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GEOG5839.14, The history of dendrochronology

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GEOG5839.14, The history of dendrochronology

  1. 1. October 25The history of dendrochronology
  2. 2. “ RINGS ” IN THE BRANCHES OF SAWED TREES SHOWTHE NUMBER OF YEARS AND, ACCORDING TO THEIR THICKNESS, THE YEARS WHICH WERE MORE OR LESS DRY. Leonardo da Vinci
  3. 3. “ ... 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
  4. 4. Henri-Louis Duhamel du Monceau Georges-Louis Leclerc, Comte de Buffon 1700 - 1782 1707 - 1788
  5. 5. Frost ring Pinus sibiricaPhotograph: Fri s Schweingruber
  6. 6. 1737 ➟1708
  7. 7. Alexander Twining 1801 - 1884
  8. 8. “...every tree told the same story.”
  9. 9. Tucson, AZ
  10. 10. ANDREW ELLICOTTDOUGLASS
  11. 11. Flagstaff, AZ
  12. 12. Andrew Douglass (right) Flagstaff 1898
  13. 13. Lowell Observatory Flagstaff ArizonaSource: Sam Wise
  14. 14. Source: Schiaparelli (1888)
  15. 15. Tucson, AZ
  16. 16. Photograph: Howard Arno
  17. 17. Photograph: Christine and John Fournier
  18. 18. “ 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
  19. 19. Aztec RuinPublo Bonita
  20. 20. Aztec Ruin National Monument New MexicoSource: Sco Catron
  21. 21. Pueblo Bonito New MexicoSource: Chris M
  22. 22. Pueblo Bonito New Mexico (before it was excavated)
  23. 23. Source: Stones 55
  24. 24. Wupatki New Mexico
  25. 25. Living-tree chronology 1300 1400 1500 1600 1700 1800 1900‘Floating’ chronology
  26. 26. National Geographic ‘Beam Expeditions’ 1923 and 1929
  27. 27. Show Low, AZ
  28. 28. $5 for100 rings
  29. 29. $65 2011 dollars for100 rings
  30. 30. Living-tree chronology 1300 1400 1500 1600 1700 1800 1900 1237 1380 HH-39700 800 900 1000 1100 1200 ‘Floating’ chronology
  31. 31. “ 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
  32. 32. Tree-ring display at elementary school Photograph:Tom Swetnam
  33. 33. GEOG8280 XT C L AS SNE

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