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Plotting several curves can allow the archaeologist to develop a relative chronology for an entire site or group of sites.

For detailed information about how seriation works, see Seriation: A Step by Step Description.

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.

Seriation, on the other hand, was a stroke of genius.Determining calendar rates using dendrochronology is a matter of matching known patterns of light and dark rings to those recorded by Douglass and his successors.Dendrochronology has been extended in the American southwest to 322 BC, by adding increasingly older archaeological samples to the record.In 1929, they found a charred log near Show Low, Arizona, that connected the two patterns.It was now possible to assign a calendar date to archaeological sites in the American southwest for over 1000 years.

Stratigraphy is the oldest of the relative dating methods that archaeologists use to date things.