Extended Data Fig. 9: SOV comparison between the results using two PCA axes and ten PCA axes from ammonoids and conodonts.

a, Sum of variance of ammonoids, first two and ten PCA axes include 89.4% and 98.0% of total variations, respectively. b, Sum of variance of conodonts, first two and ten PCA axes include 66.6% and 7.6% of total variations, respectively. Vertical bars represent 95% quantiles, calculated from 10,000 bootstrap replicates for each subset.