Jurassic Marsh is the 14th world in Plants vs. Zombies 2. This world takes place during the Jurassic Era, long before the events of Frostbite Caves, where dinosaurs were still alive. Although the lawn is located in a marsh, water is not a relevant environment modifier in this world. However, water can be seen near the lawn. All the plants obtained in this world except for Perfume-shroom are "primal" versions of the Player's House plants. Dinosaurs are the gimmick and environmental modifier of this world. They do not act like typical zombies and are not classified as such since there is no such interaction between the dinosaurs and plants (except between Perfume-shroom). They, however, do interact with zombies of any type that passes by them. The dinosaurs are the raptor, Stegosaurus, pterodactyl, T. rex, and Ankylosaurus.
The Zombies that you can see in this world (My Take): Jurassic Zombie Jurassic Conehead Jurassic Buckethead Jurassic Fossilhead Amberhead Zombie Jurassic Flag Zombie Jurassic Rally Zombie Jurassic Imp Jurassic Gargantuar Jurassic Bully Egg Stealer Imp Eggshell Imp Zombot Dinotronic Mechasaur