Figure 2: Foraminiferal extinction group against other parameters for the pre-extinction interval ∼0.8–1 Ma.
From: Mid Pleistocene foraminiferal mass extinction coupled with phytoplankton evolution

(a) Bottom-water temperature derived from foraminiferal Mg/Ca, (b) bottom-water Δ[CO32−] derived from foraminiferal B/Ca, (c) chlorin P410 from bulk sediment and (d) % small Gephyrocapsa.