At the risk of being obvious, nowhere.
That being the case, I must have meant something else, mustn't I?
That "something else" was to point out that the idea was patently absurd.
Simply counting the rings in a piece of dead log provides no useful data, in the absence of context. What was missing from the article (and also missing from my understanding) was the context.
Thank you for the link.
Professor Mike Baillie has done some interesting work in dendrochronology.
"Archaeologist and palaeoecologist with research interests in dendrochronological and chronological issues. Teaches chronological and environmental issues in palaeoecology plus human evolution. Research record in tree-ring chronology construction for radiocarbon calibration and reconstruction of past environmental change."