Dendro dating wood
A recent attempt to use tree ring analysis on olive trees (Cherubini and colleagues) revealed that too much variation of the cambium occurs in olives to make dendrochronology viable.That study was one of ongoing attempts to determine a reliable chronology of the Mediterranean Bronze Age.Evergreen cambiums are commonly irregular and not formed annually.
Some historical sources had reported the Qinghai route was abandoned by the 6th century AD: dendrochronological analysis of 14 tombs along the route identified a continuing use through the late 8th century.
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.
Tree-ring dating was one of the first absolute dating methods developed for archaeology, and it was invented by astronomer Andrew Ellicott Douglass and archaeologist Clark Wissler in the first decades of the 20th century.
Douglass was mostly interested in the history of climatic variations exhibited in tree rings; it was Wissler who suggested using the technique to identify when adobe pueblos of the American southwest were built, and their joint work culminated in research at the Ancestral Pueblo town of Showlow, near the modern town of Showlow, Arizona, in 1929. Judd is credited with convincing the National Geographic Society to establish the First Beam Expedition, in which log sections from occupied pueblos, mission churches and prehistoric ruins from the American southwest were collected and recorded alongside those from living ponderosa pine trees.