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
Found trace fossils in sandstone along the California coast. To me (nonexpert), it looks like wave ripple marks with mud-filled worm burrows.
November 28, 2025 at 1:24 AM
Found trace fossils in sandstone along the California coast. To me (nonexpert), it looks like wave ripple marks with mud-filled worm burrows.
Reposted by Tim Demko
Ashfall Fossil Beds is an astonishing locality of which I was ignorant until last week. Included it in Monday’s Introduction to Volcanoes lecture to @durhamearthsci.bsky.social first years. 🧪🌋⚒️
12 million year old bone-crushing dog tracks!
New article on research we presented at the recent Vert Paleo conference in the UK.
Lots of on-going work at Ashfall Fossil Beds @unsmmorrillhall.bsky.social
Happy Thanksgiving for those in the states. 🦃
www.livescience.com/animals/exti...
New article on research we presented at the recent Vert Paleo conference in the UK.
Lots of on-going work at Ashfall Fossil Beds @unsmmorrillhall.bsky.social
Happy Thanksgiving for those in the states. 🦃
www.livescience.com/animals/exti...
Large, bone-crushing dogs stalked 'Rhino Pompeii' after Yellowstone eruption 12 million years ago, ancient footprints reveal
Researchers have found footprints of large, bone-crushing dogs in the 12 million-year-old Ashfall Fossil Beds in northeastern Nebraska, suggesting these large carnivores may have survived a cataclysmi...
www.livescience.com
November 27, 2025 at 9:19 PM
Ashfall Fossil Beds is an astonishing locality of which I was ignorant until last week. Included it in Monday’s Introduction to Volcanoes lecture to @durhamearthsci.bsky.social first years. 🧪🌋⚒️
Reposted by Tim Demko
Nebraska: The Land of Unique Cenozoic Fossil Beds That If The State Government Was Competent Would Be Major International Tourist Draws.
Ashfall Fossil Beds is an astonishing locality of which I was ignorant until last week. Included it in Monday’s Introduction to Volcanoes lecture to @durhamearthsci.bsky.social first years. 🧪🌋⚒️
12 million year old bone-crushing dog tracks!
New article on research we presented at the recent Vert Paleo conference in the UK.
Lots of on-going work at Ashfall Fossil Beds @unsmmorrillhall.bsky.social
Happy Thanksgiving for those in the states. 🦃
www.livescience.com/animals/exti...
New article on research we presented at the recent Vert Paleo conference in the UK.
Lots of on-going work at Ashfall Fossil Beds @unsmmorrillhall.bsky.social
Happy Thanksgiving for those in the states. 🦃
www.livescience.com/animals/exti...
November 28, 2025 at 12:36 AM
Nebraska: The Land of Unique Cenozoic Fossil Beds That If The State Government Was Competent Would Be Major International Tourist Draws.
Introduce yourself with five concerts you've seen:
Talking Heads
Weather Report
Tom Waits
B-52s
Rod Stewart
Talking Heads
Weather Report
Tom Waits
B-52s
Rod Stewart
Introduce yourself with five concerts you've seen:
Rolling Stones - Voodoo Lounge (1993)
U2 - Pop Mart (1997)
Page & Plant (Albany, NY?) (1998)
LCD Soundsystem - Final Show at MSG (2011)
LCD Soundsystem - Reunited at Webster Hall (We Have Expenses, Sponsored by Bored Ape Yacht Club and AmEx) (2016)
Rolling Stones - Voodoo Lounge (1993)
U2 - Pop Mart (1997)
Page & Plant (Albany, NY?) (1998)
LCD Soundsystem - Final Show at MSG (2011)
LCD Soundsystem - Reunited at Webster Hall (We Have Expenses, Sponsored by Bored Ape Yacht Club and AmEx) (2016)
Introduce yourself with five concerts you've seen:
Weird Al 2000 (and multiple after)
Linkin Park Meteora Tour 2004
Dear Friends – Music from Final Fantasy 2005 (and multiple after)
Polysics 2010
The Earthbound Papas 2011 (and multiple after)
Weird Al 2000 (and multiple after)
Linkin Park Meteora Tour 2004
Dear Friends – Music from Final Fantasy 2005 (and multiple after)
Polysics 2010
The Earthbound Papas 2011 (and multiple after)
November 28, 2025 at 12:44 AM
Introduce yourself with five concerts you've seen:
Talking Heads
Weather Report
Tom Waits
B-52s
Rod Stewart
Talking Heads
Weather Report
Tom Waits
B-52s
Rod Stewart
Reposted by Tim Demko
Awesome new work published in @science.org's Science Advances led by Addison Tu that brings together landscape evolution modelling and machine learning predictions to estimate the preservation of porphry copper deposits. Out now!
