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Fully anchored chronologies which extend back more than 10,000 years exist for river oak trees from South Germany (from the Main and Rhine rivers). Another fully anchored chronology which extends back 8500 years exists for the bristlecone pine in the Southwest US (White Mountains of California)
In 2004 a new calibration curve INTCAL04 was internationally ratified for calibrated dates back to 26,000 Before Present (BP) based on an agreed worldwide data set of trees and marine sediments.
Continental drift is approximately an inch a year, how many inches between Africa and South America ?.
Quote from: RD on 21/05/2010 07:16:41Continental drift is approximately an inch a year, how many inches between Africa and South America ?.But that is based on an assumption that drift occurs at a linear rate. But could the rate of drift be non-linear?
AND - varves go back a LOOOOONG time. Banded iron formation several billion years old are also varves as they were PROBABLY deposited in a lacustrine environment.
Please refer to the word "probably" - It is an explanation I have heard bandied about. I am not infallible, although mostly I believe I am :-)