Very disappointed by this book.
Pro - excellent art, interesting history, some expanded info on the Camazotz, and detailing of the War of Dragons. The included chronicle looks like a fun romp through time to stop the ascension of Night-Master.
The War of Dragons gives good information about that previously undetailed time when Mokole ruled the world.
Con - Virtually no new crunch content, except for chapter 4 and 5, and that's just five rituals for the Camazotz and very bare info for making characters in the time of dinosaurs. This history book offers no useful content for most people. Unless a group chooses to set a campaign 30,000 years ago, this book will be of minimal value.
New enemies, gifts, rites, famed people of those eras as ancestors, or anything usable by a pack in the current day would have made this book much better.