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But the most common proxies, including tree rings, pollen and ice cores containing pockets of ancient air, have already been well studied.—Hannah Richter, Scientific American, 7 May 2026 An examination of tree rings confirmed that a red aurora had occurred in China between 1200 and 1201 CE.—ArsTechnica, 2 May 2026 Dendrochronological dating, the method of using tree rings to establish the age of wood, match the year the ship was built.—CBS News, 2 Apr. 2026 Nothing makes foundation beds and tree rings pop with warm, cinnamon tones and that unmistakable earthy scent quite like a fresh layer of pine straw.—Jessica Safavimehr, Southern Living, 3 Mar. 2026 See All Example Sentences for tree ring