have documented the fall of Rome, recorded the eruption of volcanoes no one witnessed.
I don't buy it," Virginia Tech dendrochronologist
Carolyn Copenheaver said of the Lewis and Clark legend after she'd looked at a round cut from a branch that had fallen from the Red Hill tree some years earlier.
True, he refers to himself as a dendrochronologist
or a paleoclimatologist, depending on his mood when you ask him.
We are dendrochronologists
and tree biologists and we therefore focus our response on the tree-rings.
Until recently, most tree-ring researchers, known as dendrochronologists
, have looked at the total width of trees' annual rings to reconstruct past climate.
The study was conducted by archaeologists and dendrochronologists
from the Institute of Forest Growth in Freiburg, the Archaeological Heritage Office of Saxony in Dresden, and the Swiss Federal Research Institute WSL in Birmensdorf, Switzerland.
Further validation of the method has been demonstrated recently using cross-dating techniques first developed by dendrochronologists
, who look for synchronous growth patterns within a sampled population and use "signature years" to cross-reference between specimens of a sample (Black et al.
To sample the trees without damaging them, the dendrochronologists
used a tool like a metal screw that bores a tiny hole in the trunk of the tree and allows them to extract a sample, called a core.
Starting about 1930, tree-ring dating enabled dendrochronologists
to determine the construction dates of ancient buildings.
, who determine the dating of past events by examining the growth rings in trees, concluded that stream flows in parts of Colorado were the lowest in 300 years.
The rings in a trunk are its layers of sapwood and by studying them, scientists called dendrochronologists
(den-dro-chro-nol-o-gists), learn about the climate of the past.
At his opening address at the 12th Nobel Symposium on Radiocarbon Variations and Absolute Chronology  in Uppsala, Nobelist Kai Siegbahn emphasized that "This subject is [now] interesting to specialists in many different fields, as can be seen from the list of participants, showing archaeologists, chemists, dendrochronologists
, geophysicists, varved-clay geologists, and physicists" (Ref.