I'm looking for a cartoon, probably feature movie. I remember there was a family and they were driving in a car. They stopped somewhere, the children got out and went towards a cave. At the end of the cave there was a small passage and they ended up in a land where dinosaurs lived. The cartoon was probably from the 1990s. When they entered the cave, the first dinosaur to appear was the one with the long herbivore neck, I think they befriended it and slid down its neck.