Tim Demko
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Tim Demko
@timdemko.xyz
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
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. 🧪🌋⚒️
November 27, 2025 at 9:19 PM
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...
November 28, 2025 at 12:36 AM
Introduce yourself with five concerts you've seen:

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)
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)
November 28, 2025 at 12:44 AM
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/...
November 28, 2025 at 12:22 AM
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
November 27, 2025 at 11:23 AM
Reposted by Tim Demko
November 27, 2025 at 12:59 PM
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
November 27, 2025 at 10:16 PM
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
Willow M6.0 | Alaska Earthquake Center
Alaskan Earthquake Center
earthquake.alaska.edu
November 27, 2025 at 10:45 PM
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...
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
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 🍎 🔭🪐
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
November 27, 2025 at 9:43 PM
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/
It's Friday, and apparently bluesky is ready for this fun revelation:

Dinosaurs lived on the other side the Galaxy.
November 27, 2025 at 8:00 PM
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
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
November 27, 2025 at 1:32 PM
Reposted by Tim Demko
Monitoring crustal deformation: sometimes in the lithosphere, sometimes on your pie plate.

🍁🍂 Happy Thanksgiving from EarthScope!
November 27, 2025 at 2:25 PM
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
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.
November 26, 2025 at 9:17 PM
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...
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
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!
November 26, 2025 at 4:54 PM
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...
November 26, 2025 at 7:41 PM
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
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
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...
November 26, 2025 at 8:02 PM
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.
November 26, 2025 at 7:28 PM
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...
November 26, 2025 at 9:01 PM