The Morrison Formation records an environment and time dominated by gigantic sauropod dinosaurs. Other dinosaurs known from the Morrison include the theropods "Koparion", "Stokesosaurus", "Ornitholestes", "Allosaurus", and "Torvosaurus"; the sauropods "Apatosaurus", "Brachiosaurus", "Camarasaurus", and "Diplodocus"; and the ornithischians "Camptosaurus", "Dryosaurus", "Othnielia", "Gargoyleosaurus", and "Stegosaurus". "Allosaurus", which accounted for 70 to 75% of all theropod specimens, was at the top trophic level of the Morrison food web. Other vertebrates that shared this paleoenvironment included ray-finned fishes, frogs, salamanders, turtles like "Dorsetochelys", sphenodonts, lizards, terrestrial and aquatic crocodylomorphans such as "Hoplosuchus", and several species of pterosaurs such as "Harpactognathus" and "Mesadactylus". Shells of bivalves and aquatic snails are also common. The flora of the period has been revealed by fossils of green algae, fungi, mosses, horsetails, cycads, ginkgoes, and several families of conifers. Vegetation varied from river-lining forests of tree ferns and ferns (gallery forests) to fern savannas with occasional trees such as the "Araucaria"-like conifer "Brachyphyllum".