{
  "schema": "omnisaura.snapshot/v2",
  "uid": "omnisaura:profile:pachycephalosaurus",
  "genus": "Pachycephalosaurus",
  "generated_at": "2026-10-12T10:16:43Z",
  "raw_run": "2026-10-12",
  "profile": {
    "name": {
      "value": "Pachycephalosaurus",
      "rule": "PBDB leads",
      "rule_id": "merge:lead_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "authority": {
      "value": "Brown and Schlaikjer 1943",
      "rule": "PBDB leads",
      "rule_id": "merge:lead_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "type_species": {
      "value": "Pachycephalosaurus wyomingensis",
      "rule": "PBDB leads",
      "rule_id": "merge:lead_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "order": {
      "value": "Ornithischia",
      "rule": "Gap filled from NHM",
      "rule_id": "merge:gap_fill_nhm",
      "synthesis": false,
      "sources": [
        {
          "source": "nhm",
          "license": "CC0-1.0"
        }
      ]
    },
    "family": {
      "value": null,
      "rule": null,
      "rule_id": null,
      "synthesis": false,
      "sources": []
    },
    "parent_name": {
      "value": "Eupachycephalosauria",
      "rule": "PBDB leads",
      "rule_id": "merge:lead_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "headline": {
      "value": [
        83.6,
        66.0,
        "Campanian",
        "Maastrichtian"
      ],
      "rule": "PBDB leads",
      "rule_id": "merge:lead_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "evidence": {
      "value": [
        83.6,
        66.0
      ],
      "rule": "Omnisaura synthesis: span of confirmed PBDB records",
      "rule_id": "merge:omnisaura_synthesis_confirmed_occurrences",
      "synthesis": true,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "countries": {
      "value": [
        "CA",
        "US"
      ],
      "rule": "Union of all sources (ISO 3166)",
      "rule_id": "merge:union_iso3166",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        },
        {
          "source": "nhm",
          "license": "CC0-1.0"
        }
      ]
    },
    "formations": {
      "value": [
        "Denver",
        "Dinosaur Park",
        "Ferris",
        "Hell Creek Formation",
        "Lance Formation"
      ],
      "rule": "Canonical names, automatic and editor-approved matches applied",
      "rule_id": "merge:canonical_formations",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        },
        {
          "source": "nhm",
          "license": "CC0-1.0"
        }
      ]
    },
    "common_names": {
      "value": [
        "ja:パキケファロサウルス",
        "zh:厚頭龍"
      ],
      "rule": "Wikidata leads",
      "rule_id": "merge:lead_wikidata",
      "synthesis": false,
      "sources": [
        {
          "source": "wikidata",
          "license": "CC0-1.0"
        }
      ]
    },
    "named_after": {
      "value": null,
      "rule": null,
      "rule_id": null,
      "synthesis": false,
      "sources": []
    }
  },
  "confidence": {
    "name": {
      "level": "high",
      "basis": "corroborated",
      "reasons": [
        "PBDB and Wikidata identify the same genus."
      ]
    },
    "authority": {
      "level": "high",
      "basis": "corroborated",
      "reasons": [
        "PBDB and Wikidata agree."
      ]
    },
    "type_species": {
      "level": "medium",
      "basis": "single_source",
      "reasons": [
        "Only PBDB gives this; nothing contradicts it."
      ],
      "source": "PBDB"
    },
    "parent_name": {
      "level": "medium",
      "basis": "single_source",
      "reasons": [
        "Only PBDB gives this; nothing contradicts it."
      ],
      "source": "PBDB"
    },
    "order": {
      "level": "medium",
      "basis": "single_source",
      "reasons": [
        "Only NHM gives this; nothing contradicts it."
      ],
      "source": "NHM"
    },
    "headline": {
      "level": "high",
      "basis": "corroborated",
      "reasons": [
        "PBDB and NHM agree."
      ]
    },
    "evidence": {
      "level": "medium",
      "basis": "synthesis",
      "reasons": [
        "Omnisaura's calculation from 31 confirmed PBDB records."
      ]
    },
    "common_names": {
      "level": "medium",
      "basis": "single_source",
      "reasons": [
        "Only Wikidata gives this; nothing contradicts it."
      ],
      "source": "Wikidata"
    },
    "countries": {
      "level": "mixed",
      "basis": "items",
      "reasons": [
        "Entries differ; see each entry."
      ],
      "items": [
        {
          "value": "CA",
          "level": "low",
          "basis": "thin",
          "reasons": [
            "Only one PBDB record."
          ]
        },
        {
          "value": "US",
          "level": "high",
          "basis": "corroborated",
          "reasons": [
            "NHM and PBDB both record it."
          ]
        }
      ]
    },
    "formations": {
      "level": "mixed",
      "basis": "items",
      "reasons": [
        "Entries differ; see each entry."
