will greatly enhance current understanding of preservation in amber and the biases in the amber fossil record. Acknowledgements We thank L. Seyfullah for helpful discussion and ERSF for synchrotron images. This research is supported by a Royal Society Newton Fellowship to VEM. The paper has also been improved by helpful comments from three anonymous reviewers. Figures Figure 1: Tables Summary table for the presence and absence of fossils in ambers outcrops, divided Table 1: into the different chemical groups. See Supplemental Table 1for details of each outcrop and references. No data Chemical % Fossiliferous on Total classification Fossiliferous inclusions Group A (class Ib, 62 383 14% 41 IV, V) 486 B (class II) 3 0 100% 5 8 Group C (class Ia) 5 0 100% 3 8 Group D (class Ic) 18 0 100% 7 25 Group E (class III) 0 0 ? 2 2 No data on group 19 5 79% 77 101 22% 107 388 135 630
will greatly enhance current understanding of preservation in amber and the biases in the amber fossil record. Acknowledgements We thank L. Seyfullah for helpful discussion and ERSF for synchrotron images. This research is supported by a Royal Society Newton Fellowship to VEM. The paper has also been improved by helpful comments from three anonymous reviewers. Figures Figure 1: Tables Table 1: Summary table for the presence and absence of fossils in ambers outcrops, divided into the different chemical groups. See Supplemental Table 1for details of each outcrop and references. Chemical classification Fossiliferous % Fossiliferous No data on inclusions Total Group A (class Ib, IV, V) 62 383 14% 41 486 B (class II) 3 0 100% 5 8 Group C (class Ia) 5 0 100% 3 8 Group D (class Ic) 18 0 100% 7 25 Group E (class III) 0 0 ? 2 2 No data on group 19 5 79% 77 101 107 388 22% 135 630