what are the time divisions of the geologic time scale
Geologic time scale
Precambrian Proterozoic Neoproterozoic Ediacaran Good fossils of the first multi-celled animals . Ediacaran biota flourish worldwide in seas . Simple trace fossils of possible worm - like Trichophycus , etc . First sponges and trilobitomorphs . Enigmatic forms include many soft - jellied creatures shaped like bags , disks , or quilts ( like Dickinsonia ) . Taconic Orogeny in North America . Aravalli Range orogeny in Indian Subcontinent . Beginning of Petermann Orogeny on Australian continent . Beardmore Orogeny in Antarctica , 633 -- 620 Ma . ~ 635
Precambrian Proterozoic Neoproterozoic Ediacaran Good fossils of the first multi-celled animals . Ediacaran biota flourish worldwide in seas . Simple trace fossils of possible worm - like Trichophycus , etc . First sponges and trilobitomorphs . Enigmatic forms include many soft - jellied creatures shaped like bags , disks , or quilts ( like Dickinsonia ) . Taconic Orogeny in North America . Aravalli Range orogeny in Indian Subcontinent . Beginning of Petermann Orogeny on Australian continent . Beardmore Orogeny in Antarctica , 633 -- 620 Ma . ~ 635