Open Access link: www.science.org/doi/10.1126/...
Open Access link: www.science.org/doi/10.1126/...
November 28, 2025 at 12:22 AM
Awesome new work published in @science.org's Science Advances led by Addison Tu that brings together landscape evolution modelling and machine learning predictions to estimate the preservation of porphry copper deposits. Out now!
Open Access link: www.science.org/doi/10.1126/...
Open Access link: www.science.org/doi/10.1126/...
Reposted by Tim Demko
The GIFT #workshop for #EGU26 is now open for registration!
Whether you're a primary or secondary school #teacher looking to gain first-hand scientific insights, this is your chance to take part in this exciting workshop at #EGU26.
📆: 28 November 2025.
👉: egu.eu/9GCSKA
📷: Stefan Schmitt on #imaggeo
Whether you're a primary or secondary school #teacher looking to gain first-hand scientific insights, this is your chance to take part in this exciting workshop at #EGU26.
📆: 28 November 2025.
👉: egu.eu/9GCSKA
📷: Stefan Schmitt on #imaggeo
November 27, 2025 at 11:23 AM
Reposted by Tim Demko
University of Oslo is hiring:
Postdoctoral Research Fellow in Physical Oceanography available at Department of Geosciences
Postdoctoral Research Fellow in Physical Oceanography available at Department of Geosciences
November 27, 2025 at 12:59 PM
University of Oslo is hiring:
Postdoctoral Research Fellow in Physical Oceanography available at Department of Geosciences
Postdoctoral Research Fellow in Physical Oceanography available at Department of Geosciences
Reposted by Tim Demko
Go my Bothriolepis... This year's fish pecan pie! Bothriolepis was a peculiar-looking placoderm from the Devonian period or the Paleozoic. It had two long pointed pectoral fins and silly little eyes on top of its head.
#fossil #fish #paleontology #bothriolepis
#fossil #fish #paleontology #bothriolepis
November 27, 2025 at 10:16 PM
Go my Bothriolepis... This year's fish pecan pie! Bothriolepis was a peculiar-looking placoderm from the Devonian period or the Paleozoic. It had two long pointed pectoral fins and silly little eyes on top of its head.
#fossil #fish #paleontology #bothriolepis
#fossil #fish #paleontology #bothriolepis
Reposted by Tim Demko
More info on the M6.0 earthquake NW of Anchorage
earthquake.alaska.edu/event/ak2025...
FB page
www.facebook.com/Akearthquake
AEC is requesting anyone with video footage or photos from this earthquake to send them to:
[email protected]
(or message through FaceBook)
🧪⚒️
#earthquake
#alaska
earthquake.alaska.edu/event/ak2025...
FB page
www.facebook.com/Akearthquake
AEC is requesting anyone with video footage or photos from this earthquake to send them to:
[email protected]
(or message through FaceBook)
🧪⚒️
#earthquake
#alaska
Willow M6.0 | Alaska Earthquake Center
Alaskan Earthquake Center
earthquake.alaska.edu
November 27, 2025 at 10:45 PM
More info on the M6.0 earthquake NW of Anchorage
earthquake.alaska.edu/event/ak2025...
FB page
www.facebook.com/Akearthquake
AEC is requesting anyone with video footage or photos from this earthquake to send them to:
[email protected]
(or message through FaceBook)
🧪⚒️
#earthquake
#alaska
earthquake.alaska.edu/event/ak2025...
FB page
www.facebook.com/Akearthquake
AEC is requesting anyone with video footage or photos from this earthquake to send them to:
[email protected]
(or message through FaceBook)
🧪⚒️
#earthquake
#alaska
Reposted by Tim Demko
Novel scientific method proves pit circle near Stonehenge was man-made, say researchers
Archaeologists use multiple types of geophysics equipment to analyse ‘extraordinary structure’
Steven Morris
www.theguardian.com/science/2025...
Archaeologists use multiple types of geophysics equipment to analyse ‘extraordinary structure’
Steven Morris
www.theguardian.com/science/2025...
