palais-decouverte.fr
- Les séismes en Géosciences
- Électrostatique en Physique
- Le monde des fourmis en sciences de la Vie
- Voyage dans le système solaire au Planétarium.
➡️ billetterie-etincelles.palais-decouverte.fr
January 16, 2026 at 8:01 AM
Demain, pour la séance de 10h aux Étincelles du Palais (Paris 15e Balard) vous avez le choix :
- Les séismes en Géosciences
- Électrostatique en Physique
- Le monde des fourmis en sciences de la Vie
- Voyage dans le système solaire au Planétarium.
➡️ billetterie-etincelles.palais-decouverte.fr
- Les séismes en Géosciences
- Électrostatique en Physique
- Le monde des fourmis en sciences de la Vie
- Voyage dans le système solaire au Planétarium.
➡️ billetterie-etincelles.palais-decouverte.fr
Reposted by Tim Demko
The internal crest anatomy of Lambeosaurini (Hadrosauridae: Lambeosaurinae) - Dudgeon - The Anatomical Record - Wiley Online Library anatomypubs.onlinelibrary.wiley.com/doi/10.1002/...
The internal crest anatomy of Lambeosaurini (Hadrosauridae: Lambeosaurinae)
The supracranial crests of lambeosaurine hadrosaurids have long been a focus of study due primarily to their extreme morphology. The external anatomy of lambeosaurine crests is understood to be highl...
anatomypubs.onlinelibrary.wiley.com
January 16, 2026 at 5:44 PM
The internal crest anatomy of Lambeosaurini (Hadrosauridae: Lambeosaurinae) - Dudgeon - The Anatomical Record - Wiley Online Library anatomypubs.onlinelibrary.wiley.com/doi/10.1002/...
Reposted by Tim Demko
This is why @simonwills.bsky.social and I prefer doing fieldwork in deserts. Still, a fun, if fossil-poor, day in Somkejacks Pit. My haul comprises a single partial croc tooth...
January 16, 2026 at 5:49 PM
This is why @simonwills.bsky.social and I prefer doing fieldwork in deserts. Still, a fun, if fossil-poor, day in Somkejacks Pit. My haul comprises a single partial croc tooth...
Reposted by Tim Demko
Reposted by Tim Demko
New paper alert! "Lithospheric models supported by the Caribbean and Levant examples help rethink transpression at plate boundaries" led by Anthony Jourdon,
@laetitialp.bsky.social, Dave May, Manuel Pubellier, open access in Nature Comms:
www.nature.com/articles/s41...
@natureportfolio.nature.com
@laetitialp.bsky.social, Dave May, Manuel Pubellier, open access in Nature Comms:
www.nature.com/articles/s41...
@natureportfolio.nature.com
January 14, 2026 at 6:52 PM
New paper alert! "Lithospheric models supported by the Caribbean and Levant examples help rethink transpression at plate boundaries" led by Anthony Jourdon,
@laetitialp.bsky.social, Dave May, Manuel Pubellier, open access in Nature Comms:
www.nature.com/articles/s41...
@natureportfolio.nature.com
@laetitialp.bsky.social, Dave May, Manuel Pubellier, open access in Nature Comms:
www.nature.com/articles/s41...
@natureportfolio.nature.com
Reposted by Tim Demko
Zircon crystals are nearly indestructible, and are some of the only things to survive the hellish pressure and heat of the Haldean Eon, when the earth was formed. The oldest zircons are found in Jack Hills, Australia, where our specimen was found. It may be small, but it's 4.4 billion years old!
January 14, 2026 at 7:59 PM
Zircon crystals are nearly indestructible, and are some of the only things to survive the hellish pressure and heat of the Haldean Eon, when the earth was formed. The oldest zircons are found in Jack Hills, Australia, where our specimen was found. It may be small, but it's 4.4 billion years old!
Reposted by Tim Demko
This is nice! A new surface dating tool using cosmogenic crypton in zircons. What's not to love!? 🌌💥🪨🏞️
A 'cosmic clock' in tiny crystals reveals the rise and fall of Australia's ancient landscapes
Australia's iconic red landscapes have been home to Aboriginal culture and recorded in songlines for tens of thousands of years. But further clues to just how ancient this landscape is come from far b...
phys.org
January 14, 2026 at 7:55 PM
This is nice! A new surface dating tool using cosmogenic crypton in zircons. What's not to love!? 🌌💥🪨🏞️
Reposted by Tim Demko
Like 56% of Earth's volume is just largely a mass of nearly black bridgmanite and dark but iridescent ferropericlase.
