Have any of you ever used this technology to date timbers? I'd like to have some samples dated and would like a reference on someone to use.

I learned of one guy in Oxford, England via History Detectives on PBS. Is there anyone who does this domestically?

I have some timbers from an old barn I dismantled; incredibly slow growing Hemlock (my best guess). Within a 3x4 brace i can count 350 rings (under a microscope) and see within about 10-15 rings of the heart. this barn was built in the mid/late 18's so i can come up with a felling date of around 1500+/- if I assume the tree was only as big as the brace (~8" diameter max).

I want to be able to label significant National events with flags on the rings and display it in the house, so am looking for better accuracy in my work.... I'd love to be able to put a flag saying "Christopher Columbus lands".

Thanks.

Shaun