99.2 99.6L 99.9 0.02 0.08% 0.13 21.1 21.9% 22.7 200 0 km 200 Phanerozoic Eons Mesozoic Cenozoic Eras Cretaceous Paleogene Neogene Periods Upper PAL Eocene OLI Miocene Epochs Coniacian Santonian Campanian MAA Danian Selandian Thanetian Ypresian Lutetian Bartonian Priabonian Rupelian Chattian Aquitanian BUR Langhian Ages 15 19 23 26 30 34 38 41 45 49 53 56 60 64 67 71 75 79 82 86 MYA bald eagle Haliaeetus leucocephalus Versus Pandionidae Pandionidae Median Time: 46 MYA CI: (37.0 - 54.6 MYA) Due to conflicting time estimates between studies, ancestral nodes can be assigned younger ages than their descendants. A smoothing technique is used to adjust these times so the resulting tree is ultrametric.Adjusted Time: 46 MYA Kumar S, Stecher G, Suleski M, Hedges SB (2017). TimeTree: A Resource for Timelines, Timetrees, and Divergence Times. Mol Biol Evol 34:1812-1819citation (Median and adjusted times were derived from 17 studies)