Great website links, thanks!
What I mean is that Mammoth or elephant fossils (or any modern mammals for that matter) are never found in the same strata as dinosaur bones. If one were to speculate that the geological column was laid down as a flood event, then the fossils would be all mixed up. I've heard 'dinosaurs were slow moving so couldn't get to high ground quickly enough' argument, which doesn't really work if you consider that not all dinosaurs were large and slow.
There aren't any mammoths around trilobites, either.