In essence, crossdating involves a form of pattern matching.

Unfortunately, any given tree may sometimes have a missing ring or a false ring present and therefore every ring we count thereafter is thrown off by one or two years.

However, we can look for certain years that offer good "signals" (very thin or very wide rings) and identify them in each core and confirm they occur at the year they should in each core.

The purpose of this lab is to learn the basic field, lab, and computational procedures necessary to conduct dendrochronological research.

In this particular exercise, we wish to examine whether there is a relationship between local climate (precipitation) and tree rings using white oak (Quercus alba) in southeastern Ohio.

Ring width in both species was significantly correlated with air temperature during the preceding summer.

Potential physiological explanations for these results are discussed.Older browsers that do not support HTML5 and the H.264 video codec will still use a Flash-based video player.We recommend downloading the newest version of Flash here, but we support all versions 10 and above. Fortunately, Paul Sheppard has produced an awesome web site that explains the concept of crossdating tree rings and provides an inter-active tutorial for you to practice on to learn the skill.I strongly suggest you follow all the steps at this site and then practice using the tutorial at step 12.Further study is required to verify the results of climatological analysis and to explore the causes of variation in signal strength within and between trees.