      ],
      "items": [
        {
          "value": "Denver",
          "level": "low",
          "basis": "thin",
          "reasons": [
            "Only one PBDB record."
          ]
        },
        {
          "value": "Dinosaur Park",
          "level": "low",
          "basis": "thin",
          "reasons": [
            "Only one PBDB record."
          ]
        },
        {
          "value": "Ferris",
          "level": "medium",
          "basis": "single_source",
          "reasons": [
            "Only PBDB records it (3 records)."
          ],
          "source": "PBDB"
        },
        {
          "value": "Hell Creek Formation",
          "level": "medium",
          "basis": "single_source",
          "reasons": [
            "Only PBDB records it (17 records)."
          ],
          "source": "PBDB"
        },
        {
          "value": "Lance Formation",
          "level": "high",
          "basis": "corroborated",
          "reasons": [
            "NHM and PBDB both record it."
          ]
        }
      ]
    }
  },
  "gaps": {
    "missing": [
      {
        "field": "family",
        "label": "Family",
        "note": "No source we use gives this yet."
      },
      {
        "field": "named_after",
        "label": "Named after",
        "note": "No source we use gives this yet."
      }
    ],
    "single_source": [
      {
        "field": "type_species",
        "label": "Type species",
        "source": "PBDB"
      },
      {
        "field": "parent_name",
        "label": "Parent group",
        "source": "PBDB"
      },
      {
        "field": "order",
        "label": "Order",
        "source": "NHM"
      },
      {
        "field": "common_names",
        "label": "Common names",
        "source": "Wikidata"
      }
    ],
    "disputed": [],
    "withheld": [
      {
        "records": "occurrences",
        "status": "tentative",
        "count": 3,
        "reason": "PBDB fossil records identified only tentatively (for example 'cf.' or '?')"
      }
    ]
  },
  "assessment": {
    "levels": {
      "high": "Two independent sources agree, or an editor has ruled.",
      "medium": "One source; nothing contradicts it.",
      "low": "Sources disagree and no editor has ruled yet, or too few records."
    },
    "by": "Omnisaura",
    "license_id": "OMNISAURA-EDITORIAL"
  },
  "formation_matches": [
    {
      "name": "Hell Creek",
      "same_as": "Hell Creek Formation",
      "status": "automatic",
      "ruling": null
    },
    {
      "name": "Lance",
      "same_as": "Lance Formation",
      "status": "automatic",
      "ruling": null
    }
  ],
  "credits": {
    "genus": "Pachycephalosaurus",
    "scope": "confirmed matches only",
    "data_sources": [
      {
        "values": 2566,
        "retrieved": [
          "2026-10-04",
          "2026-10-05",
          "2026-10-10",
          "2026-10-11"
        ],
        "source": "pbdb",
        "license_id": "CC-BY-4.0",
        "license_name": "Creative Commons Attribution 4.0",
        "license_url": "https://creativecommons.org/licenses/by/4.0/",
        "requires_attribution": true,
        "attribution": "Data from the Paleobiology Database (https://paleobiodb.org), licensed CC BY 4.0.",
        "source_name": "Paleobiology Database",
        "homepage": "https://paleobiodb.org"
      },
      {
        "values": 63,
        "retrieved": [
          "2026-10-04",
          "2026-10-05"
        ],
        "source": "nhm",
        "license_id": "CC0-1.0",
        "license_name": "Creative Commons Zero 1.0 (public domain dedication)",
        "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
        "requires_attribution": false,
        "attribution": "Natural History Museum (London) Data Portal, Collection specimens dataset, https://doi.org/10.5519/0002965. Image licenses vary per record.",
        "source_name": "Natural History Museum Data Portal",
        "homepage": "https://data.nhm.ac.uk"
      },
      {
        "values": 34,
        "retrieved": [
          "2026-10-05"
        ],
        "source": "wikidata",
        "license_id": "CC0-1.0",
        "license_name": "Creative Commons Zero 1.0 (public domain dedication)",
        "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
        "requires_attribution": false,
        "attribution": "Data from Wikidata (https://www.wikidata.org), CC0 1.0.",
        "source_name": "Wikidata",
        "homepage": "https://www.wikidata.org"
      }
    ],
    "images": [
      {
        "media_id": 903,
        "title": "File:Dracorex BW.jpg",
