Extended Data Fig. 3: Detailed stratigraphic sections with positions of samples that were investigated and analysed for leaf wax, pollen and phytolith content.

All sections are in centimetres except for MRD18-03. Names of sections are listed at the top of each column and equivalent section names reported in Fig. 2 are listed in parentheses. The number associated with each sample identifier is listed next to the dot that indicates the stratigraphic position of samples. If sample numbers are equivalent stratigraphically to other samples, this is noted in parentheses. Tuff numbering is included on the left of each column. Dashed lines provide ties between stratigraphic and lithologic equivalent horizons for non-tuffaceous units. The tuff numbering scheme also indicates tie points. Facies classification abbreviations are from a previously published study⁴⁵. F, S and G indicate grain size (clay or silt size, sand size and gravel size, respectively) and the descriptors m, h, l, p and t describe the primary bedding as massive, horizontal, laminated, planar and trough, respectively. Listed latitudes and longitudes are in reference to the WGS-84 datum and indicate the position of the base of the section unless otherwise noted. The stratigraphic positions for samples WM18-MRD-210, -413, -414, -416 (section S4) and WM18-LHG-258 (section S2) can be found in Fig. 2.