Fig. S2.

Turkana Basin large mammal dataset. (A) Distribution of specimens identified to species, and the relationship between number of specimens and in-bin species richness in the raw data (Inset, R² = 0.60). (B) Raw sampling completeness and evenness. At an arbitrary 70% cutoff (dashed line), only the 3.25–1.5 Ma series approaches sufficient sampling quality for analysis. (C) Raw origination, singleton, and extinction values. (D) Subsampled origination, singleton, and extinction values. (E) Raw species richness. (F) Subsampled mean (±SD) species richness. (G) In-bin species richness as subsampled using the shareholder quorum method. (H) Subsampled Foote origination and extinction rates calculated with bovids excluded. (I) Subsampled and corrected two-timer rates. (J) Subsampled Foote origination and extinction rates calculated with Shungura Formation excluded.