        "category": "Taxon image",
        "url": "https://upload.wikimedia.org/wikipedia/commons/6/6a/Dracorex_BW.jpg?utm_source=commons.wikimedia.org&utm_campaign=imageinfo&utm_content=original",
        "page_url": "https://commons.wikimedia.org/wiki/File:Dracorex_BW.jpg",
        "source": "commons",
        "rights_holder": "Nobu Tamura (http://spinops.blogspot.com)",
        "catalog_number": null,
        "license_id": "CC-BY-3.0",
        "license_name": "Creative Commons Attribution 3.0",
        "license_url": "https://creativecommons.org/licenses/by/3.0/",
        "requires_attribution": true,
        "share_alike": false,
        "attribution": "Nobu Tamura (http://spinops.blogspot.com) (Own work), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Dracorex_BW.jpg)"
      },
      {
        "media_id": 904,
        "title": "File:Pachycephalosaurus Reconstruction.jpg",
        "category": "Taxon image",
        "url": "https://upload.wikimedia.org/wikipedia/commons/b/bc/Pachycephalosaurus_Reconstruction.jpg?utm_source=commons.wikimedia.org&utm_campaign=imageinfo&utm_content=original",
        "page_url": "https://commons.wikimedia.org/wiki/File:Pachycephalosaurus_Reconstruction.jpg",
        "source": "commons",
        "rights_holder": "Fred Wierum",
        "catalog_number": null,
        "license_id": "CC-BY-4.0",
        "license_name": "Creative Commons Attribution 4.0",
        "license_url": "https://creativecommons.org/licenses/by/4.0/",
        "requires_attribution": true,
        "share_alike": false,
        "attribution": "Fred Wierum (Own work), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Pachycephalosaurus_Reconstruction.jpg)"
      },
      {
        "media_id": 905,
        "title": "File:Pachycephalosaurus RoyalOntarioMuseum.png",
        "category": "Taxon image",
        "url": "https://upload.wikimedia.org/wikipedia/commons/c/c0/Pachycephalosaurus_RoyalOntarioMuseum.png?utm_source=commons.wikimedia.org&utm_campaign=imageinfo&utm_content=original",
        "page_url": "https://commons.wikimedia.org/wiki/File:Pachycephalosaurus_RoyalOntarioMuseum.png",
        "source": "commons",
        "rights_holder": "Keith Schengili-Roberts",
        "catalog_number": null,
        "license_id": "CC-BY-SA-2.5",
        "license_name": "Creative Commons Attribution-ShareAlike 2.5",
        "license_url": "https://creativecommons.org/licenses/by-sa/2.5/",
        "requires_attribution": true,
        "share_alike": true,
        "attribution": "Keith Schengili-Roberts (Own Work (photo)), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Pachycephalosaurus_RoyalOntarioMuseum.png)"
      },
      {
        "media_id": 906,
        "title": "File:Pachycephalosaurus ontogeny skulls - Museum of the Rockies - 2013-07-08.jpg",
        "category": "Taxon image",
        "url": "https://upload.wikimedia.org/wikipedia/commons/4/44/Pachycephalosaurus_ontogeny_skulls_-_Museum_of_the_Rockies_-_2013-07-08.jpg?utm_source=commons.wikimedia.org&utm_campaign=imageinfo&utm_content=original",
        "page_url": "https://commons.wikimedia.org/wiki/File:Pachycephalosaurus_ontogeny_skulls_-_Museum_of_the_Rockies_-_2013-07-08.jpg",
        "source": "commons",
        "rights_holder": "Tim Evanson",
        "catalog_number": null,
        "license_id": "CC-BY-SA-2.0",
        "license_name": "Creative Commons Attribution-ShareAlike 2.0",
        "license_url": "https://creativecommons.org/licenses/by-sa/2.0/",
        "requires_attribution": true,
        "share_alike": true,
        "attribution": "Tim Evanson (https://www.flickr.com/photos/23165290@N00/9329893746/), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Pachycephalosaurus_ontogeny_skulls_-_Museum_of_the_Rockies_-_2013-07-08.jpg)"
      },
      {
        "media_id": 907,
        "title": "File:Pachycephalosaurus skull.JPG",
        "category": "Taxon image",
        "url": "https://upload.wikimedia.org/wikipedia/commons/6/6c/Pachycephalosaurus_skull.JPG?utm_source=commons.wikimedia.org&utm_campaign=imageinfo&utm_content=original",
        "page_url": "https://commons.wikimedia.org/wiki/File:Pachycephalosaurus_skull.JPG",
        "source": "commons",
        "rights_holder": "Credit to - user Ballista from the English wikipedia.",
        "catalog_number": null,
        "license_id": "CC-BY-SA-3.0",
        "license_name": "Creative Commons Attribution-ShareAlike 3.0",
        "license_url": "https://creativecommons.org/licenses/by-sa/3.0/",
        "requires_attribution": true,
        "share_alike": true,
