Dendrochronology is an example of what kind of dating

The interlopers defaced the ships, damaged the grave goods and pulled out and dispersed the bones of the deceased.

Fortunately for us, the looters left behind the tools they used to break into the mounds, wooden spades and stretchers (small handled platforms used to carry objects out of the tombs), which were analyzed using dendrochronology.

Example: analyzing ring widths of trees to determine how much rainfall fell per year long before weather records were kept.

The science that uses tree rings to study factors that affect the earth's ecosystems.

Dendrochronology is the formal term for tree-ring dating, the science that uses the growth rings of trees as a detailed record of climatic change in a region, as well as a way to approximate the date of construction for wooden objects of many types.

As archaeological dating techniques go, dendrochronology is extremely precise: if the growth rings in a wooden object are preserved and can be tied into an existing chronology, researchers can determine the precise calendar year--and often season--the tree was cut down to make it.

The ring widths were matched and cross-dated, and by the 1920s, chronologies were built back nearly 600 years. Haury, and dendrochronology conducted on Showlow eventuated the first single chronology for the southwest, extending over a period of over 1,200 years.

The first ruin tied to a specific calendar date was Kawaikuh in the Jeddito area, built in the 15th century; charcoal from Kawaikuh was the first charcoal used in (the later) radiocarbon studies. The Laboratory of Tree-Ring Research was established by Douglass at the University of Arizona in 1937, and it is still conducting research today.

But building a chronology of climate change in a region today is no longer based solely on tree-ring widths.

Example: dating the tree rings of a beam from a ruin in the American Southwest to determine when it was built.

The science that uses tree rings to study present climate and reconstruct past climate.

Regional long-term growth trends in the trees are responding strongly to the changing environment of water stress and warming temperatures.

Wang and Zhao used dendrochronology to look at the dates of one of the Silk Road routes used during the Qin-Han period called the Qinghai Route.

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Not all trees can be measured or used without additional analytical techniques: not all trees have cambiums that are created annually.

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