Create an image of a square or rectangular vanilla cake designed to serve 30 people, with a dinosaur theme. The cake should have smooth buttercream frosting with vibrant green and brown tones to represent a prehistoric landscape. The design should include a variety of dinosaurs, trees, and rocks, all made from edible fondant or buttercream. A large dinosaur figurine should be the focal point, placed at the center, with smaller dinosaurs and volcano elements around the edges. The cake should balance fun and creativity, appealing to both children and adults.