Supplementary Fig. 1. Light microscope images of some Eocene–Oligocene calcareous nannofossils from the NKK-1 borehole. The Eocene–Oligocene Transition in Nanggulan, Java: lithostratigraphy, biostratigraphy and foraminiferal stable isotopes

Supplementary Fig 1. A selection of middle Eocene to lower Oligocene light microscope images of some biostratigraphically useful calcareous nannofossils (and others) from the NKK-1 borehole, central Java. Figs. 1 & 2. Reticulofenestra reticulata (Fig. 1, reproduced from *, Pl. 1, fig. 38; and **, Pl. 1, fig. 1). Fig. 2 reproduced from *, Pl. 1, fig. 44 and **, Pl. 1, fig. 8), Figs. 3 & 4. R. nanggulanensis (reproduced from Jones & Dunkley Jones (2020) Pl. 1, fig 40-41), Fig. 5. R. bisecta (reproduced from **, Pl. 1 fig. 32), Fig. 6. R. umbilicus (reproduced from **, Pl. 1, fig. 35), Fig. 7. Coccolithus pelagicus (reproduced from *, Pl. 1, fig. 12; and **, Pl. 2, fig. 3), Fig. 8. C. formosus (reproduced from *, Pl. 1, fig. 16; and **, Pl. 2, fig. 23), Figs. 9, 27 & 28. Reticulofenestra isabellae, (Fig. 9, reproduced from *, Pl. 1, fig. 9; and of **, Pl. 1, fig. 45; Fig 27 reproduced from *, Pl. 1, fig. 10; and of **, Pl. 1, fig. 46; Fig 28 reproduced from *, Pl. 1, fig. 11; and **, Pl. 1, fig. 47). Fig. 10. Calcidiscus bicircus (reproduced from **, Pl. 3, fig. 12) Fig. 11. Umbilicosphaera bramletti, Fig. 12. U. detecta, (reproduced from **, Pl. 3, fig. 19) Figs. 13 & 14. Discoaster saipanensis, Figs. 15 & 16. D. barbadiensis, (Fig. 15, reproduced from **, Pl. 6, fig. 3; Fig. 16, reproduced from **, Pl. 6, fig.6), Figs. 17 & 18. Clausicoccus subdistichus, (Fig. 17, reproduced from **, Pl. 3, fig. 1; Fig. 18 reproduced from **, Pl. 3, fig. 4), Figs. 19 & 20 Sphenolithus obtusus, (Fig. 19, reproduced from *, Pl. 1 fig. 31; and **, Pl. 6, fig. 29; Fig. 20, reproduced from *, Pl. 1 fig. 32; and **, Pl. 6, fig. 30), Figs. 21 & 22. S. akropodus, (Fig. 21, reproduced from *, Pl. 1 fig. 33; and **; Pl. 6, fig. 41; Fig. 22, reproduced *, Pl. 1 fig. 34; and **, Pl. 6, fig. 42), Figs. 23 & 24. S. tribulosus, (Fig. 23, reproduced from *, Pl. 1 fig. 35; and ** Pl. 6, fig. 35; Fig. 24, reproduced from *, Pl. 1 fig. 36; and ** Pl. 6, fig. 36), Figs. 25 & 26. Chiasmolithus grandis, (Fig. 25, reproduced ** Pl. 2, fig. 45; Fig. 26, reproduced ** Pl. 2, fig. 44). Sample information recorded under each image pertaining to each species. Where an image is a rotation of the same specimen as the preceding image, the sample information is not replicated. The same applies to different specimens that are the same species. * Jones et al., (2019); ** Jones & Dunkley Jones (2020).