ɪn pˌeɪliːoʊsˈaɪənsᵻz, ˈeɪtiːn ˈoʊ:sˈɪkstiːn ˈoʊ dˈeɪɾə fɹʌm kˈɔːɹəlz, fˈɔːɹɐmˌɪnɪfɚɹə ænd ˈaɪs kˈoːɹz ɑːɹ jˈuːzd æz ɐ pɹˈɑːksi fɔːɹ tˈɛmpɹɪtʃɚ.
In paleosciences, 18O:16O data from corals, foraminifera and ice cores are used as a proxy for temperature.