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As part of the University's COVID-19 response, the Tree-Ring Lab buildings are closed until further notice.
We continue to monitor phone and email messages, course and outreach activities continue online,
but we are not accepting visitors or deliveries.

  • Established by the pioneer of dendrochronology.

    A.E. Douglass, originator of the science of tree-ring dating, founded the Laboratory of Tree-Ring Research in 1937.
    https://ltrr.arizona.edu/about/history

  • Housed in a custom facility.

    A building constructed in 2013 provides lab and office space, augmented by a building recently renovated as a wood sample archive.
    https://ltrr.arizona.edu/building

  • Pursuing interdisciplinary research.

    Dendrochronology helps reconstruct environmental change, and unravel processes in ecosystems and human societies; researchers in many parts of the world collaborate with the Laboratory of Tree-Ring Research.
    https://ltrr.arizona.edu/research

  • Educating students and the public.

    The Laboratory of Tree-Ring Research teaches undergraduate and graduate courses; its outreach program also reaches thousands of children and adults in the community.
    https://ltrr.arizona.edu/courses

  • Established by the pioneer of dendrochronology.

  • Housed in a custom facility.

  • Pursuing interdisciplinary research.

  • Educating students and the public.

News

Tree Story by Valerie Trouet (hardback book)

Tree Story: dendrochronology for everyone

Monday, April 20, 2020

LTRR professor Valerie Trouet has written a popular book on the uses of tree-ring science Tree Story: The History of the World Written in Rings.

Read more
Overlapping stills from the videos.

Videos from the Evans research group

Thursday, April 9, 2020

Margaret Evans and her research group have recorded videos explaining the scientific background and their current work on forest ecosystems, climate change, and carbon cycling to a broad audience.

Read more
Gordion: the wooden casing within the Midas Mound tumulus

True calendar dates for ancient Eastern Mediterranean civilizations.

Wednesday, April 1, 2020

Charlotte Pearson and other LTRR researchers fix the chronologies for dating ancient Eastern Mediterranean civilizations, including a possible date for the Thera eruption, in a Proceedings of the National Academy of Sciences article.

Read more
Matt Salzer of the LTRR talks to Alex Ross of the New Yorker during the Schulman Grove fieldwork.

Bristlecone pines in The New Yorker magazine

Friday, January 24, 2020

LTRR researches feature prominently in an article on bristlecone pines (describing the background to the oldest trees, and first-hand accounts of the groves in the White Mountains of California).

Read more
Kiyomi Morino working with images of cells within a tree ring

TV coverage of ring formation research

Sunday, July 21, 2019

A PBS TV broadcast highlights LTRR research on tree ring formation by Malcolm Hughes and Kiyomi Morino.

Read more
Lei Wang and Jungang Dong of the Chinese Academy of Sciences in Xi’an, China, take a sample from an ancient southern Chinese pine tree on Mt. Helan in the western Loess Plateau of China.

Tree rings and the Asian Summer Monsoon

Thursday, May 30, 2019

Tree-ring study indicates an 80-year decline in Asian Summer Monsoon precipitation at its northern edge, which is consistent with increasing sulfur pollution according to climate modeling.

Read more
  • Read All News

Monday, August 24, Monday, August 31, Monday, September 7, Monday, September 14, Monday, September 21, Monday, September 28, Monday, October 5, Monday, October 12, Monday, October 19, Monday, October 26, Monday, November 2, Monday, November 9, Monday, November 16, Monday, November 23, Monday, November 30, Monday, December 7

  • 2:00 PM to 3:15 PM
    ANTH 204
  • 2:00 PM to 3:15 PM
    ANTH 204

Wednesday, August 26, Wednesday, September 2, Wednesday, September 9, Wednesday, September 16, Wednesday, September 23, Wednesday, September 30, Wednesday, October 7, Wednesday, October 14, Wednesday, October 21, Wednesday, October 28, Wednesday, November 4, Wednesday, November 11, Wednesday, November 18, Wednesday, November 25, Wednesday, December 2, Wednesday, December 9

  • 2:00 PM to 3:15 PM
    ANTH 204

See Calendar →

College of Science

Bryant Bannister Tree-Ring Building, 1215 E. Lowell Street, Tucson, AZ 85721-0045, USA office@ltrr.arizona.edu 520-621-1608

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