Much as The Lost World by Doyle - Well written.
Great YA read.
If you grew up reading Jules Verne or Sir Arthur Conan Doyle, you're in for a treat.
Professor Challenger's Journey to the Center of the Earth of the pulp science fiction era is a direct precursor to this book. I think Greg Bear should have titled it Journey to the ENDS of the Earth, instead of 'THE CENTER of the Earth.'
And a teen-aged boy and his father go along on that fantastic journey! At one point the father tells the boy, "Sometimes it's best to look an adventure right in the eye and not back down, not even blink. Never let life see you're afraid."
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From back cover:
50 years after Professor Challenger's discovery of the Lost World, America's last dinosaur circus has gone bankrupt... leaving a dozen avisaurs, centrosaurs, ankylosaurs, and one large raptor abandoned.
Now a daring expedition plans to do the impossible: return the Jurassic giants to the wild.
Two filmmakers, a circus trainer, a journalist, and young Peer Belzoni must find a way to take the dinosaurs across oceans, continents, rivers, jungles, up a mountain that has been isolated for 70,000,000 years... and if they make it that far, all they'll have to do is face all the prehistoric wonders, dangers, and terrors of the Lost World.