Shows like Doctor Who and Quantum Leap are entirely based on the premise that they send their lead characters all throughout various points in time. Terra Nova isn't jumping all over the place, but instead just sends a handful of people 85 million years back, in some sort of alternate timeline, in order to save a few members of mankind. While they seemingly can't save the folks in our existence who can't see the sun, or breathe on their own or eat oranges or have more than two children without getting arrested, they do have a plan on saving humans as a race by sending them through a portal back 85 million years to create a new society. Or something. We're a little fuzzy on the details.