(July 27, 2010 at 5:15 pm)Skeptisma Wrote: Even if this were possible, the "mixing" or "layering" didn't fully occur until the end of the rains. In any case, dolphins don't sit at the top of the waterline permanently. It is very easy to go through the fresh water, breathe, then back down into the salt water. So, they wouldn't ever be stewing in the fresh water, simply passing through. Kind of like how you take showers everyday?
You'll notice I mentioned the buoyancy issue as well. It is more difficult to swim in fresh water than it is in salt water.
Now, if the fresh water was actually at a depth that would allow fresh water aquatic species to survive, that's actually quite a depth for a sea-dweller to struggle through every time it needs to surface to breath. They would actually be 'stewing'. A dolphin can only stay submerged for 10 minutes, and while swimming breathe 2 or 3 times a minute. That's why dolphins tend to cruise near the surface.
The fact that salt-water air-breathers survived is one more flaw in the whole 'flood' idea.
Biology trumps religion.
