| Marginocephalians Fossil range: Jurassic-Cretaceous |
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 Skull of Triceratops. The Jurassic is a geologic period and system that extends from about Ma (million years ago to Ma that is from the end of the Triassic to the beginning The Cretaceous (kriːˈteɪʃəs, usually abbreviated 'K' for its German translation "Kreide" is a geologic period and system, reaching from the end of Triceratops (traɪˈsɛrətɒps is an extinct Genus of herbivorous ceratopsid Dinosaur which lived during the late Maastrichtian
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Marginocephalia ("fringed heads") is a clade of ornithischian dinosaurs that includes the thick-skulled pachycephalosaurids, and horned ceratopsians. Chordates ( Phylum Chordata) are a group of Animals that includes the Vertebrates together with several closely related Invertebrates Reptiles, or members of the class Reptilia are air-breathing Cold-blooded Vertebrates that have skin covered in scales as opposed to hair or feathers Ornithischia (ɔrnɪˈθɪskiə) or Predentata is an extinct order of beaked herbivorous Dinosaurs The name ornithischia Cerapoda (siːˈrɒpədə is a Clade or suborder of the order Ornithischia. Paul Callistus Sereno (born October 11 1957) is an American paleontologist who is the discoverer of several new Dinosaur species on Ceratopsia or Ceratopia (ˌsɛrəˈtɒpsiə/ /ˌsɛrəˈtoʊpiə Greek: "horned faces" is a group of herbivorous, beaked Dinosaurs Pachycephalosauria (ˌpækɨˌsɛfələˈsɔriə Greek for 'thick headed lizards' is a Clade of Ornithischian Dinosaurs Well-known genera A clade is a taxonomic group comprising a single Common ancestor and all the descendants of that ancestor Ornithischia (ɔrnɪˈθɪskiə) or Predentata is an extinct order of beaked herbivorous Dinosaurs The name ornithischia Pachycephalosauria (ˌpækɨˌsɛfələˈsɔriə Greek for 'thick headed lizards' is a Clade of Ornithischian Dinosaurs Well-known genera Ceratopsia or Ceratopia (ˌsɛrəˈtɒpsiə/ /ˌsɛrəˈtoʊpiə Greek: "horned faces" is a group of herbivorous, beaked Dinosaurs They were all herbivores, walking on two or four legs, and are characterized by a bony ridge or frill the back of the skull. Herbivory is a form of Predation in which an Organism, known as a herbivore, consumes principally Autotrophs ref name=Campbell>Campbell The clade evolved in the Jurassic period, and became common in the Upper Cretaceous. The Jurassic is a geologic period and system that extends from about Ma (million years ago to Ma that is from the end of the Triassic to the beginning The Cretaceous (kriːˈteɪʃəs, usually abbreviated 'K' for its German translation "Kreide" is a geologic period and system, reaching from the end of
Phylogeny
Heterodontosauriformes |--Heterodontosauridae `-- Marginocephalia |--Pachycephalosauria `--Ceratopsia
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