Tessera

Oxford Tephrochronology Group

@oxfordtephra.bsky.social

Our lab is based at the @unioxarchaeology.bsky.social, University of Oxford. We use #tephra to date sedimentary records and understand more about past explosive eruptions💥

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Oxford Tephrochronology Group @oxfordtephra.bsky.social · 3d ago

It has been a productive few weeks here in the Oxford Tephra Lab. We have been blasting through the sample preparation, ready for geochemical analysis. 💥🌋 @elowilkinsonrowe.bsky.social @danmclean.bsky.social & Louis Chambers @unioxarchaeology.bsky.social

Oxford Tephrochronology Group @oxfordtephra.bsky.social · last mo.

It’s great to be back in the field on Tenerife! 🌋 ☀️ Oxford Tephra Group members @volcrocks.bsky.social @danmclean.bsky.social and @elowilkinsonrowe.bsky.social have teamed up with Ethan Hamilton and Louis Chambers to sample some excellent outcrops they studied for their masters projects.

Danielle McLean @danmclean.bsky.social · 2mo ago

Need some motivation finishing up your #tephra paper this summer? 🌋📄 The deadline for submissions for the JQS Tephra Special issue has been extended until September. See more information here… onlinelibrary.wiley.com/page/journal... @cot-iavcei.bsky.social

Oxford Tephrochronology Group @oxfordtephra.bsky.social · 2mo ago

This week @elowilkinsonrowe.bsky.social and @danmclean.bsky.social joined the excavation of iconic MSA-LSA archaeological sites Dar es Soltan II and Contrabandies in Morocco. They are searching for microscopic volcanic ash layers to provide chronological constraints 🔍 🪏 🌋

Commission on Tephrochronology @cot-iavcei.bsky.social · 2mo ago

To all tephra fans, there will be a dedicated session "From Ash to Archive" to present your work on marine studies, eruptions chronologies and quantifications of volcanic events. Deadline postponed to June, 7th. ⏱️ When: October 19th to 22nd, 2026 📍Where: Santorini (Greece) & online 📝 Program below!

@elodielebas.bsky.social · 2mo ago

🌋🌊Very glad to announce that the 2nd Submarine Volcanism Workshop will be held on October 19th to 22nd, 2026 📍in Santorini (Greece) & online and 🗣️that the submission deadline for abstracts has been postponed to June 7th‼️🔗More information: lnkd.in/eSG_FH6M Looking forward to hosting you in Santorini‼️

Oxford Tephrochronology Group @oxfordtephra.bsky.social · 3mo ago

The CAVES Africa Project held a great two-day meeting in Oxford last week. Some exciting papers in the works!! @bryceotopes.bsky.social @kevinuno.bsky.social @volcrocks.bsky.social @elowilkinsonrowe.bsky.social @danmclean.bsky.social

Several of the CAVES Project members outside the Dyson Perrins Laboratory, School of Archaeology

Oxford Tephrochronology Group @oxfordtephra.bsky.social · 3mo ago

How can volcanic ash layers be used to link #archaeological and #climate records in NW Africa? Join the online @bilnas.bsky.social talk tomorrow with @danmclean.bsky.social

British Institute for Libyan & Northern African Studies (BILNAS)@bilnas.bsky.social · 3mo ago

Join us tomorrow at 5pm (UK time) for the next BILNAS lecture: 'Volcanic Ash Layers (Tephra) to Link Archaeological and Climate Records in North West Africa' by Dr Danielle McLean @danmclean.bsky.social 💻 Register here: us02web.zoom.us/webinar/regi... Online event. All welcome!

Oxford Tephrochronology Group @oxfordtephra.bsky.social · 3mo ago

Our first time attending #EGU26 and the @oxfordtephra.bsky.social had a blast 🌋 It was great to catch-up with colleagues and see some brilliant talks. Check out @elowilkinsonrowe.bsky.social @gavrkane.bsky.social @danmclean.bsky.social and @volcrocks.bsky.social in action... ⬇

PhD student Elo Wilkinson-Rowe presenting her talk on the chemical fingerprints of eruptions from Tenerife

PhD student Gavin Kane presenting his poster on the recent caldera-forming eruptions at Campi Fiegrei

Danielle McLean presenting her working that explores the relationship between volcanism and the ancient Maya

Prof. Victoria Smith presenting the CAVES Project and our new results!

