A dendrochronologist must be able to read micro-rings just two cells wide, false rings embedded in a single annual ring, fuzzy ring boundaries in tropical trees, missing rings, pinched rings that are missing part of their circumference, frost rings
formed from freezing temperatures during the growing season, and fire scars that lack telltale charcoal.
Part of the reason that the plant grew such big rings was that, being near the South Pole, it had 24 hours of light throughout the summer." Also, Taylor found no frost rings
, the telltale signs of freezing conditions.