Table S1.

Global ichthyolith assemblage ratios used for Fig. 2

	Cretaceous					Paleocene
Site	Age, Ma	No. of samples	Teeth > 106 μm	Denticles > 106 μm	Ratio	Age, Ma	No. of samples	Teeth > 106 μm	Denticles > 106 μm	Ratio
DSDP 386	Maastricht	9	18	27	0.67	Danian	10	122	36	3.39
DSDP 596	76–66	42	605	935	0.65	66–56	36	1,051	631	1.67
ODP 8861	70.2–661	431	1,0021	1,4031	0.711	66–63.81	231	1,5921	1,2171	1.311
ODP 8862	70.2–662	432	1,0022	1,4032	0.732	66–63.82	232	1,5922	1,2172	1.692
ODP 8863	70.2–663	433	1,0023	1,4033	0.713	65.6–63.83	203	1,1573	6533	1.773
ODP 8864	70.2–664	434	1,0024	1,4034	0.714	66–63.84	234	1,374.54	9354	1.474
ODP 1262	66.9–66	45	52	50	1.04	66–62.1	117	447	218	2.05
IODP 1403	66.4–66	21	29	27	1.07	66–64.7	121	121	51	2.37
Gubibo	66.3–66	10	63	77	0.82	66–62.9	26	320	139	2.30

Different metrics for ODP Site 886 are explained in SI Materials and Methods, with superscript referring to the method used to calculate each ratio.