Danielle McLean @danmclean.bsky.social · 3mo ago

🔔🌋Tonight is the @cot-iavcei.bsky.social social gathering at #EGU26 We will be meeting at 7Stern brewery from 8pm Note the kitchen closes at 9pm so please place any food ordered when you arrive. 🍲

Commission on Tephrochronology @cot-iavcei.bsky.social · 3mo ago

Note that the flyer says the COT social is on Wednesday, that is incorrect- it is on Tuesday! Oops! Please rsvp if interested! The link is correct. #EGU26 @tephraportal.bsky.social @oxfordtephra.bsky.social

Commission on Tephrochronology@cot-iavcei.bsky.social · 4mo ago

EGU is coming up fast and there is a lot going on! This includes two sessions on Monday and Tuesday, a social on Tuesday night, our townhall on Wed in Room N1 (7-8pm), and workshop on Thursday. Check out the attachment for details #EGU2026 @egu.eu @iavcei.bsky.social @oxfordtephra.bsky.social

This is a flyer describing events tied to the Commission on Tephrochronology at the European Geophysical Union meeting that kicks of Monday May 4th

There are two tephra-related sessions called
“Hazards related to explosive volcanism: tephra dispersal and pyroclastic density currents” Posters are on Tuesday 5th May, 08:30–10:15 in Hall X2 and Oral session on Tuesday 5th May, 16:15–18:00 Room 2.21. With invited speaker Mathieu Colombier of Munich University
And “Tephra research beyond boundaries: integrative applications and data-driven innovation in Earth system sciences” With Posters on Monday 4th May 08:30-10:15 in Hall X3; and Oral session on Tuesday 5th May 08:30-10:15 in Room 2.93. With invited speakers Matthew Loewen of the Alaska Volcano Observatory and Victoria Smith of the University of Oxford.

Other related meetings and workshops include The Commission on Tephrochronology Community Meeting on Wednesday 6th May, from 19:00-20:00 in Room N1. Join for updates and announcements, including the next venue of Tephra 2028 and other exciting events.

There is also the Tephra Information Portal Townhall on Thursday 7th May from 19:00-20:00 in Room M1. Find out what TIP is and how it is helping provide researchers with a central hub for discovering, accessing and sharing data.

There will be a StraboField Tephra workship. This is a free field app to collect tephra stratigraphic data: Runs on Tuesday May 5th from 16:15-18:00 and 19:00-20:00 in Room 2.42.
RSVP appreciated but not required at
https://forms.gle/PYbxoGLWV7b53WCg9

Finally COT is trying to organize a social after the COT Townhall on Wednesday May 6th after 8 pm. Details will follow the minute we know them!
Please RSVP ASAP for planning at https://forms.gle/zyhRJuXGEqps2ySW6

Commission on Tephrochronology @cot-iavcei.bsky.social · 4mo ago

Commission on Tephrochronology @cot-iavcei.bsky.social · 6mo ago

A great opportunity to submit a paper to a new joint publication between the AGU and Geological Society: Geohorizons special publication on tephra & hazards. Born our last International tephra meeting, they are still taking submissions! 🧪⚒️🌋 #tephra @geolsoc.bsky.social @agu.org @iavcei.bsky.social

Flyer for a Geohorizon special issue call for papers, it reads:

Tephra: from reconstructing past volcanic eruptions to
modelling and forecasting future hazards
Tephra produced during explosive volcanic eruptions can generate far-reaching social, economic, and environmental impacts with potentially devastating consequences for communities and livelihoods. By improving our understanding of how tephra is generated, transported and deposited - both during past events and ongoing activity - we can reduce these impacts and strengthen preparedness for future eruptions.
This GeoHorizons volume will assemble a collection of papers that advance tephra studies, reflecting significant developments in the field over the past two decades. The volume will be organized into three sections:
1- Reconstructing past eruptions
This opening section will highlight studies that use tephra to build eruption histories and reconstruct processes from historical and prehistoric explosive events. We welcome research
involving field and deposit-based investigations, studies of sedimentary, archaeological and ice archives, modelling of past eruptions, and textural, geochemical and petrological analysis.
2- The generation, dispersion and sedimentation of tephra
Focusing on recent or ongoing tephra-producing eruptions, this section invites studies examining trends in deposit characteristics such as grainsize and thickness, ash aggregation and particle settling processes, experimental work on plume dynamics and dispersion, and modelling of
tephra generation transport and deposition.
3- Forecasting and mitigating the impacts of future
explosive eruptions
The final section looks to the future, with topics including tephra dispersion and impact modelling, climatic impacts and projections, volcanic hazard mapping, and applied studies that support risk reduction.

second page of flyer for special issue that says:

This GeoHorizons volume will be of interest to physical volcanologists, geologists, tephrochronologists, hazard and climate modellers, and computational volcano and natural disaster scientists across academia, government and industry.

