(2) A massive flood wiped out most life several thousand years ago
A summary of some of the points of evidence is here.
Your link leads to this statement (among others):
The correspondence between the global catastrophe in the geological record and the Flood described in Genesis is much too obvious for me not to conclude that these events must be one and the same.How does this statement reconcile archaeological sites in the western US which have pretty much continuous occupation during the 4,000-5,000 years ago time period during which most sources claim the flood occurred?
No time for flood and recovery, with global migration of plants, animals, and people. No evidence in DNA of descent from only eight individuals.
"How does this statement reconcile archaeological sites in the western US which have pretty much continuous occupation during the 4,000-5,000 years ago time period during which most sources claim the flood occurred?"
(1) How were those dates determined? It is possible that the dating methods are faulty.
(2) It is possible that Creationist timelines are faulty.
Neither of these invalidates the massive evidence for catastrophe throughout the paleozoic and mesozoic.
If you look at the flatness of the layers in the grand canyon, and then think about how there is supposed to be 100 million years of erosion between many of the layers, and then you look at the top of the canyon where there are eroded channels, it makes one think that perhaps there aren't so many years between the layers. Perhaps none at all.
Another interesting site to look at is Berthault's paleohydraulogy site: http://geology.ref.ac/berthault/
He showed that laminated sediments can be re-created in their original order in flowing water, thus showing that many laminations are the result of a physical sorting of particles, not a time sequence.
There are other paleohydraulic markers you can look at, many of which are outlined in Steve Austin's book about the Grand Canyon: http://baraminology.blogspot.com/2005/10/grand-canyon-monument-to-catastrophe.html