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.

Tuesday, July 12

Tuesday, July 12

Wednesday, July 20


Coulthard examining a freshly extracted tree-ring core sample.
Tree rings reveal the history of severe drought in parts of British Columbia. Read more...
Sheppard holding the award plaque
Outstanding Forester of the Year award to the LTRR's Paul Sheppard. Read more...
The elgant conference logo, turning the map of the Americas into a tree.
The LTRR featured prominently in awards distributed at the Ameridendo2016 conference in Argentina. Read more...
Canyon walls near Nankoweap reflected in a calm stretch of the river
Connie Woodhouse and Kiyomi Morino of the LTRR are authors on a paper showing that temperature modulates the influence of rain and snowfall on Upper Colorado River Basin streamflow. Read more...
still image from the video interview
LTRR researcher Valerie Trouet talks about dendrochronology in a local TV interview. Read more...
Open stand of Pinus elliottii var. densa | Hurricane Katrina before landfall
Valerie Trouet of the LTRR and her colleagues use shipwrecks and tree rings to trace the history of hurricanes, finding fewer during a period of low solar activity. Read more...