The ancient beaches of Lake Agassiz are subtle features in the landscape, generally unnoticed except by persons specifically looking for them. I recognize some of the beaches when I cross them, but am too geologically ignorant to discern most of them. I do claim to know something about books, however. So I am embarrassed to confess how undiscerning I was on first reading Bill Redekop’s new book, Lake Agassiz: The Rise and Demise of the World’s Greatest Lake . I’ll resume my confession in a