Cambrian explosion
Ediacaran biota bear little resemblance to modern lifeforms, and their relationship even with the immediately following lifeforms of the Cambrian explosion is rather difficult to interpret. More than 100 genera have been described, and well known forms include "Arkarua", "Charnia", "Dickinsonia", "Ediacaria", "Marywadea", "Cephalonega", "Pteridinium", and "Yorgia".