If the flood happened as told in the Bible, it would not cause similar formations uniformly around the planet.
Floods are floods. Geologists are well aware what evidence floods leave behind.
Granted, the biblical flood was a magical one, so who knows....
For example in some areas it would expose "older" structures of the planet and in some areas it would cover them, which would make it look like there is different times and events.
You should stop before you embarass yourself even further. Someone here just informed you that he's a geologist with over 50 years of experience in the field.
You might want to shut up and learn a thing or two instead of pretending to know better when all you have is just mere belief in ancient mythology stolen from the even older Babylonians.
And the bottleneck, I think nature looks exactly what it would be after the flood. What do you think the bottleneck should look like?
And now, you are also exposing your extreme lack of knowledge concerning the basics of biology and genetic variation. Someone with a somewhat basic knowledge of these subject would not ask such stupid questions.
You might want to read up a bit before continuing this charade...
I can only repeat myself: there is no universal bottleneck in species dated to the same period. Or any other period for that matter.
The most recent bottleneck in humans for example, dates back to some 70.000 years ago and coincides with the toba volcano eruption, so presumably that was the cause of the severely reduced population size. It reduced human population to a few thousand individuals.
So even that bottleneck is a LOOOONG way from the "8 individuals" your mythology claims.
Also, and I add this as a funny FYI,... generally in biology a population of 200 is considered the bare minimum to have a viable population. Anything below that has a very high chance of going extinct due to the lack of genetic variation and inevitable inbreeding.
8 people, of which most are even closely related? Doomed to extinction. 0 chance of long-term survival. 0. Zero. Zilch. Nada.