WAcanthoceras (ammonite)WAcanthohoplitesWAguja FormationWAraripichthysWAxelrodichthysWBasilemysWBisbee GroupWCerro del Pueblo FormationWCoahuilaceratopsWCymatocerasWDouvilleicerasWEl Gallo FormationWExogyraWFagesiaWGaudrycerasWGeorgetown FormationWGoulmimichthysWHamulinaWHuehuecanauhtlusWLabocaniaWLaramide orogenyWLyellicerasWMagnapauliaWMammitesWMariellaWMauriciosaurusWMenuitesWMortonicerasWNeocomitesWOlmos FormationWPachydiscusWPeronicerasWPolyptychocerasWPuzosiaWScaphitesWSierra Madre FormationWSphenodiscusWTlayúa FormationWVascocerasWVelafronsWVeridagonWVinctiferWYehuecauhceratopsWZamites
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W