Yes, you can see them. I’m just wondering about the distribution of radioactive material when minerals start replacing cellulose during the process of petrifying. Can you still rely on readings that would normally concentrate in an annual growth band?
If you know each ring corresponds to one years growth, and you can match wide-narrow 'bar codes' from an early portion a tree growing today to a late portion of a tree long dead (say, roof beams in an Anasazi dwelling), and the 'bar code' close to the heart of that to a deep water preserved keel from a Roman era ship, and so on, you know exactly how old a piece of wood large enough to have enough rings really is. If it still has the bark, you can even tell the season, it died, whether it fell in spring or fall!