ðə stˈækt ɹˈɛkɚd ʌvðə fˈɪfti sˈɛvən kˈoːɹz wʌz ˈɔːɹbɪɾəli tˈuːnd tʊ ɐn ˈɔːɹbɪɾəli dɹˈɪvən ˈaɪs mˈɑːdəl, ðə mɪlˈæŋkəvˌɪtʃ sˈaɪkəlz ʌv fˈoːɹɾi wˈʌn kˈaɪ əblˈɪkwᵻɾi, twˈɛnti sˈɪks kˈaɪ pɹɪsˈɛʃən ænd wˈʌnhˈʌndɹɪd kˈaɪ ˌɛksəntɹˈɪsᵻɾi, wˌɪtʃ ɑːɹ ˈɔːl ɐsˈuːmd tə kˈɔːz ˈɔːɹbɪɾəl fˈoːɹsɪŋ ʌv ɡlˈoʊbəl ˈaɪs vˈɑːljuːm.
The stacked record of the 57 cores was orbitally tuned to an orbitally driven ice model, the Milankovitch cycles of 41 ky (obliquity), 26 ky (precession) and 100 ky (eccentricity), which are all assumed to cause orbital forcing of global ice volume.