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A compass needle would have pointed to the south pole during some periods and to the north pole during others.Lava and volcanic ash deposits often contain the thermoremnant magnetic records of these reversals.Each region has its own unique master sequence since weather patterns are not the same from one area to another.However, the longer bristlecone pine sequence is of little value except for cross-checking the reliability of other dating techniques because logs of this species are rarely found in association with ancient humans.
The L-amino acid molecule form has an extension to the left, while the D-amino acid form has an extension to the right.
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Since weather patterns tend to run in cycles of a number of years, the sequence of tree-rings in a region will also reflect the same cycling, as illustrated by the graph below.
By cross-linking core samples from living and dead trees, a master sequence of annual tree-ring widths can be compiled.
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The L-amino acids change to D-amino acids more or less steadily following death. As a result, remains of organisms that died long ago will have more D-amino acids than ones that died recently.