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H I S T O R Y O F D E N D R O C H R O N O L O G Y
NOT ONMID-TERM
THE PRINCIPLE OF
ECOLOGICAL AMPLITUDE
THE PRINCIPLE OF
SITE SELECTION
THE PRINCIPLE OF
AGGREGATE TREE GROWTH
THE PRINCIPLE OF
REPLICATION
STANDARDIZATION
THE PRINCIPLE OF
CROSS-DATING
RINGS IN THE BRANCHES OF SAWED TREES SHOW
THE NUMBER OF YEARS AND, ACCORDING TO THEIR
THICKNESS, THE YEARS WHICH WERE
MORE OR LESS
DRY.
“
”Leonardo da Vinci
Photograph: Anshul Nigham
“
”Theophrastus (371 - 287 BC)
... and if one forces a stone or similarobject into a tree, it becomes hidden,since the new growth surrounds it,as was the case with the wild olive treewhich stood in the market place at Megara.
Henri-Louis Duhamel du Monceau1700 - 1782
Georges-Louis Leclerc, Comte de Bu!on1707 - 1788
Photograph: Fri!s Schweingruber
Frost ring Pinus sibirica
1737!1708
Carl Linnaeus 1707 - 1778
Photograph: brewbooks
Alexander Twining1801 - 1884
“...every tree told the same story.”
Tucson, AZ
Flagsta!, AZ
Andrew Douglass (right) Flagsta! 1898
Photograph: Sam Wise
Lowell Observatory Flagsta! Arizona
Tucson, AZ
Photograph: Howard Arno!
Photograph: Christine and John Fournier
We do not know how old these ruins are, but I should be glad to have an opinion from you as to whether it might be possible to connect up with your modern and dated trees specimens [with wood specimens] from these [prehistoric] ruins by correlating the curves of growth…
“
”Clark Wissler to A.E. Douglass, 1909
Aztec Ruin
Publo Bonita
Photograph: Sco! Catron
Aztec Ruin National Monument New Mexico
Photograph: Chris M
Pueblo Bonito New Mexico
Pueblo Bonito New Mexico (before it was excavated)
Photograph: Stones 55
Wupatki New Mexico
National Geographic ‘Beam Expeditions’ 1920s
Show Low, AZ
$5for
100 rings
$65for
100 rings2011 dollars
1900180017001600150014001300
Living-tree chronology
‘Floating’ chronology
1900180017001600150014001300
HH-39
Living-tree chronology
‘Floating’ chronology
1900180017001600150014001300
120011001000900800700
HH-39
Living-tree chronology
‘Floating’ chronology
For the three of us, the experience was unforge!able. To be present at the instance of the celebrated breakthrough in science that set the chronological house in order for the Southwestern United States was reward enough. But beyond that, was the privilege to work for a time at the side of Douglass, the scholar, the astronomer turned archaeologist.
“
”Emil Haury, 1962
Tree-ring display at elementary school
Photograph: Tom Swetnam
FUTURELAB EXERCISE
Photograph: Kurt Kipfmueller
Photograph: Kurt Kipfmueller
Photograph: Kurt Kipfmueller
Photograph: Calvin Farris
Photograph: Calvin Farris
Photograph: Calvin Farris
