Rapid appearance (~541–520 Ma) of nearly all extant animal phyla and body plans in ~20 My. Drivers hypothesised: oxygen rise, Ediacaran-predator innovation, Hox-gene toolkit, ecosystem engineering. Burgess Shale (505 Ma) key window.
Rapid appearance (~541–520 Ma) of nearly all extant animal phyla and body plans in ~20 My. Drivers hypothesised: oxygen rise, Ediacaran-predator innovation, Hox-gene toolkit, ecosystem engineering. Burgess Shale (505 Ma) key window.