This PDF file includes:

• Supplementary Text
  
• fig. S1. Geological map of the Nigerian sector of the Dahomey Basin.
  
• fig. S2. Wall profiles for analyzed foraminifer species from the SQ.
  
• fig. S3. IB10A and IB10B TEX₈₆ and BIT correlations.
  
• fig. S4. Environmental reconstructions for the IB10B core.
  
• fig. S5. Bayesian TEX₈₆ calibrations using the IB10B data set and BAYSPAR tool (http://bayspar.geo.arizona.edu/) (46, 69).
  
• fig. S6. IB10B chemostratigraphy and stratigraphical ranges of selected foraminifera and dinocysts.
  
• fig. S7. IB10A chemostratigraphy and stratigraphical ranges of selected foraminifera and dinocysts.
  
• fig. S8. Sensitivity plots for δ¹⁸Ow and Mg/Ca_sw.
  
• table S1. Dinocyst assemblages for the Sagamu Quarry.
  
• table S2. Sea surface temperature (SST) data used in Figure 2D, E, G, H.
  
• References (53–100)

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Other Supplementary Material for this manuscript includes the following:

• Data tables (Microsoft Excel format)