A bit more than 5% is a mix of darkest purple majorite garnet and deep blue ringwoodite.
A little over 4% is a mix of dark purple majorite garnet and blue green wadsleyite.
A bit more than 5% is a mix of darkest purple majorite garnet and deep blue ringwoodite.
A little over 4% is a mix of dark purple majorite garnet and blue green wadsleyite.
January 14, 2026 at 8:39 AM
Like 56% of Earth's volume is just largely a mass of nearly black bridgmanite and dark but iridescent ferropericlase.
A bit more than 5% is a mix of darkest purple majorite garnet and deep blue ringwoodite.
A little over 4% is a mix of dark purple majorite garnet and blue green wadsleyite.
A bit more than 5% is a mix of darkest purple majorite garnet and deep blue ringwoodite.
A little over 4% is a mix of dark purple majorite garnet and blue green wadsleyite.
Reposted by Tim Demko
Thank you, Sólveig M. Guðjónsdóttir, @jcchacond.bsky.social & Dr Kamilla Pawłowska for speaking w/me about woolly rhino DNA from a mummified wolf pup! Thank you, @andreatweather.bsky.social, for improving the story!
www.scientificamerican.com/article/scie...
www.scientificamerican.com/article/scie...
Scientists Find Extinct Rhino DNA in Mummified Wolf Puppy's Stomach
Scientists have sequenced the genome of the long-extinct woolly rhinoceros from remains found in the stomach of a naturally mummified Pleistocene wolf pup
www.scientificamerican.com
January 14, 2026 at 5:56 PM
Thank you, Sólveig M. Guðjónsdóttir, @jcchacond.bsky.social & Dr Kamilla Pawłowska for speaking w/me about woolly rhino DNA from a mummified wolf pup! Thank you, @andreatweather.bsky.social, for improving the story!
www.scientificamerican.com/article/scie...
www.scientificamerican.com/article/scie...
Reposted by Tim Demko
Do you know that Tektonika #DOAJ publishes Field Guide papers?
Such papers are "concise accounts of key localities within geological areas of interest, providing insights into key structural geology and #tectonic concepts."
Don't hesitate to send us manuscripts or consult our editors!
1/2
Such papers are "concise accounts of key localities within geological areas of interest, providing insights into key structural geology and #tectonic concepts."
Don't hesitate to send us manuscripts or consult our editors!
1/2
January 14, 2026 at 11:20 AM
Reposted by Tim Demko
New open-source QGIS tools for building realistic 3D, non-planar fault surfaces from geologic & geophysical data. Three interoperable plugins provide a full workflow from interpretation to interactive 3D visualization—no proprietary software.
Learn more:
https://cascadiaquakes.org/cfm/
Learn more:
https://cascadiaquakes.org/cfm/
January 13, 2026 at 7:16 PM
New open-source QGIS tools for building realistic 3D, non-planar fault surfaces from geologic & geophysical data. Three interoperable plugins provide a full workflow from interpretation to interactive 3D visualization—no proprietary software.
Learn more:
https://cascadiaquakes.org/cfm/
Learn more:
https://cascadiaquakes.org/cfm/
Reposted by Tim Demko
New remains of the armored dinosaur Patagopelta cristata Riguetti et al. 2022 (Ornithischia, Parankylosauria) from the Late Cretaceous of Patagonia, Argentina: Historical Biology: Vol 0, No 0 - Get Access www.tandfonline.com/doi/full/10....
New remains of the armored dinosaur Patagopelta cristata Riguetti et al. 2022 (Ornithischia, Parankylosauria) from the Late Cretaceous of Patagonia, Argentina
The fossil record of Southern Hemisphere thyreophorans has expanded significantly in recent years. Among notable discoveries is the armoured dinosaur Patagopelta cristata, from Maastrichtian beds i...
www.tandfonline.com
January 14, 2026 at 2:27 PM
New remains of the armored dinosaur Patagopelta cristata Riguetti et al. 2022 (Ornithischia, Parankylosauria) from the Late Cretaceous of Patagonia, Argentina: Historical Biology: Vol 0, No 0 - Get Access www.tandfonline.com/doi/full/10....