<Li> Columbian Period--2060--1780 MYA--named after the supercontinent Columbia </Li> <Li> Mesoproterozoic Era--1780--850 MYA <Ul> <Li> Rodinian Period--1780--850 MYA--named after the supercontinent Rodinia, stable environment </Li> </Ul> </Li> <Ul> <Li> Rodinian Period--1780--850 MYA--named after the supercontinent Rodinia, stable environment </Li> </Ul> <Li> Rodinian Period--1780--850 MYA--named after the supercontinent Rodinia, stable environment </Li>

Which geologic time span covers the majority of earth's history