In comparison to interglacials and interstadials, during glacials and stadials, the amount of ¹⁸O in the shells of foraminifera proportional to the amount of ¹⁶O:

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During glacials and stadials, the amount of ^18O (oxygen-18) in the shells of foraminifera is higher compared to interglacials and interstadials. This is because more ^16O (oxygen-16) is trapped in ice sheets, leaving a higher proportion of ^18O in ocean water, which then gets incorporated into the shells of foraminifera.

In Comparison to Interglacials and Interstadials, During Glacials and Stadials