Aitken 1990 science based dating in archaeology

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In this way, an uninterrupted sequence of tree rings can be extended far into the past.

The first such published sequence, based on bristlecone pine tree rings, was created in the 1960s by Wesley Ferguson.

The improvements to these curves are based on new data gathered from tree rings, varves, coral, and other studies.

Significant additions to the datasets used for INTCAL13 include non-varved marine foraminifera data, and U-Th dated speleothems.

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In both cases, related concepts are explored, namely synchronism and anachronism respectively.

The paper offers a critique of these conventional usages of the idea of contemporaneity and argues for an alternative, linking this with the concept of consociation, a term coined by the phenomenologist Alfred Schutz in the early 20th century.

Dendrochronology or the study of tree rings led to the first such sequence: tree rings from individual pieces of wood show characteristic sequences of rings that vary in thickness because of environmental factors such as the amount of rainfall in a given year.

These factors affect all trees in an area, so examining tree-ring sequences from old wood allows the identification of overlapping sequences.

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