FIG. 5 in Pennaraptoran Theropod Dinosaurs Past Progress And New Frontiers

FIG. 5. The influence of body size on estimates of crown bird and neoavian clade ages from strict clock analyses (modified from Berv and Field, 2018). A, Results of body size partitioning on estimates of the age of the crown bird MRCA. The "heavy" body size partition (blue) yields a mean crown bird MRCA estimate ~17 million years younger than the "medium" body size partition, and ~38 million years younger than the "light" body size partition (pink). B, Results of body size partitioning on estimates of the age of the neoavian MRCA. "Heavy" body size partition yielded a neoavian MRCA estimate of ~46 Ma (blue), "medium" body size partition ~63 Ma (grey), "light" body size partition ~68 Ma (pink). Dashed red line corresponds to the K–Pg boundary.