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Duane Froese

@tephrafan.bsky.social
294 followers 184 following 43 posts

naturalist | professor | ualberta | northern research | permafrost | Quat Geo | working with northern communities | PACS Lab | Rett Syndrome | he/him

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Duane Froese @tephrafan.bsky.social · 25/09/2026
Wrapping up fieldwork in the Sahtú. September means great fall colours and great landscapes of the central Mackenzie Valley #permafrost #ualberta #Sahtu, #NWT
View of Niffin Twe (Lake) south of Fort Good Hope. Tamarack and Aspen in full colourView of Bear Rock across the Great Bear River at Tulit’a. Mackenzie River (Deh Cho) south of the Ramparts near Fort Good Hope. View shows  river terrace and large river View of team member (Qingseng Du) with drill and extensions installing a ground temperature station in the valley.
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Duane Froese @tephrafan.bsky.social · 25/09/2026
Our new paper in GRL: "permafrost detachment slides." Entire frozen hillsides in NWT are failing from the base of permafrost creating the largest permafrost landslides in northern Canada. Thaw is driven by past wildfires and warming. Led by Joe Young. OA 👇 doi.org/10.1029/2026... #permafrost
doi.org
Permafrost Detachment Slides: A Distinct High‐Magnitude Permafrost Mass Wasting Process
PDSs fail through bottom-up thaw and detach the entire permafrost profile, fundamentally different from top-down thaw-driven mass wasting Climate warming and wildfire drive heat to the permafrost...
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Duane Froese @tephrafan.bsky.social · 12/07/2026
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Duane Froese @tephrafan.bsky.social · 10/07/2026
Permafrost is the most exceptional archive of natural history on Earth, and is increasingly at risk with climate change. We wrote a short piece in The Conversation making the case for why these archives matter, and why we need to preserve them in a warming world theconversation.com/earths-deep-...
theconversation.com
Earth’s deep memory is thawing with the Arctic permafrost, degrading records of our ancient world
Permafrost holds an extraordinary molecular record of ancient life — and we are only now learning to read it, just as warming begins to erase it.
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Duane Froese @tephrafan.bsky.social · 04/08/2025
Crazy ice wedge day. 10-12 m high syngenetic ice wedge spanning the Late Pleistocene—early Holocene boundary. #klondike #permasfrost
Photo of an ice rich permafrost exposure with thin aggrading (syngenetic) ice wedge.
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Duane Froese @tephrafan.bsky.social · 19/07/2025
Great new paper on long recurrence interval earthquakes along the Tintina Fault in central Yukon, led by @theronfinley.bsky.social. A nice merging of the rich glacial record of the Yukon with modern seismicity data to understand potential risk in northern Canada. Great work Theron!
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Theron Finley @theronfinley.bsky.social · 16/07/2025
Really pleased to share our new paper in GRL, documenting evidence of multiple Quaternary surface-rupturing earthquakes on the Tintina fault in the Yukon. doi.org/10.1029/2025... @faultydata.bsky.social @earthquakeguy.bsky.social @thatfaultguy.bsky.social @tephrafan.bsky.social
doi.org
Large Surface‐Rupturing Earthquakes and a >12 kyr, Open Interseismic Interval on the Tintina Fault, Yukon
We provide the first conclusive evidence of numerous large (>Mw 7.5) surface-rupturing earthquakes in the Quaternary on the Tintina fault Offsets to Early and Middle Pleistocene glaciofluvial ter...
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Duane Froese @tephrafan.bsky.social · 24/05/2025
New paper with a large cast, but including a lot of permafrost, preserved horse fossils from the Yukon— work we did collaboratively over many years. Nice to see this out. Paper led by indigenous authors, highlighting deep connections horses and communities. www.science.org/doi/10.1126/...
Image of the cover of the journal Science with two horses galloping across a meadow, highlighting the accompanying paper.
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Duane Froese @tephrafan.bsky.social · 28/04/2025
The Ukrainian Sherpa UTV all conditions buggy, including amphibious. A spring fieldwork dream…not ours just interloping on their ride with some frozen materials.
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Britta Jensen @tephrabird.bsky.social · 08/04/2025
Hi geoscientists! For those who avoid journals that are profit-focussed and abuse academic free labour (e.g., Elsevier, Nature), take a look at CJES. Non-profit and a storied history. I just joined as AE - journals like this are run with heart and integrity and need your support. #academicsky ⚒️🧪
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Duane Froese @tephrafan.bsky.social · 26/02/2025
New paper from Ben Stoker’s PhD with Martin Margold on the ice flow history of the NW Laurentide Ice Sheet. Not for the faint— clicking in at 41p. A huge effort to compile and organize into a consistent ice sheet history with contributions from many. tc.copernicus.org/articles/19/...
tc.copernicus.org
Ice flow dynamics of the northwestern Laurentide Ice Sheet during the last deglaciation
Abstract. Reconstructions of palaeo-ice-stream activity provide insight into the processes governing ice stream evolution over millennial timescales. The northwestern sector of the Laurentide Ice Shee...
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Duane Froese @tephrafan.bsky.social · 20/02/2025
I try to stick to work here, but the ongoing impasse between Edmonton Pub. Schools and the Educational Assistants and Support Workers has gone on for more than a month, affecting our family. More than 1000 kids are being denied access to education. I wrote an Op-Ed @edmontonjournal.bsky.social
edmontonjournal.com
Opinion: Edmonton students with disabilities abandoned during strike
For more than a month, approximately 1,200 Edmonton students with disabilities have been denied their fundamental right to education.
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Duane Froese @tephrafan.bsky.social · 07/02/2025
