Since it refers to things directly associated with the "Earth", then I'd ASSUME that "the Adamic creation" which we live in would be the focus, and that any number of things may have taken place on the earth previously.
The Bible "hints" about things happening in the Spiritual kingdom BEFORE The "Adamic Creation" took place, but gives no detail. Since, in the Garden, satan was already an EVIL INFLUENCE, it would appear that his fall predated the Garden, and the words "Tohu", and "Bohu", ("Formless" and "Void") when appearing together always speak of desolation as the result of God's Judgement.
However, since God isn't inclined to present any details outside of the present creation, I'll ask about it later (If I even have to).