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on years ago during the campanian stage of the late cretaceous period 47 48 during the late cretaceous period the site of the kaiparowits formation was located near the western shore of the western interior seaway a large inland sea that split north america into two landmasses laramidia to the west and appalachia to the east the plateau where dinosaurs lived was an ancient floodplain dominated by large channels and abundant wetland peat swamps ponds and lakes and was bordered by highlands the climate was wet and humid and supported an abundant and diverse range of organisms 49 this formation contains one of the best and most continuous records of late cretaceous terrestrial life in the world 50 gryposaurus monumentensis shared its paleoenvironment with other dinosaurs such as dromaeosaurid theropods the troodontid talos sampsoni ornithomimids like ornithomimus velox tyrannosaurids like albertosaurus and teratophoneus armored ankylosaurids the duckbilled hadrosaur parasaurolophus cyrtocristatus the ceratopsians utahceratops gettyi nasutoceratops titusi and kosmoceratops richardsoni and the oviraptorosaurian hagryphus giganteus 51 other paleofauna present in the kaiparowits formation included chondrichthyans sharks and rays frogs salamanders turtles lizards and crocodilians a variety of early mammals were present including multituberculates marsupials and insectivorans 52 see also edit timeline of hadrosaur research 2016 in paleontology references edit 1 2 creisler benjamin s 2007 deciphering duckbills in carpenter kenneth ed horns and beaks ceratopsian and ornithopod dinosaurs bloomington and indianapolis indiana university press pp 185 210 isbn 978 0 253 34817 3 1 2 3 4 glut donald f 1997 gryposaurus dinosaurs the encyclopedia jefferson north carolina mcfarland co pp 445 448 isbn 978 0 89950 917 4 1 2 lambe lawrence m 1914 on gryposaurus notabilis a new genus and species of trachodont dinosaur from the belly river formation of alberta with a description of the skull of chasmosaurus belli the ottawa naturalist 27 11 145 155 brown barnum 1910 the cretaceous ojo alamo beds of new mexico with description of the new dinosaur genus kritosaurus bulletin of the american museum of natural history 28 24 267 274 hdl 2246 1398 1 2 kirkland james i hernández rivera rené gates terry paul gregory s nesbitt sterling serrano brañas claudia inés garcia de la garza juan pablo 2006 large hadrosaurine dinosaurs from the latest campanian of coahuila mexico in lucas spencer g sullivan robert m eds late cretaceous vertebrates from the western interior new mexico museum of natural history and science bulletin 35 albuquerque new mexico new mexico museum of natural history and science pp 299 315 brown barnum 1914 cretaceous eocene correlation in new mexico wyoming montana alberta geological society of america bulletin 25 1 355 380 bibcode 1914gsab 25 355b doi 10 1130 gsab 25 355 archived from the original on 2022 12 12 retrieved 2019 09 12 gilmore charles w 1916 contributions to the geology and paleontology of san juan county new mexico 2 vertebrate faunas of the ojo alamo kirtland and fruitland formations united states geological survey professional paper 98 q 279 302 parks william a 1919 preliminary description of a new species of trachodont dinosaur of the genus kritosaurus kritosaurus incurvimanus transactions of the royal society of canada series 3 13 4 51 59 1 2 3 weishampel david b horner jack r 1990 hadrosauridae in weishampel david b dodson peter osmólska halszka eds the dinosauria 1st ed berkeley university of california press pp 534 561 isbn 978 0 520 06727 1 1 2 horner john r 1979 upper cretaceous dinosaurs from the bearpaw shale marine of south central montana with a checklist of upper cretaceous dinosaur remains from marine sediments in north america journal of paleontology 53 3 566 577 glut donald f 1982 the new dinosaur dictionary secaucus nj citadel press p 158 isbn 978 0 8065 0782 8 lambert david the diagram group 1983 a field guide to dinosaurs