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For example, JJA Worsaae used this law to prove the Three Age System.Seriation, on the other hand, was a stroke of genius.
Using local pine trees, Douglass built a 450 year record of the tree ring variability.
In 1901, Douglass began investigating tree ring growth as an indicator of solar cycles.
Douglass believed that solar flares affected climate, and hence the amount of growth a tree might gain in a given year.
Since the turn of the century, several methods to measure elapsed time have been discovered.
The first and simplest method of absolute dating is using objects with dates inscribed on them, such as coins, or objects associated with historical events or documents.