Novel scientific method proves pit circle near Stonehenge was man-made, say researchers
Archaeologists use multiple types of geophysics equipment to analyse ‘extraordinary structure’
www.theguardian.com
November 27, 2025 at 2:50 PM
Novel scientific method proves pit circle near Stonehenge was man-made, say researchers
Archaeologists use multiple types of geophysics equipment to analyse ‘extraordinary structure’
Steven Morris
www.theguardian.com/science/2025...
Archaeologists use multiple types of geophysics equipment to analyse ‘extraordinary structure’
Steven Morris
www.theguardian.com/science/2025...
Reposted by Tim Demko
Twinned crystals of andalusite (chiastolite) are shown below. Chiastolite is a variety of andalusite that contains black particles of graphite arranged in geometric patterns. More at the comment.
⚒️ sci-fi 🧪 🖖🏼 scifi Geosciences #WomenInSTEM geology 🍎 🔭🪐
⚒️ sci-fi 🧪 🖖🏼 scifi Geosciences #WomenInSTEM geology 🍎 🔭🪐
331 of #365Minerals 🧪⚒️
Andalusite:
- An aluminosilicate mineral
- A polymorph of kyanite and sillimanite
- A common low grade metamorphic mineral
- Used in the production of high temperature ceramics
- Named after Andalusia in Spain #minerals
Andalusite:
- An aluminosilicate mineral
- A polymorph of kyanite and sillimanite
- A common low grade metamorphic mineral
- Used in the production of high temperature ceramics
- Named after Andalusia in Spain #minerals
November 27, 2025 at 9:43 PM
Twinned crystals of andalusite (chiastolite) are shown below. Chiastolite is a variety of andalusite that contains black particles of graphite arranged in geometric patterns. More at the comment.
⚒️ sci-fi 🧪 🖖🏼 scifi Geosciences #WomenInSTEM geology 🍎 🔭🪐
⚒️ sci-fi 🧪 🖖🏼 scifi Geosciences #WomenInSTEM geology 🍎 🔭🪐
Reposted by Tim Demko
We love this incredible fact, but it also leads to the realisation that the first dinosaurs emerged in a completely different spiral arm of the galaxy!
Let's try and work this out. Astro-professionals, please shout if we get any of this wrong..
1/
Let's try and work this out. Astro-professionals, please shout if we get any of this wrong..
1/
It's Friday, and apparently bluesky is ready for this fun revelation:
Dinosaurs lived on the other side the Galaxy.
Dinosaurs lived on the other side the Galaxy.
November 27, 2025 at 8:00 PM
We love this incredible fact, but it also leads to the realisation that the first dinosaurs emerged in a completely different spiral arm of the galaxy!
Let's try and work this out. Astro-professionals, please shout if we get any of this wrong..
1/
Let's try and work this out. Astro-professionals, please shout if we get any of this wrong..
1/
Reposted by Tim Demko
Dinosaurs were nearly wiped out 66 million years ago, long before the start of the Quaternary ice age. However, #PrehistoricPlanetIceAge shows that the few surviving dinosaurs (birds) would go on to become highly successful. Let's meet the ice age dinosaurs featured in the series! 🪶🧪
November 27, 2025 at 4:09 PM
Dinosaurs were nearly wiped out 66 million years ago, long before the start of the Quaternary ice age. However, #PrehistoricPlanetIceAge shows that the few surviving dinosaurs (birds) would go on to become highly successful. Let's meet the ice age dinosaurs featured in the series! 🪶🧪
Reposted by Tim Demko
Thin Section Thursday!
Ophitic texture of plagioclase laths encased in clinopyroxene in a gabbro from the Glen Mtns. Layered Complex in southwestern Oklahoma. Contributed by Robert Puckett. You can contribute too! Send images to akoziol1 at udayton dot edu. #thinsectionthursday
Ophitic texture of plagioclase laths encased in clinopyroxene in a gabbro from the Glen Mtns. Layered Complex in southwestern Oklahoma. Contributed by Robert Puckett. You can contribute too! Send images to akoziol1 at udayton dot edu. #thinsectionthursday
November 27, 2025 at 1:32 PM
Thin Section Thursday!