Contact us, we'd love to feature your research
If are interested in contributing to this volume, or have any questions, please get in touch with the volume editors via the email addresses listed below.
Volume Editors
Alastair G. E. Hodgetts (University of Edinburgh, UK) - alastair.hodgetts@ed.ac.uk
Thomas J. Aubry (University of Oxford, UK) - thomas.aubry@earth.ox.ac.uk
Frances M. Beckett (Met Office, UK) - frances.beckett@metoffice.gov.uk
Paul A. Jarvis (Earth Sciences New Zealand, New Zealand) - p.jarvis@gns.cri.nz
Britta J. L. Jensen (University of Alberta, Canada) - bjjensen@ualberta.ca
Elodie Lebas (Université Clermont Auvergne, France) - elodie.lebas@uca.fr

GeoHorizons is committed to the principles of open science. This volume will be published open access, and therefore eligibility under a Read and Publish agreement or the payment of an Article Processing Charge (APC) is required on acceptance of an article for publication. Corresponding authors at participating Read and Publish institutions can publish chapters in GeoHorizons at no charge.

Check if your institution has a Read and Publish agreement www.geolsoc.org.uk/OA

Oxford Tephrochronology Group @oxfordtephra.bsky.social · 6mo ago

Tephra group members @elowilkinsonrowe.bsky.social and @danmclean.bsky.social are analysing some beautiful volcanic ash shards #tephra this week at Royal Holloway University. 🌋 #tephratastic

Oxford Tephrochronology Group @oxfordtephra.bsky.social · 6mo ago

Greetings from Tenerife! And yes, it is as hot as it looks. Check out our postcard from the field: preview.shorthand.com/4lwIX8v1duOO... More about the CAVES Project here: caves.web.ox.ac.uk @unioxarchaeology.bsky.social @volcrocks.bsky.social @danmclean.bsky.social @emmalouisehorn.bsky.social

Oxford Tephrochronology Group @oxfordtephra.bsky.social · 6mo ago

Have you read this fantastic QSR paper by @elowilkinsonrowe.bsky.social et al.(2026)? Lake sediments from the Main Ethiopian Rift reveal refined eruption histories of Boset & Corbetti volcanoes over the Late Holocene, with improved age & volume constraints. www.sciencedirect.com/science/arti...

Fig. 1 from Wilkinson-Rowe et al. (2026). Regional overview map of the Main Ethiopian Rift focussing on key Late Pleistocene – Holocene active volcanic centres of the central rift and off-axis volcanic fields and fault branches. The YTVL (grey shaded area) depicts the Yerer Tullu-Wellel Volcanotectonic Lineament. Yellow dots indicate lake records at Babogaya, Dendi, Haro Kori, and Wergoba utilised in this study and blue dots indicate other lake records with published tephra horizons. The inset box provides the location for Fig. 2. Digital terrain model for base map from NASA Shuttle Radar Topography Mission (2013), modified in QGIS.

Oxford Tephrochronology Group @oxfordtephra.bsky.social · 6mo ago

🌋 New paper out in QSR! McLean et al. (2026) shows that the Aso-3 caldera-forming eruption (SW Japan) marks the termination of MIS 6, providing a key tephrochronological marker for correlating East Asian paleoclimate records. www.sciencedirect.com/science/arti... #Tephra #LakeSuigetsu #Aso

Fig. 8 from McLean et al. (2026). Flux of (a) marine diatom taxa Thalassiosira spp. + Cymatotheca (counts/mm2/year) and (b) percentages of Cryptomeria and Quercus-E pollen, recorded in the Lake Suigetsu (SG06) sedimentary sequence. The red dashed line indicates the position of the Aso-3 distal tephra layer (SG14-6662). The green bar marks the interval of laminated sediments corresponding to Marine Isotope Stage (MIS) 5e. Modified from Francke et al. (2025).

