Dinosaurs:
* Iguanodon: Large, herbivorous dinosaurs with spiked thumbs and a powerful bite.
* Pterodactyl: Flying reptiles with wingspans up to 20 feet, used to transport characters through the plateau.
* Allosaurus: Large, predatory theropod dinosaurs, one of the main threats to the expedition.
* Stegosaurus: Herbivores with a distinctive plate-like structure on their backs.
* Ceratosaurus: Smaller, horned theropod dinosaurs that often preyed on smaller creatures.
* Triceratops: Herbivores with three horns on their heads, known for their defensive capabilities.
* Apatosaurus (Brontosaurus): Large, long-necked herbivores, often seen roaming in herds.
Other Prehistoric Creatures:
* Primitive Mammal: A small, nocturnal mammal resembling a rat or a shrew.
* Prehistoric Birds: Various bird species, including a large, predatory bird that preys on the smaller mammals.
* Giant Insects: The plateau is inhabited by massive ants and beetles.
Important Note: While the novel presents a fascinating array of prehistoric life, it's important to remember that it was written in 1912, before much of our modern understanding of paleontology. The depiction of these animals, their behavior, and their environment may not be scientifically accurate according to current knowledge.