Quote:
Originally Posted by Katti's Cat
I know that - but it still doesn't cover the whole period to the beginning of time. Not that many trees around that are million of years out.
Using soil or other bore samples has actually shown that there have been extreme temperature movements and cycles.
Nevertheless - back to what I said previously: I won't hurt us to look after the world we live in. It's only on loan to us from future generations.
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From:
http://www.learnnc.org/lp/pages/1008
"Dendrochronologists have since used Douglass’s technique to make master sequences for several parts of the country. Most reflect regional growth patterns for distinct species. Much of this work focused on regions in the arid Southwest where ancient pinyon pines still live or exist as beams in old houses. In some places there, master sequences extend as far back as 8,700 years."
The seasons and temperatures etc are also mirrored and confirmed in glaciers and ice caps which also deposit in layers that can be matched and tied to tree-ring growth.