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After the cores are left to dry, they are glued vertically into a groove in a wooden block using water-soluble glue (carpenter's glue).

Once the cores are dry (left overnight), they are ready to be sanded using four progressively finer grades of sandpaper (120, 220, 320 and 600).

To compute a chronology based on tree rings, the width of each ring must be measured.

The type and accuracy of the measuring devices may vary.

For increased enhancement of cells, use a 1500 grit sandpaper.

The first step is to use skeleton plots of the tree-ring sequences to identify rings with unusual (very large or small) growth.

The following is an example of the *file that is run through COFECHA: Ring widths are not only affected by climate but also change with tree age, height within the stem, site-specific characteristics and site productivity (Fritts, 1976).

A good source of basic information is the tree-ring faq (frequently-asked-questions). Remove the spoon, place the core in a straw and tape the ends with masking tape. You may want to take more than one core to ensure the pith has been reached and for crossdating purposes.

For information about the general field of dendrochronology, please refer to Stokes and Smiley (1968), Fritts (1976), and Cook and Kairiukstis (1990). When you have reached the centre of the tree, insert the spoon carefully. Push it in as far as it will go, then unscrew the borer 1 turn.

Ayotte On this page is some basic information about collecting tree cores. Areas where annual rings may be distorted, such as near branches on uphill or downhill sides of the trunk, should be avoided.

Here you can also find a number of useful tips and solutions to problems: list of supplies you should have is found at: The Laboratory of Tree-Ring Research is a great place to start learning about the field of dendrochronology: Site selection depends on the question you are investigating. Once you have collected your cores, remove the taped ends to allow the cores to dry overnight or until needed.

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You need multiple cores of a tree to be able to crossdate the cores.

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