This is a fascinating book because the story crosses so many disciplines: history, prehistory, archaeology, linguistics, and many different parts of geology. The authors, both geoscientists at Lamont-Doherty Earth Observatory of Columbia University, are most at home writing about their own fields. The clearest passages of Noah's Flood are those that describe the procedures of shipboard science that are used to collect data that Pitman and Ryan use to reconstruct the history of the Black Sea. The expositional passages that reconstruct the work of various historians, linguists, et al. are less consistently successful. And the parts of the book that describe the authors' own endeavors are the least readable because they solve the problem of being co-authors by describing each other in the third person, and they have a weakness for the Whig theory of history. That is, we are told about research that supports their story, but not about anything that refutes it.
Noah's Flood is a series of vignettes that amass circumstantial evidence for the claim that the global deluge found in the mythologies of so many Middle Eastern and Mediterranean peoples is actually a cultural memory of an early Holocene event. The basic premise that Ryan and Pitman set out to defend is that the legendary global flood is a historical event that took place 7,600 years ago north of Anatolia. The authors describe the basin of the Black Sea as a cradle of civilization, a place where agriculture may have originated, where some very sophisticated pottery was made, and human society was settled and somewhat complex. Basically, the flood ended a period of stable affluence and precipitated a long period of nomadic life, filled with warfare and hardship. Because it divided history in half this way, it was preserved as myth.
After the end of the last ice age, 20,000 year ago, the Black Sea basin began to fill with meltwater from the retreating ice sheets of northern Eurasia. The basin had been empty because of arid conditions during the ice age. The world's oceans, including the Mediterranean were much lower than at present, because so much of the world's water was frozen in the ice sheets. Post glacial warming was interrupted by two cooling events, the Younger Dryas from 12,900 to 11,700 BP and another event near 8,200 BP. The associated aridity in Europe, Asia and the Middle East drove early Modern human tribes into the Black Sea basin because it was a source of fresh water and food.
As the world's oceans, and therefore the Mediterranean, continue to rise in the post-glacial period, the salt water eventually overtopped debris that had collected in the Bosporus channel during the ice age and the ocean poured back into the Black Sea, displacing the fresh water lake that was there and the peoples who lived around it.
In a review in the New York Times shortly after the book's publication, Richard Ellis was more convinced by Pitman and Ryan's argument that the flood changed human history by displacing the Black Sea basin peoples, who then dispersed throughout Europe, Asia and the Middle East, carrying their advanced cultural practices with them. He was less convinced that this event had any link to the deluge myth. Furthermore, a decade ago research in the Black Sea delta of the Danube suggested that the level at 7,600 BP was only about 20 meters lower than the modern level, not 60 or 80 meters as Pitman and Ryan suggested. This would make for a much less catastrophic event, much less worthy of enshrining in folklore.
Regardless of the truth or falsity of the hypothesis, the book is just difficult to read because the prose has so many rough patches and the discursive storytelling requires trust that isn't earned. The Simon & Schuster editor is partly to blame. When authors use words incorrectly (e.g. "indigent" when they mean "indigenous") or tangle their syntax, the editor should sort it out. Also, some elements of the story are mentioned too often, like the baskets of rocks on ropes hung over the side of boats that allowed them to move northward in the Bosporus against the south-flowing surface current.
A synoptic history is related in Section IV in a chapter called "On a Golden Pond." The reader has been given the story a piece at time in the preceding 225 pages, which have included many, many tangential passages. So, it frustrating not to have been given this road map at the beginning of the book. If the authors wanted to structure this like a detective story, they should have copied the formula of Columbo and showed you the crime first and then let you watch a couple of scientists in rumpled raincoats figure it out.