TexasGuy
Joined: 16 May 2005 Posts: 26 Location: Porter Texas
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Posted: Thu Jun 08, 2006 11:57 pm Post subject: Late Holocene Climate and Culteral Change in the Southwest |
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http://epsc.wustl.edu/courses/epsc484/polyakandasmerom.pdf
excerpt
Columnar stalagmites in caves of the Guadalupe Mountains during the late
Holocene record a 4000-year annually resolved climate history for the southwestern United States. Annual banding, hiatuses, and high-precision uraniumseries dating show a present day–like climate from 4000 to 3000 years ago, following a drier middle Holocene. A distinctly wetter and cooler period from 3000 to 800 years ago was followed by a period of present day–like conditions,with the exception of a slightly wetter interval from 440 to 290 years beforethe present. The stalagmite record correlates well with the archaeologicalrecord of changes in cultural activities of indigenous people. Such climatechange may help to explain evidence of dwelling abandonment and populationredistribution. _________________ "Reality is that which, even when you stop believing, does not go away." |
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