Commission on Tephrochronology @cot-iavcei.bsky.social · 6mo ago

XXII INQUA Congress 2027 in Lucknow, India. Abstract deadline: 15th Feb 2026 COT sponsored session on Tephrochronology across multiple disciplines. Should be fantastic for many tephra fans out there! 🧪⚒️🌋 @oxfordtephra.bsky.social @camtephra.bsky.social @iavcei.bsky.social @inquaecr.bsky.social

Tephra session advertisement for INQUA congress in India, 2027.

Oxford Tephrochronology Group @oxfordtephra.bsky.social · 7mo ago

Don’t forget to get your abstracts in for #EGU … there are some excellent #tephra sessions planned. 🌋🔍🚨

Commission on Tephrochronology@cot-iavcei.bsky.social · 8mo ago

Have a weird urge to write an abstract over Christmas? Tephrochronology Beyond Boundaries: Chronology, Correlation, and Innovation in Earth System Studies Tephrochronology Keynote: Victoria Smith Deadline: 15 Jan 2026, 13:00 CET @oxfordtephra.bsky.social @egu.eu @iavcei.bsky.social

Oxford Tephrochronology Group @oxfordtephra.bsky.social · 7mo ago

Thanks to #VMSG and the Local Organising Committee for a great start to 2026! We had a great time 🌋

Oxford Tephrochronology Group @oxfordtephra.bsky.social · 7mo ago

Check out this fantastic #tephratastic session at the EAA Annual Meeting in Athens (26-29 August 2026). 🌋🔍😍 203 – Advances in #Tephrochronology for Archaeological Research 🚨The call for Contributions deadline is 5 February.

Commission on Tephrochronology @cot-iavcei.bsky.social · 8mo ago

Session SSP2.7

meetingorganizer.copernicus.org

Britta Jensen @tephrabird.bsky.social · 8mo ago

@camtephra.bsky.social @oxfordtephra.bsky.social

Commission on Tephrochronology@cot-iavcei.bsky.social · 8mo ago

Just going to repost this - EGU is looking pretty special this year, especially for the tephra fans out there! #geology #volcano #tephra #egu2026 @egu.eu @iavcei.bsky.social 🌋🧪⚒️

Oxford Tephrochronology Group @oxfordtephra.bsky.social · 8mo ago

We’ve had a very productive few days at Royal Holloway University running trace element analyses for the CAVES Project @elowilkinsonrowe.bsky.social and @danmclean.bsky.social 🌋🔍🔬Excited to start plotting the data! 📈 #tephratastic

Oxford Tephrochronology Group @oxfordtephra.bsky.social · 9mo ago

Some fresh new cryptotephra samples ready to be analysed this week! 🌋 @elowilkinsonrowe.bsky.social @danmclean.bsky.social

Oxford Tephrochronology Group @oxfordtephra.bsky.social · 10mo ago

🚨New paper! Our latest study, led by Sophie Vineberg, integrates proximal & distal tephra records to reveal the timing and dispersal of large explosive eruptions at Aso volcano (Japan) 🌋 🔗 doi.org/10.1016/j.jvolgeores.2025.108436 #tephra #volcanology #Aso #Japan #LakeSuigetsu #tephrochronology

Oxford Tephrochronology Group @oxfordtephra.bsky.social · 11mo ago

🌋 New paper led by Emma Horn & the CAVES Project! We’ve characterised the glass geochemistry of 15 major Azores eruptions (~100 ka). This dataset provides fingerprints to trace Azores tephra across Europe, Africa & beyond. 🔎 🔗 doi.org/10.1016/j.jv... #Azores #Tephra #CAVESProject

Danielle McLean @danmclean.bsky.social · 11mo ago

It was great to join the INTIMATE network meeting in Cluj this week. 🦣❄️🕣 Some fantastic science coming soon!

Commission on Tephrochronology @cot-iavcei.bsky.social · 12mo ago

🔁📢 Call for papers - JQS Special Issue on distal tephra analysis Sponsored by IAVCEI Commission on Tephrochronology (COT) 🗓Deadline: 2 Jan 2026

Danielle McLean@danmclean.bsky.social · 12mo ago

🌋📢 Calling all #tephra researchers! Join us in shaping this new JQS Special Issue. "Beyond the #Eruption – Advances and Applications in Distal Tephra Analysis Across the Geosciences" Deadline: 2 Jan 2026. Further details below: onlinelibrary.wiley.com/page/journal...

Christine S. Lane @chslane.bsky.social · 12mo ago

Visiting a friend from my @oxfordtephra.bsky.social days and here’s the cup my morning coffee came in! #tephratastic