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
Palaeoplatyceros hispanicus- a muntjac-like deer from the Middle Miocene of Spain. Numerous antlers found on Otero Hill in Palencia allow to trace the age-related dimorphism of these animals. The illustration shows an adult, possibly even old, animal and a younger deer in the background.
November 8, 2025 at 10:55 PM
Palaeoplatyceros hispanicus- a muntjac-like deer from the Middle Miocene of Spain. Numerous antlers found on Otero Hill in Palencia allow to trace the age-related dimorphism of these animals. The illustration shows an adult, possibly even old, animal and a younger deer in the background.
Reposted by Tim Demko
T. Calderón, A. Cuccu, J. Morales, B. Azanza & D. DeMiguel (2026)
Quantitative histological analysis of dental variability in Anchitherium: insights into growth dynamics and dental development
Palaeogeography, Palaeoclimatology, Palaeoecology 113557
www.sciencedirect.com/science/arti...
Quantitative histological analysis of dental variability in Anchitherium: insights into growth dynamics and dental development
Palaeogeography, Palaeoclimatology, Palaeoecology 113557
www.sciencedirect.com/science/arti...
Redirecting
doi.org
January 18, 2026 at 2:28 PM
T. Calderón, A. Cuccu, J. Morales, B. Azanza & D. DeMiguel (2026)
Quantitative histological analysis of dental variability in Anchitherium: insights into growth dynamics and dental development
Palaeogeography, Palaeoclimatology, Palaeoecology 113557
www.sciencedirect.com/science/arti...
Quantitative histological analysis of dental variability in Anchitherium: insights into growth dynamics and dental development
Palaeogeography, Palaeoclimatology, Palaeoecology 113557
www.sciencedirect.com/science/arti...
Reposted by Tim Demko
Another "thinnie for fun".
Lizardite crystals from the 'Monte Fico lizardite', a material that is used by experimentalists, kindly donated by prof. Cecilia Viti
⚒️ #geology #serpentine #minerals
Lizardite crystals from the 'Monte Fico lizardite', a material that is used by experimentalists, kindly donated by prof. Cecilia Viti
⚒️ #geology #serpentine #minerals
January 18, 2026 at 4:14 PM
Another "thinnie for fun".
Lizardite crystals from the 'Monte Fico lizardite', a material that is used by experimentalists, kindly donated by prof. Cecilia Viti
⚒️ #geology #serpentine #minerals
Lizardite crystals from the 'Monte Fico lizardite', a material that is used by experimentalists, kindly donated by prof. Cecilia Viti
⚒️ #geology #serpentine #minerals
Reposted by Tim Demko
Herrera, Y. et al. 2026. A complete morphological description of Dakosaurus maximus (Crocodyliformes: Thalattosuchia) with further insights into their palaeoecology. Palaeontologia Electronica, 29(1):a4.
doi.org/10.26879/157...
doi.org/10.26879/157...
doi.org
January 18, 2026 at 1:15 PM
Herrera, Y. et al. 2026. A complete morphological description of Dakosaurus maximus (Crocodyliformes: Thalattosuchia) with further insights into their palaeoecology. Palaeontologia Electronica, 29(1):a4.
doi.org/10.26879/157...
doi.org/10.26879/157...
Reposted by Tim Demko
Oreodonts are extinct mammals that looked similar to pigs and sheep, but were more closely related to camels. They are the most commonly found fossil in the White River Badlands in South Dakota, and this exceptional specimen from our collection shows an oreodont curled up inside its burrow.
January 18, 2026 at 7:59 PM
Oreodonts are extinct mammals that looked similar to pigs and sheep, but were more closely related to camels. They are the most commonly found fossil in the White River Badlands in South Dakota, and this exceptional specimen from our collection shows an oreodont curled up inside its burrow.
Reposted by Tim Demko
A thinnie I made for fun. Yes, I now have this expensive bad habit.
#peridotite xenoliths in ocean island basalt #OIB from Canary Islands, Spain
#geology ⚒️
#peridotite xenoliths in ocean island basalt #OIB from Canary Islands, Spain
#geology ⚒️
January 18, 2026 at 7:50 AM
A thinnie I made for fun. Yes, I now have this expensive bad habit.
