In 1937 A. E. Douglass, founder of the modern science of dendrochronology, established the Laboratory of Tree-Ring Research at the University of Arizona. The Tree-Ring Lab is recognized worldwide as a preeminent center for the advancement of tree-ring techniques and the broad application of dendrochronology in the social and environmental sciences.

Wednesday, December 2

Friday, December 4


oak in California
LTRR researchers Soumaya Belmecheri and Valerie Trouet are lead authors of a study showing the current Sierra Nevada snowpack to be the smallest in 500 years. Read more...
Change Over Time on display in the Bannister Building exhibit area
An art exhibit, “Marking Time to a Changing Planet”, is now on display in the Bannister Building. Read more...
The STEMM team and their grant award
Margaret Evans from the LTRR in an environmental education innovation. Read more...
detail of the newsletter
Articles teaching tree rings to kids appear in a newsletter. Read more...
Fire history work in the Tree-Ring Lab
An Australian documentary on mega-fires features the LTRR fire history and climate reconstruction. Read more...
Swetnam close-up, forest canopy top below.
A newspaper article highlights the career of retiring LTRR Director Tom Swetnam. Read more...