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As soil water declines through the summer, the cells become thicker-walled and more dense.

Methods The cores and disks are processed using standard laboratory techniques (Stokes and Smiley, 1968).That is, two poorly defined rings correspond to one calendar year and thus one is considered false.Sensitive tree-ring series contain the best signatures but can also have missing and false rings, and partial rings (growth truncated during growing season).Whereas the use of these methods is limited by the relatively short life spans of most tree species, evidence of earlier floods and landslides should exist in dead wood.Reconstructing geophysical events from dead wood is more involved, however, since the logs are not in situ and cross-dating is required to determine the years of anomalous growth.

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