I've seen some of the episodes of the dinotopia tv series, but not many. The stone thing I heard about. Not surprised since I think in the books it's mentioned a dino, forgot his name, did leave dinotopia and retired in ancient egypt. & the dinos, whooly mammoths did get to dinotopia so there has to be a passage in the world beneath, or maybe there was one and it was closed off due to earthquakes, volcanos, plates shifting, ect.