Mammoth — Lou Cadle

A time gate... A team of fossil-hunters... A desperate fight to survive.... A rock slide at a fossil site uncovers a portal through time. Park Ranger Hannah and a team of fossil hunters are caught in it and whisked back to an era when giant predator mammals roamed the earth. Before they can find their way home, they must survive the Dawn of Mammals. In book 5, Hannah and the other survivors arrive in the ice world of the Pleistocene. With no other game to hunt, they must take on the mighty Mastodon and his wicked tusks. Can they survive the freeze long enough to jump back to modern times?