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Paleo Slide Set: Tree Rings: Ancient Chronicles of Environmental Change
The Giant sequoia (Sequoiadendron giganteum) is the largest tree species on earth.
Extending a chronology based on living trees further back in time through crossdating.
Keet Seel Ruins, Navajo National Monument, Arizona
Diagram of rings in a young conifer from Fritts, 1976.
Green ash (Fraxinus pennsylvanica) ring structure, including clearly visible vessels.
False rings in Mexican cypress (Cupressus lusitanica).
Locally absent ring in Scots pine (Pinus sylvestris).
Coring huon pine (Lagarostrobus franklinii) in Tasmania.
Cutting cross-section from subfossil huon pine (Lagarostrobus franklinii) log, Tasmania.
Mounted huon pine (Lagarostrobus franklinii) core samples.
Skeleton plots
Measuring a tree-ring core on a moveable-stage microscope.
Plot of several individual ring-widths series illustrating the need for standardization.
Foxtail pines (Pinus balfouriana) at upper treeline, Sierra Nevada Mountains, California.
Baldcypress (Taxodium distichum) in Bayou DeView, Arkansas.
Bristlecone pine (Pinus longaeva), White Mountains, California.
Observed & reconstructed number of precipitation days in winter, northern Arizona & New Mexico.
Reconstructed Palmer Drought Severity Index for 1863, from Cook et al, 1997
Precipitation reconstruction for western New Mexico from Grissino-Mayer, 1996.
World map of tree-ring sites, International Tree-Ring Data Bank
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Last Modified: 12 October 2001

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