Ophitic texture of plagioclase laths encased in clinopyroxene in a gabbro from the Glen Mtns. Layered Complex in southwestern Oklahoma. Contributed by Robert Puckett. You can contribute too! Send images to akoziol1 at udayton dot edu. #thinsectionthursday
Ophitic texture of plagioclase laths encased in clinopyroxene in a gabbro from the Glen Mtns. Layered Complex in southwestern Oklahoma. Contributed by Robert Puckett. You can contribute too! Send images to akoziol1 at udayton dot edu. #thinsectionthursday
Reposted by Tim Demko
Monitoring crustal deformation: sometimes in the lithosphere, sometimes on your pie plate.
🍁🍂 Happy Thanksgiving from EarthScope!
🍁🍂 Happy Thanksgiving from EarthScope!
November 27, 2025 at 2:25 PM
Monitoring crustal deformation: sometimes in the lithosphere, sometimes on your pie plate.
🍁🍂 Happy Thanksgiving from EarthScope!
🍁🍂 Happy Thanksgiving from EarthScope!
Reposted by Tim Demko
I spoke to my deep passion of bogs and peatlands in this TEDx talk. Will you join me in becoming a bog champion? m.youtube.com/watch?v=mWt9...
Bogs are real superheroes, cast as villains | Dr. Merritt Turetsky | TEDxBoulder
YouTube video by TEDx Talks
m.youtube.com
November 26, 2025 at 8:27 PM
I spoke to my deep passion of bogs and peatlands in this TEDx talk. Will you join me in becoming a bog champion? m.youtube.com/watch?v=mWt9...
Reposted by Tim Demko
An Anthropologist's perspecive on Prehistoric Planet: Ice Age after finishing it:
Excluding humans is rewriting the Ice Age as a "Pristine world free of humans." This is damaging and simply incorrect. There are millennia of Indigenous interactions between humans and other species all erased here.
Excluding humans is rewriting the Ice Age as a "Pristine world free of humans." This is damaging and simply incorrect. There are millennia of Indigenous interactions between humans and other species all erased here.
November 26, 2025 at 9:17 PM
An Anthropologist's perspecive on Prehistoric Planet: Ice Age after finishing it:
Excluding humans is rewriting the Ice Age as a "Pristine world free of humans." This is damaging and simply incorrect. There are millennia of Indigenous interactions between humans and other species all erased here.
Excluding humans is rewriting the Ice Age as a "Pristine world free of humans." This is damaging and simply incorrect. There are millennia of Indigenous interactions between humans and other species all erased here.
Reposted by Tim Demko
youtu.be/tjtQvWtEqXg
Este vídeo faz parte de um projeto de extensão realizado com alunos e professores do IFPB, de Sousa. A iniciativa é do DInO-Lab-UFRN, com financiamento da Pró-reitoria de Extensão (PROEX) da UFRN.
Assista aqui: www.youtube.com/watch?v=tjtQ...
Este vídeo faz parte de um projeto de extensão realizado com alunos e professores do IFPB, de Sousa. A iniciativa é do DInO-Lab-UFRN, com financiamento da Pró-reitoria de Extensão (PROEX) da UFRN.
Assista aqui: www.youtube.com/watch?v=tjtQ...
Qual o maior e qual o menor dinossauro? | Respondendo as perguntas de vocês #04
YouTube video by PaleoBlog BR
youtu.be
November 26, 2025 at 11:25 PM
youtu.be/tjtQvWtEqXg
Este vídeo faz parte de um projeto de extensão realizado com alunos e professores do IFPB, de Sousa. A iniciativa é do DInO-Lab-UFRN, com financiamento da Pró-reitoria de Extensão (PROEX) da UFRN.
Assista aqui: www.youtube.com/watch?v=tjtQ...
Este vídeo faz parte de um projeto de extensão realizado com alunos e professores do IFPB, de Sousa. A iniciativa é do DInO-Lab-UFRN, com financiamento da Pró-reitoria de Extensão (PROEX) da UFRN.
Assista aqui: www.youtube.com/watch?v=tjtQ...
Reposted by Tim Demko
Applications for Participation in IODP3 Expedition 505S are now open!
Deadline January 23rd 2026 - lnkd.in/etiWvk2z
If you are a researcher/science communicator interested in contributing to understanding an enigma in the early Miocene Earth system then please consider applying this expedition!
Deadline January 23rd 2026 - lnkd.in/etiWvk2z
If you are a researcher/science communicator interested in contributing to understanding an enigma in the early Miocene Earth system then please consider applying this expedition!
