A team of fossil-hunters... A gate through time... A desperate fight to survive. Park Ranger Hannah Kates is leading a group of gifted teens on a fossil-hunting field trip when a rock slide uncovers a portal through time. They get too close and are thrown back to an era when giant predator mammals roamed the earth. They need, desperately, to find their way home. But first, they have to survive a world where bizarre—and hungry—mammals ruled North America. They have to survive the Dawn of Mammals. In Book 1 of the series, Hannah, nine teens, and their teachers are thrown back thirty million years to the world of saber-toothed nimravids, ferocious carnivores. Will all of them be able to survive this vicious world of tooth and claw? Publisher's As with almost all SF and Fantasy, "series" means an ongoing story, like LOTR or a hundred thousand other series. Dawn of Mammals is a series is of five books