Cheetah
Deity
To validate a global flood around 4000 BCE?What evidence do you need?
Well, lets define the hypotheses first:
H0: Around 6000 BP the world was almost like today. With the Older Peron transgression the Neolithic Subpluvial came to an end, an intense aridification set in, and glaciers and ice caps melted a bit, so sea levels were about 4 meters higher than the 20th Century average.
H1: Around 6000 BP a sudden, global flood lasting roughly half a year ended up entirely covering all landmasses on the entire planet. The waters then receded and we ended up with sea levels at the same height as in H0.
Do correct me if my H1 hypothesis isn't accurate with what you would be arguing. And I assume we aren't including the Ark story for this?
Anyway, if the H1 hypothesis is accurate enough, we can proceed to list the facts we would need to validate it.
1.
The first thing that strikes me is: What happened to all the ice? If the planet was covered in water, what happened with all the glaciers and ice caps?
If they melted and became part of the water for the flood, then they would also have to freeze again afterwards. Of couse, in theory, a glacier could form where the old one left off, and continue to dig out the valley it was going through. That would be rather natural actually, considering that the same place was suitable to a glacier before the flood.
However, this would leave us with something of a conundrum: How could the massive glaciers and ice caps of today form within the span of just 6000 years? And why do they contain layers matching over a hundred thousand years of history? This (among oher problems) makes it rather doubtful that the glaciers could have completely melted and refrozen during the last 6000 years.
We're then left with the possibility that the glaciers and ice caps did not melt. But with water completely covering them, they would certainly have started to float!
This would suggest that one prediction we can make from H1 (and thus - if found - a fact to support H1) is this:
Massive ice in the form of glaciers and ice caps must have been floating around 6000 years ago. There should be glaciers and ice caps located in areas where they would be unnatural to form, and they probably also contain geological and biological traces which indicate that they formed in another place of the world.
2.
Where is all the water? The total water on planet Earth is currently about 1,386 million cubic kilometers. H1 would require a total of 4,500 million cubic kilometres of water. So another fact needed for H1 is the location of the missing water. I don't know of anywhere on the planet where this water could be stored, so I would then suggest that it is now off-planet! But for that to be the case, we would have to launch a whole new understanding of several sciences to explain how that amount of mass can naturally be removed from a planet without wrecking its existing ecosystem.
3.
Conversely, were was the water prior to the flood, and how come it suddenly converged into such a massive flood? Raising the sea level by 8,400 meters is quite unprecedented in geology.
We actually need a whole new hypothesis to explain this part, so while it is required to support H1, lets leave it for now.
4.
A half year global flood would have destroyed all land-based and flying animal life, and the vast majority of plant life as well. However, there is no evidence in biology that such a sudden and planet-wide extinction event happened. So, since we also have all this complex life around us today (including us humans!), including evidence of it existing for the last 6000 years, we are naturally forced to conclude that there was no extinction event.
However, that raises a new question: How did all the animals and plants survive? For a half-year long period, birds need places to land, many birds need land areas to hunt, all terrestrial animals need land to live on, and some of them need quite a lot. Plants also need land - and air - and they can not move around and most can not survive submersion for months at a time.
I have no idea on this one, but H1 needs another backup hypothesis to explain how animal and plant life survived a half-year long, planetwide flood.
So there you have it, I think. Those 4 points should cover the first major hurdles of making H1 an accepted, scientific theory. To sum up (tl;dr), the needed evidence to support H1 would be:
1. Glaciers and ice caps which have migrated randomly across the planet.
2. A complete new theory of how to get 3,100 trillion tons of mass of a planet without harming the existing ecosystem.
3. A new, verified hypothesis of where 3.1 billion cubic kilometers of water were hiding during the recent 4.6 billion years of this planets existence.
4. A new, verified hypothesis of how animal and plant life can survive a half-year long, global flood.
But since we're at it:
This seems like a rather peculiar and very extreme hypothesis. Which unexplained/badly explained facts led you to formulate it in the first place?