new york avon books p 161 isbn 978 0 380 83519 5 norman david b 1985 hadrosaurids i the illustrated encyclopedia of dinosaurs an original and compelling insight into life in the dinosaur kingdom new york crescent books pp 116 121 isbn 978 0 517 46890 6 prieto márquez alberto weishampel david b horner john r 2006 the dinosaur hadrosaurus foulkii from the campanian of the east coast of north america with a reevaluation of the genus pdf acta palaeontologica polonica 51 1 77 98 archived pdf from the original on 2020 10 22 retrieved 2008 10 02 lull richard swann wright nelda e 1942 hadrosaurian dinosaurs of north america geological society of america special paper 40 geological society of america p 21 1 2 3 4 5 horner john r 1992 cranial morphology of prosaurolophus ornithischia hadrosauridae with descriptions of two new hadrosaurid species and an evaluation of hadrosaurid phylogenetic relationships museum of the rockies occasional paper 2 1 119 1 2 gates terry a 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david d ed vertebrate paleontology in utah miscellaneous publication 99 1 salt lake city utah geological survey pp 345 353 isbn 978 1 55791 634 1 dinosaurs portal v t e ornithopoda kingdom animalia phylum chordata clade dinosauria clade ornithischia clade neornithischia clade cerapoda avemetatarsalia see avemetatarsalia ornithischia see ornithischia ornithopoda see below ornithopoda ornithopoda burianosaurus callovosaurus thescelosauridae hypsilophodontidae gideonmantellia hypsilophodon vectidromeus elasmaria anabisetia atlascopcosaurus chakisaurus diluvicursor fostoria galleonosaurus gasparinisaura isasicursor kangnasaurus leaellynasaura macrogryphosaurus mahuidacursor morrosaurus muttaburrasaurus notohypsilophodon qantassaurus sektensaurus talenkauen tietasaura trinisaura weewarrasaurus rhabdodontomorpha ampelognathus emiliasaura foskeia fostoria muttaburrasaurus obelignathus tenontosauridae convolosaurus iani tenontosaurus rhabdodontidae matheronodon mochlodon pareisactus rhabdodon transylvanosaurus zalmoxes dryomorpha draconyx hesperonyx owenodon dryosauridae dryosaurus dysalotosaurus elrhazosaurus eousdryosaurus iyuku kangnasaurus valdosaurus ankylopollexia barilium bayannurosaurus calvarius camptosaurus cedrorestes cumnoria dakotadon emiliasaura fukuisaurus hippodraco iguanacolossus istiorachis lanzhousaurus lurdusaurus magnamanus napaisaurus oblitosaurus osmakasaurus planicoxa proa ratchasimasaurus riabininohadros theiophytalia uteodon hadrosauriformes bolong hypselospinus jinzhousaurus mantellisaurus morelladon ouranosaurus iguanodontidae barilium comptonatus iguanodon mantellisaurus hadrosauroidea see below hadrosauroidea hadrosauroidea altirhinus bactrosaurus batyrosaurus brighstoneus cariocecus choyrodon claosaurus comptonatus datonglong eolambia equijubus fylax gilmoreosaurus gobihadros gongpoquansaurus gonkoken haolong huehuecanauhtlus hypsibema jeyawati jintasaurus koshisaurus levnesovia lophorhothon nanningosaurus nanyangosaurus penelopognathus plesiohadros portellsaurus probactrosaurus protohadros qianjiangsaurus shuangmiaosaurus siamodon sirindhorna tanius xuwulong yunganglong zhanghenglong zuoyunlong telmatosauridae kryptohadros telmatosaurus tethyshadros hadrosauridae aquilarhinus eotrachodon hadrosaurus lapampasaurus malefica yamatosaurus lambeosaurinae adynomosaurus ajnabia angulomastacator aralosaurus arenysaurus blasisaurus canardia jaxartosaurus kazaklambia latirhinus minqaria nipponosaurus pararhabdodon taleta tsintaosaurus parasaurolophini adelolophus charonosaurus parasaurolophus plesiolophus tlatolophus lambeosaurini amurosaurus corythosaurus hypacrosaurus lambeosaurus magnapaulia olorotitan velafrons saurolophinae barsboldia brachylophosaurini acristavus brachylophosaurus gongshuilong maiasaura ornatops probrachylophosaurus wulagasaurus austrokritosauria bonapartesaurus huallasaurus kelumapusaura secernosaurus kritosaurini ahshislesaurus anasazisaurus coahuilasaurus gryposaurus kritosaurus naashoibitosaurus rhinorex saurolophini augustynolophus prosaurolo...