November 26, 2025 at 4:54 PM
Applications for Participation in IODP3 Expedition 505S are now open!
Deadline January 23rd 2026 - lnkd.in/etiWvk2z
If you are a researcher/science communicator interested in contributing to understanding an enigma in the early Miocene Earth system then please consider applying this expedition!
Deadline January 23rd 2026 - lnkd.in/etiWvk2z
If you are a researcher/science communicator interested in contributing to understanding an enigma in the early Miocene Earth system then please consider applying this expedition!
Reposted by Tim Demko
If you are interested in the Early Miocene, this is a great opportunity. There is an upcoming Webinar on 4 Dec on the project. Check it out and consider trying out for the expedition. ⚒️
plymouth.zoom.us/webinar/regi...
plymouth.zoom.us/webinar/regi...
November 26, 2025 at 7:41 PM
If you are interested in the Early Miocene, this is a great opportunity. There is an upcoming Webinar on 4 Dec on the project. Check it out and consider trying out for the expedition. ⚒️
plymouth.zoom.us/webinar/regi...
plymouth.zoom.us/webinar/regi...
Reposted by Tim Demko
Mars - Blackcraig Butte - Gale Crater - 150 MP - Nasa's Curiosity SOL 3386 - From Andrea Luck (andrealuck.bsky.social) - https://flic.kr/p/2n41EcP
November 26, 2025 at 11:00 PM
Mars - Blackcraig Butte - Gale Crater - 150 MP - Nasa's Curiosity SOL 3386 - From Andrea Luck (andrealuck.bsky.social) - https://flic.kr/p/2n41EcP
Reposted by Tim Demko
Great example of the value of multi-method studies, in this case integrating drone-based imagery with seismic data. 🌋 🧪 ⚒️
EarthScope Consortium (@earthscope.org)
Comparing seismic data and drone imagery from the 2021 eruption at Geldingadalir in Iceland shows that ground tremor spikes track bursts of bubble-bursting and lava spatter, not the lake’s rising or…
bsky.app
November 26, 2025 at 8:00 PM
Great example of the value of multi-method studies, in this case integrating drone-based imagery with seismic data. 🌋 🧪 ⚒️
Reposted by Tim Demko
In a new #SRL paper, scientists develop a deep learning method that simultaneously obtains shear-wave velocity structure, sedimentary layer thickness, and Moho depth ⚒️
pubs.geoscienceworld.org/ssa/srl/arti...
pubs.geoscienceworld.org/ssa/srl/arti...
November 26, 2025 at 8:02 PM
In a new #SRL paper, scientists develop a deep learning method that simultaneously obtains shear-wave velocity structure, sedimentary layer thickness, and Moho depth ⚒️
pubs.geoscienceworld.org/ssa/srl/arti...
pubs.geoscienceworld.org/ssa/srl/arti...
Reposted by Tim Demko
Really not liking Prehistoric Planet Ice Age's *heavy* emphasis on the Isthmus of Panama appearing only in the last 3 million years.
Cutting edge of 1990s geology going on there totally ignoring what geologists in Panama and Colombia have learned.
Cutting edge of 1990s geology going on there totally ignoring what geologists in Panama and Colombia have learned.
November 26, 2025 at 7:28 PM
Really not liking Prehistoric Planet Ice Age's *heavy* emphasis on the Isthmus of Panama appearing only in the last 3 million years.
Cutting edge of 1990s geology going on there totally ignoring what geologists in Panama and Colombia have learned.
Cutting edge of 1990s geology going on there totally ignoring what geologists in Panama and Colombia have learned.
Reposted by Tim Demko
🌟OPEN ACCESS🌟To quickly and correctly assess moment magnitude is to provide important information to emergency responders. However, doing this in less than ten minutes after an earthquake begins is tough. A new #BSSA paper explores how to speed things up. ⚒️
pubs.geoscienceworld.org/ssa/bssa/art...
pubs.geoscienceworld.org/ssa/bssa/art...
November 26, 2025 at 9:01 PM
🌟OPEN ACCESS🌟To quickly and correctly assess moment magnitude is to provide important information to emergency responders. However, doing this in less than ten minutes after an earthquake begins is tough. A new #BSSA paper explores how to speed things up. ⚒️
pubs.geoscienceworld.org/ssa/bssa/art...
pubs.geoscienceworld.org/ssa/bssa/art...