I found the premise interesting but quit watching after the 3rd episode, falling into the tar pit and going back to 10,000 BC is interesting but not enough for me to watch beyond that. It isn't a very exciting show and sort of plods along.
The show isn't that bad. But it isn't that good either. In a really good show you quickly forget you are seeing actors because the dialog is so well written. In this show the dialog is often laughable and the acting inconsistent. I was mainly curious to see how they explain the falling into what amounts to unexplained time travel backwards but if they did it was after I gave up on it..
For any who may not know this show is named for the actual, factual La Brea tar pits in Los Angeles. Tar pits where a large number of ancient fossils have been discovered. So this fictional show bridges off that, and the idea that a sinkhole might open up and people might be transported to an ancient time.
Update February 2024: Tonight is being touted as the final episode when they return home. I am watching it to see how the wrap it up. Frankly I am amazed that it lasted as long as it did. The dialog didn't improve over the years.