The first Biblical record of a worldwide flood is in Genesis 1:2. The actual events that brought about the flood are between verse one and two and are unrecorded. There’s a gap between verse one and two.
There are references throughout the Bible to what went on in that period and I believe this is the period when Satan fell and dinosaurs roamed the earth. But there’s no chronological record in the Bible of what happened between verse one and two.
We don’t know how long that period was, but science records it 4.5 billion years from the creation of the earth in verse one. Many Christians have long been confused about this which is why there’s some confusion among some Christians who challenge science as to the age of the earth.
The only definitive Biblical record of this period is the effects recorded in verse two. What follows verse two is actually God’s RE-creation.
The second Biblical record of a worldwide flood was of course Noah’s flood in Genesis 7 & 8 after which God promised he would never again flood the earth.
Pretty cool theory. I will have to spend some quality time contemplating that.
I have a running theory that Adams age did not chronologically begin until after the fall. As he and Eve were designed to last, there would be no need for aging either of them. My theory gives viability to the rise of humanity in Eden as when Cain left the family, he was concerned that he would be killed by whomever found him (Genesis 4:14), this is a clear indication that there were other people on the planet at the time. The Bible also indicates that Eve’s punishment is an increase in pain at childbirth. The Hebrew “rabah” means to increase or multiply, meaning pain had to exist in order to increase. An implication that she had given birth previously.
Cain went East and found a wife, obviously this had to be a sister, and he built a city (Genesis 4:16-17). Would have been a rather empty city without inhabitants. I believe that Adam and Eve resided in the Garden for quite some time prior to the fall.