Beneath the farms, houses and forests of North America lie giant flood deposits. On top of them sits a layer of loess, which Randall attributes to a rain of mud. Everything we think of as the modern landscape rests on that sequence.
So what is actually under your feet? In his reading of the evidence, it is the remnants of the antediluvian world. And he points out that the same layering can be found all over the Earth.