Um... did you say billion? You want to go back to the interface between the Hadean and Eoarchean periods? At least you waited until the Earth started to have a

Um... did you say billion? You want to go back to the interface between the Hadean and Eoarchean periods? At least you waited until the Earth started to have a solid, rather than molten crust. Maybe you’d like to set a date after the emergence of atmospheric O2?