A micropaleontologist measures oxygen isotope ratios in foraminifera shells. The δ¹⁸O value increases by 0.5‰ per 1°C drop in ocean temperature. If a sample shows a δ¹⁸O increase of 2.4‰ compared to modern levels, what was the approximate temperature decrease?

Mon, 04 May 2026 04:17:24 +0000

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