Which Lost World is it Based On? (((CONTAINS SPOILERS)))

Rating: 4/10 (19 May 2002)

((((((SPOILERS))))))
when I first saw this movie, I noticed that the opening scene was clearly form the first novel, Jurassic Park. Compies attack a girl on the beach. It started out obviously based on Crichton's novel, but as soon as the trailer goes over the cliff, It turns into Sir Arther Connan Doyle's the lost world. The good guy's and bad guys help each other (as opposed to the novel, where they fought till the end) and they even bring a dino to the shore. Was it based on Crichton's Lost World or Doyle's Lost World? which ever one it was, it's obvious David Koepp reads untill the middle and made the rest up.