Figure 3.

Changes among Late Mesozoic vertebrate herbivores and omnivores. (Top, histograms) Body mass distribution of herbivorous vertebrates for Late Jurassic and Cretaceous terrestrial faunas; methodology and data for Morrison, Wealden, Judith River, and Lance faunas from ref. 6. Groups: 1, <10² g; 2, 10²-10³ g; 3, 10³-10⁴g; 4, 10⁴-10⁵ g; 5, 10⁵-10⁶ g; 6, 10⁶-10⁷ g; 7, 10⁷-10⁸ g. (Top Right) Generic diversity among multituberculate mammals through the Cretaceous: points based on (Left to Right) Trinity (37), Cedar Mountain (38), Dakota (39), Straight Cliffs (Smoky Hollow Member) (39), Milk River (40), Judith River (41), and Hell Creek (42) faunas; absolute ages from ref. 16. (Bottom) Multituberculate size distribution, based on length of m1, from the same faunas except Trinity (data unavailable). Length of m1 based on sample mean, where available, and estimated by proportional relationships in a closely related species, where not directly represented.