were so plentiful. Without the need for herbivores to migrate to find food, and theropods to migrate after herbivores, a whole ecosystem could evolve secluded from interbreeding. The theory also supported why the dinosaurs adorned such features like the 15 horns of Kosmoceratops, they were for sexual selection. Paleofauna Animals present include chondrichthyans (sharks and rays), gars, bowfin, sturgeons, frogs, salamanders, turtles, lizards, crocodilians (including Deinosuchus), coelurosaurian theropods such as dromaeosaurids, troodontids, and Ornithomimus velox, armored dinosaurs, the duckbill Parasaurolophus cyrtocristatus, and a variety of early mammals including multituberculates, marsupials, and insectivorans. Recent finds include large specimens of the duckbill Gryposaurus, including the species G. monumentensis, and the first described remains of the oviraptorosaurian Hagryphus giganteus. Trace fossils are also known from the Kaiparowits, including an excellently preserved hadrosaur skin impression known from a recent analysis by Herrero and Farke. Turtles Neosuchians Ornithischians Theropods See also List of dinosaur-bearing rock formations References Bibliography Geologic formations of Utah Upper Cretaceous Series of North America Cretaceous geology of Utah Mudstone formations Sandstone formations Fluvial deposits Paleontology in Utah Grand Staircase–Escalante National Monument