Lichenometry is based on the assumption that the largest lichen growing on a rock is the oldest individual. If the growth rate is known, the maximum lichen size will give a minimum age for when this rock was deposited.
l ɪ t̠ʃ ə n ɑ m ə t ɹ i WORD_BOUNDARY ɪ z WORD_BOUNDARY b eɪ s t WORD_BOUNDARY ɔ n ð ɪ WORD_BOUNDARY ʌ s ʌ m p ʃ ə n WORD_BOUNDARY ð æ t ð ə WORD_BOUNDARY l ɑ ɹ d̠ʒ ɪ s t WORD_BOUNDARY l aɪ k ə n WORD_BOUNDARY ɡ ɹ oʊ ɪ ŋ WORD_BOUNDARY ɔ n WORD_BOUNDARY ʌ WORD_BOUNDARY ɹ ɑ k WORD_BOUNDARY ɪ z WORD_BOUNDARY ð ɪ WORD_BOUNDARY oʊ l d ɪ s t WORD_BOUNDARY ɪ n d ɪ v ɪ d̠ʒ uː ə l WORD_BOUNDARY ɪ f WORD_BOUNDARY ð ə WORD_BOUNDARY ɡ ɹ oʊ θ WORD_BOUNDARY ɹ eɪ t WORD_BOUNDARY ɪ z WORD_BOUNDARY n oʊ n WORD_BOUNDARY ð ə WORD_BOUNDARY m æ k s ɪ m ə m WORD_BOUNDARY l aɪ k ə n WORD_BOUNDARY s aɪ z WORD_BOUNDARY w ɪ l WORD_BOUNDARY ɡ ɪ v WORD_BOUNDARY ʌ WORD_BOUNDARY m ɪ n ɪ m ə m WORD_BOUNDARY eɪ d̠ʒ WORD_BOUNDARY f ɔ ɹ WORD_BOUNDARY w ɛ n WORD_BOUNDARY ð ɪ s WORD_BOUNDARY ɹ ɑ k WORD_BOUNDARY w ʌ z WORD_BOUNDARY d ɪ p ɑ z ɪ t ɪ d WORD_BOUNDARY