Today I finished my third (and final) year of #NSERC Geosciences Eval group. It’s a lot of work, but an enjoyable and rewarding form of service. A remarkable breadth of high quality thoughtful work, and a fair and consistent evaluation process in my experience.
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paulseesequasis @pseesequasis.bsky.social · 24/01/2024
In autumn, 1945, American photographer Gordon Parks flew up to Yellowknife on assignment with Standard Oil to do a photo feature but bad weather kept him from his intended destination. Instead he was invited to a nearby Dene community…
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Duane Froese @tephrafan.bsky.social · 27/01/2025
Behind a paywall but a nice profile of Beth Shapiro. We’ve been friends and worked together for 25 or so years. Always creative and now one of the biggest critics of de-extinction is redefining what it might mean for conservation genetics. Worth a read. www.washingtonpost.com/climate-envi...
washingtonpost.com
The dodo bird is extinct. This scientist says she can bring it back.
The company she works for is betting millions it can realize a once-far-fetched idea of “de-extinction.”
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Duane Froese @tephrafan.bsky.social · 07/01/2025
#Permafrost is the most exceptional material for the preservation of past life on the planet. A gram of permafrost can have more than 10^9 fragments of DNA, representing the plants, animals and microbial communities when the material was accumulating. #Klondike #Beringia
View of ice and organics within a permafrost core. Ice veins are shiny and dark colours represent organic matter ca 20,000 years old. Exposure of relict permafrost with drill from the Klondike area of central Yukon within the Trondek Gwichin Territory. The indefatigable Emma Tom Tom, who works excavating the upper part of a Middle Pleistocene mammoth in June 2024. An ancient soil (paleosol) exposed in the Klondike, dating to  the last glacial maximum. The turbic nature reflects cryoturbation in a grassy tussock tundra environment
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Duane Froese @tephrafan.bsky.social · 07/01/2025
View of the Mountain River joining the Mackenzie (Deh Cho) upstream of Fort Good Hope. The Mackenzie (looking north) widens with the addition of the coarse load, becoming braided upstream of the Ramparts. #Sahtu region, #NWT
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Duane Froese @tephrafan.bsky.social · 19/12/2024
#FossilFriday appreciation of our cover of the new #Beringia AAAR collection, a fossil rich locale on the Old Crow R. in Vuntut Gwitchin Territory. A river trip with 3 (then) graduate students. More than 1000 Pleist fossils: 70+ mammoth teeth, horses, hyena, camel, giant beaver, sloth and caribou.
Mammoth teeth in a pile of bones. Two tired students with more than 1000 fossils from a single locale, collected in 2-3hrs from the head of a point bar at low water. The point bar site that took 4 of us 2-3hrs to collect the pile of fossils in the left of the photo. Two juvenile and one mature mammoth tooth.
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Greg Fiske @gfiske.bsky.social · 05/12/2024
Arctic Indigenous mapmakers are reclaiming the past, shaping their future. A new story by Jess Howard @permafrostpathways.bsky.social highlighting our collaborative mapping efforts with Esri and native Alaskan communities. permafrost.woodwellclimate.org/arctic-indig...
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Duane Froese @tephrafan.bsky.social · 04/12/2024
Congratulations Dr. Cocker on a successful PhD defence of ‘Arctic ground squirrel middens as palaeoecological archives of east Beringia’. Many thanks to Allan Ashworth for making the trip, and Beth Shapiro, Britta Jensen and JP Zonneveld for examining the dissertation. Great things ahead.
Avery happy newly minted PhD sitting with his more experienced external examiner.
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Duane Froese @tephrafan.bsky.social · 28/11/2024
A view from this past September of talus and rock glaciers on the northeast facing aspect of the Norman Range, NWT in the #Sahtu area.
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Brendan O’Neill @permafrostee.bsky.social · 28/11/2024
Check out the #permafrost pack and let me know if you should be on it! Please share far and wide and yell into the BlueSky from the frozen mountaintops to the Arctic tundra! go.bsky.app/UhFqWzJ
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Duane Froese @tephrafan.bsky.social · 22/11/2024
It came from the #permafrost… #FossilFriday— a juvenile horse lower leg with soft tissue from the Klondike. Distal long bones are the most common Pleistocene mummified remains recovered, having been partially scavenged. #Yukon #Beringia, Tr'ondëk Hwëch'in Territory.
View of sub-fossil horse hoof held by researcher recovered from permafrost. Side view of lower leg, with outer layer of keratin degraded.
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Duane Froese @tephrafan.bsky.social · 21/11/2024
I'm a Quaternary/permafrost geoscientist focused on ground ice, its vulnerability, and the exceptional things found in permafrost. I work with northern govts and communities to understand permafrost change with occasional digressions into the paleo world of permafrost.
Partially drained lake ruined by diverse vegetation.  Guardians from K’ash Got’ine Foundation collecting peat cores within Tuyeta protected area   Degrading ice-rich peat plateau (yellow lichen covered) collapsing into unfrozen fen in NWT.  Organic rich ice wedge within yedoma sediments in unglaciated Yukon has been frozen for >50,000 years.
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Duane Froese @tephrafan.bsky.social · 14/11/2024
Not sure if one tweets or skies here but hopefully Pleistocene mummies can find a home here. www.nature.com/articles/s41...
nature.com
Mummy of a juvenile sabre-toothed cat Homotherium latidens from the Upper Pleistocene of Siberia - Scientific Reports
Scientific Reports - Mummy of a juvenile sabre-toothed cat Homotherium latidens from the Upper Pleistocene of Siberia
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