Hilarious!
This book is so bad it's almost good. You have to find pseudo-science entertaining, but if you do, this one delivers the goods. Starting with advice (p. 9-10) about how to think in a way that makes their book more plausible (hint: it's not to think rationally or in a linear fashion, since if you do, their whole premise will fall apart!), the authors quickly move on to the hilarious straw-man argument that archaeology is somehow focused only on "history," and not "pre-history," which is then seen as a blank page needing to be filled (p. 12).
And that's just the beginning! This book is only the opening salvo, their next book apparently suggests that people from the future built the moon, which is one of the most ridiculous ideas ever concocted.
One of the most strikingly clumsy bits comes when they wrestle with the problem of the supposedly most ancient units of measure being "earth commensurate" (p. 29). The authors see the problem, that there would have to have been an unknown, already fully established measuring system in place for the creation of new"earth commensurate" units (for which there is absolutely no evidence), and yet declare "After some thought we realized that this was not a problem at all." No? It isn't a problem to explain the unknown origins of linear measurement by doubling the size of the problem? Now we need to fill two blanks instead one!
The only way this could be funnier would be if it wasn't taken seriously by anyone, which is unfortunately not the case. Nowhere near as brilliantly bad as Velikovsky's "Worlds in Collision," but still a terrific entertainment value if you can find it cheap.