I've always thought that if there was some kind of world-wide liquification, there would have been signs of a massive extinction rate of some kind at the time. Animals and plants are strong, yes, but many, many species of plants, for example, would die off, I think? All at once?
Anyway, last time I saw something to do with Liquification, it was something to do with the ground shaking, which makes the ground liquify momentarily and then solidify again, a little like snow does in an avalanche, or the way wet sand sucks your feet down if you jump up and down on the beach. If this were true, wouldnt that require some kind of world-wide shake-up. A global earthquake. A meteor. A HUGE meteor. Quite possibly one that would have just as easily went straight through the planet, nevermind cause worldwide liquification. I, honestly, can't think of any physical force that would make a global earthquake of that calibre. Unless someone can think of something, I really cant think of any way that worldwide liquification would in any way be possible.
Not only that, but if I'm right about all of that, and Liquification is half of what its made out to be, it would have completely decimated areas it affects, and there would, surely, be noone left to tell the tale, or have seen it?
... And if anyone wants to get into the religious/spiritual side of things, I doubt an Ark would float on liquificated form. xD It'd wiggle like crazy, wouldnt it? I feel a lot of old tales of immense destruction on certain civilisations are either 'garnished' legends that pre-historical people told eachother, or were based from actual natural events that CAN be explained, but just, again, with a little bit of garnish added. Fire and brimstone. All that stuff. And~ I actually think, if you look back on the history of the entire world, the Earth floated through space dead for a heckuva long time, before life EVER came to appear on it. Which I thought a little weird.
Well as that... I was just thinking.. liquification.. I always thought that affected only materials that were in small granules that could be seperated. (Ie; mud, sand, snow, gravel.) I've never actually heard of solid rock liquidating. Solid rock being what most fossils are actually set in. Fossils having basically turned into solid rock for all intensive purposes. Wouldnt perhaps fossils break up, if at ALL the area around them liquidated?
I'm not a big expert on this area, but thought I'd just throw some stuff in.
Remember, people tended to believe in a lot of things that weren't particularly real back in the ancient times.