Crossdating by skeleton plotting
While in the field, several examples of good sites that addressed certain questions were given.Skeleton plotting is a graphical method to crossdate samples.So, to determine the age of a tree, one can simply count the number of rings in a cross-section of the trunk.According to Rocky Mountain Tree-Ring Research, the oldest tree dated by direct ring-counting was a sequoia in northern California that was 2200 years old when it died (older ages have been claimed for other trees, but those were measured using carbon dating or crossdating, described below). LTRR-SRP-II (2008) The Current Drought In Context: A Tree-Ring Based Evaluation of Water Supply Variability for the Salt-Verde River Basin Final Report. Report prepared for the California Department of Water Resources, July 2001. Upper Green River Basin (USA) streamflow reconstructions.
The principle of dendrochronology In temperate regions trees form a growth ring per year.
Crossdating allows the identification of the exact year in which each ring was formed by matching ring-width variations among trees growing in the same area.
Classroom lectures were held on: The first group, Team Magic Ring led by Dr.
Reconstructed Sacramento River System Runoff From Tree Rings.
Medieval Drought in the Upper Colorado River Basin. Crossdating Demo Paul Sheppard of the University of Arizona's Laboratory of Tree-Ring Research (LTRR) has an online demo for practicing the crossdating technique ("skeleton plotting") widely used to date tree rings.