2. H I STO RY O F D E N D R O C H R O N O LO GY

3. NOT ON
MID-TERM

4. THE PRINCIPLE OF
CROSS-DATING
THE PRINCIPLE OF
AGGREGATE TREE GROWTH
THE PRINCIPLE OF
REPLICATION
STANDARDIZATION
THE PRINCIPLE OF
ECOLOGICAL AMPLITUDE
THE PRINCIPLE OF
SITE SELECTION

5. “ 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

6. “ ... and if one forces a stone or similar
object into a tree, it becomes hidden,
since the new growth surrounds it,
as was the case with the wild olive tree
which stood in the market place at Megara.”
Theophrastus (371 - 287 BC)
Photograph: Anshul Nigham

7. Henri-Louis Duhamel du Monceau Georges-Louis Leclerc, Comte de Buffon
1700 - 1782 1707 - 1788

8. Frost ring Pinus sibirica
Photograph: Fri s Schweingruber

9. 1737
!1708

10. Carl Linnaeus 1707 - 1778
Photograph: brewbooks

11. Alexander Twining
1801 - 1884

12. “...every tree told the same story.”

13. Tucson, AZ

16. Flagstaff, AZ

17. Andrew Douglass (right) Flagstaff 1898

18. Lowell Observatory Flagstaff Arizona
Photograph: Sam Wise

21. Tucson, AZ

24. Photograph: Howard Arno

25. Photograph: Christine and John Fournier

26. “ 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

27. Aztec Ruin
Publo Bonita

28. Aztec Ruin National Monument New Mexico
Photograph: Sco Catron

29. Pueblo Bonito New Mexico
Photograph: Chris M

30. Pueblo Bonito New Mexico (before it was excavated)

31. Photograph: Stones 55

32. Wupatki New Mexico

33. National Geographic ‘Beam Expeditions’ 1920s

34. Show Low, AZ

35. $5
for
100 rings

36. $65 2011 dollars
for
100 rings

38. Living-tree chronology
1300 1400 1500 1600 1700 1800 1900
‘Floating’ chronology

39. Living-tree chronology
1300 1400 1500 1600 1700 1800 1900
HH-39
‘Floating’ chronology

40. Living-tree chronology
1300 1400 1500 1600 1700 1800 1900
HH-39
700 800 900 1000 1100 1200
‘Floating’ chronology

41. “ 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

43. Tree-ring display at elementary school
Photograph:Tom Swetnam

48. FUTURE
LAB EXERCISE

49. Photograph: Kurt Kipfmueller

50. Photograph: Kurt Kipfmueller

51. Photograph: Kurt Kipfmueller

52. Photograph: Calvin Farris

53. Photograph: Calvin Farris

54. Photograph: Calvin Farris