#peridotite xenoliths in ocean island basalt #OIB from Canary Islands, Spain
#geology ⚒️
#peridotite xenoliths in ocean island basalt #OIB from Canary Islands, Spain
#geology ⚒️
Reposted by Tim Demko
Michael Chiappone, Michele Guala, Raymond Rogers, Peter Makovicky (2026)
When the levee breaks: experimentally testing dinosaur and mammal bone transport in unsteady flows
Paleobiology (advance online publication)
DOI: doi.org/10.1017/pab....
www.cambridge.org/core/journal...
When the levee breaks: experimentally testing dinosaur and mammal bone transport in unsteady flows
Paleobiology (advance online publication)
DOI: doi.org/10.1017/pab....
www.cambridge.org/core/journal...
When the levee breaks: experimentally testing dinosaur and mammal bone transport in unsteady flows | Paleobiology | Cambridge Core
When the levee breaks: experimentally testing dinosaur and mammal bone transport in unsteady flows
doi.org
January 18, 2026 at 2:38 PM
Michael Chiappone, Michele Guala, Raymond Rogers, Peter Makovicky (2026)
When the levee breaks: experimentally testing dinosaur and mammal bone transport in unsteady flows
Paleobiology (advance online publication)
DOI: doi.org/10.1017/pab....
www.cambridge.org/core/journal...
When the levee breaks: experimentally testing dinosaur and mammal bone transport in unsteady flows
Paleobiology (advance online publication)
DOI: doi.org/10.1017/pab....
www.cambridge.org/core/journal...
Reposted by Tim Demko
Can we work with Prehistoric Museum and Museum of the San Rafael to develop some serious exhibits on the Cretaceous Marine Ecosystems of the Mancos Group around the San Rafael Swell? Public collecting area in Juana Lopez like U Dig It? @utahpaleo-ufop.bsky.social @jeremybroberts.bsky.social
January 18, 2026 at 7:39 PM
Can we work with Prehistoric Museum and Museum of the San Rafael to develop some serious exhibits on the Cretaceous Marine Ecosystems of the Mancos Group around the San Rafael Swell? Public collecting area in Juana Lopez like U Dig It? @utahpaleo-ufop.bsky.social @jeremybroberts.bsky.social
Reposted by Tim Demko
In a new #BSSA paper, scientists present a new vertical ground-motion prediction equation for southwest China. ⚒️
buff.ly/6X3fa3a
buff.ly/6X3fa3a
January 18, 2026 at 9:01 PM
In a new #BSSA paper, scientists present a new vertical ground-motion prediction equation for southwest China. ⚒️
buff.ly/6X3fa3a
buff.ly/6X3fa3a
Reposted by Tim Demko
New paper just dropped finally describing a complete specimen of Dakosaurus maximus and what a beauty it is. Some highlights, in addition to this being a long time coming, is the presence of bitemarks on the face and chondrichthyan material in the stomach
doi.org/10.26879/1577
doi.org/10.26879/1577
January 18, 2026 at 11:09 AM
New paper just dropped finally describing a complete specimen of Dakosaurus maximus and what a beauty it is. Some highlights, in addition to this being a long time coming, is the presence of bitemarks on the face and chondrichthyan material in the stomach
doi.org/10.26879/1577
doi.org/10.26879/1577
Reposted by Tim Demko
🌟OPEN ACCESS🌟In a new #TSR paper, scientists explore deep mantle earthquakes in Wyoming. In particular, they consider the question of how earthquakes occur in rocks that should be deforming in a ductile fashion — not breaking. ⚒️
buff.ly/N49GZJZ
buff.ly/N49GZJZ
January 18, 2026 at 10:00 PM
🌟OPEN ACCESS🌟In a new #TSR paper, scientists explore deep mantle earthquakes in Wyoming. In particular, they consider the question of how earthquakes occur in rocks that should be deforming in a ductile fashion — not breaking. ⚒️
buff.ly/N49GZJZ
buff.ly/N49GZJZ
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.”
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...