e ancestors of humans appear
             major radiation of mammals, birds, and pollinating insects
             Cretaceous 144 Flowering plants appear; dinosaurs and many groups of organisms become instinct at end of period
             Jurassic 208 Gymnosperms continue as dominant plants;
             Triassic 245 Gymnosperms dominate landscapes;
             Permian 286 Radiation of reptiles; origins of mammal-like
             reptiles and most modern orders of insects
             ...