        "attribution": "Credit to - user Ballista from the English wikipedia. (Own work), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Pachycephalosaurus_skull.JPG)"
      },
      {
        "media_id": 908,
        "title": "File:The Childrens Museum of Indianapolis - Dracorex skeletal reconstruction.jpg",
        "category": "Taxon image",
        "url": "https://upload.wikimedia.org/wikipedia/commons/4/43/The_Childrens_Museum_of_Indianapolis_-_Dracorex_skeletal_reconstruction.jpg?utm_source=commons.wikimedia.org&utm_campaign=imageinfo&utm_content=original",
        "page_url": "https://commons.wikimedia.org/wiki/File:The_Childrens_Museum_of_Indianapolis_-_Dracorex_skeletal_reconstruction.jpg",
        "source": "commons",
        "rights_holder": "Unknown author",
        "catalog_number": null,
        "license_id": "CC-BY-SA-3.0",
        "license_name": "Creative Commons Attribution-ShareAlike 3.0",
        "license_url": "https://creativecommons.org/licenses/by-sa/3.0/",
        "requires_attribution": true,
        "share_alike": true,
        "attribution": "Unknown author (The Children's Museum of Indianapolis), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:The_Childrens_Museum_of_Indianapolis_-_Dracorex_skeletal_reconstruction.jpg)"
      },
      {
        "media_id": 901,
        "title": "NHM-UK_P_DF118_03_24_0413",
        "category": "Register",
        "url": "https://data.nhm.ac.uk/media/7af4cdd3-44f0-4103-9f02-6d05760ea5ca",
        "page_url": null,
        "source": "nhm",
        "rights_holder": "The Trustees of the Natural History Museum, London",
        "catalog_number": "PV R 10053",
        "license_id": "CC-BY-4.0",
        "license_name": "Creative Commons Attribution 4.0",
        "license_url": "https://creativecommons.org/licenses/by/4.0/",
        "requires_attribution": true,
        "share_alike": false,
        "attribution": "The Trustees of the Natural History Museum, London; via NHM Data Portal (https://data.nhm.ac.uk/media/7af4cdd3-44f0-4103-9f02-6d05760ea5ca)"
      },
      {
        "media_id": 902,
        "title": "NHM-UK_P_DF118_03_24_0193",
        "category": "Register",
        "url": "https://data.nhm.ac.uk/media/0b7f7c7f-9e7f-4321-b015-cac1f1d4d8d6",
        "page_url": null,
        "source": "nhm",
        "rights_holder": "The Trustees of the Natural History Museum, London",
        "catalog_number": "PV R 8398",
        "license_id": "CC-BY-4.0",
        "license_name": "Creative Commons Attribution 4.0",
        "license_url": "https://creativecommons.org/licenses/by/4.0/",
        "requires_attribution": true,
        "share_alike": false,
        "attribution": "The Trustees of the Natural History Museum, London; via NHM Data Portal (https://data.nhm.ac.uk/media/0b7f7c7f-9e7f-4321-b015-cac1f1d4d8d6)"
      }
    ],
    "derived_ages": {
      "specimens": 1,
      "ics_version": "v2024/12"
    },
    "references": 91
  },
  "credits_markdown": "## Pachycephalosaurus: Sources & credits\n\n_Scope: confirmed matches only._\n\n### Data\n- **Paleobiology Database** (https://paleobiodb.org): [Creative Commons Attribution 4.0](https://creativecommons.org/licenses/by/4.0/). Data from the Paleobiology Database (https://paleobiodb.org), licensed CC BY 4.0. Retrieved 4 October 2026, 5 October 2026, 10 October 2026, 11 October 2026.\n- **Natural History Museum Data Portal** (https://data.nhm.ac.uk): [Creative Commons Zero 1.0 (public domain dedication)](https://creativecommons.org/publicdomain/zero/1.0/). Natural History Museum (London) Data Portal, Collection specimens dataset, https://doi.org/10.5519/0002965. Image licenses vary per record. Retrieved 4 October 2026, 5 October 2026. _Credited as a courtesy: this licence doesn't require attribution._\n- **Wikidata** (https://www.wikidata.org): [Creative Commons Zero 1.0 (public domain dedication)](https://creativecommons.org/publicdomain/zero/1.0/). Data from Wikidata (https://www.wikidata.org), CC0 1.0. Retrieved 5 October 2026. _Credited as a courtesy: this licence doesn't require attribution._\n\nAges for 1 specimen(s) were derived from their stage names using the ICS International Chronostratigraphic Chart v2024/12 (International Commission on Stratigraphy), via the Paleobiology Database (CC BY 4.0).\n\n### Images (8)\n- “File:Dracorex BW.jpg” (Taxon image): Nobu Tamura (http://spinops.blogspot.com) (Own work), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Dracorex_BW.jpg). [Creative Commons Attribution 3.0](https://creativecommons.org/licenses/by/3.0/).\n- “File:Pachycephalosaurus Reconstruction.jpg” (Taxon image): Fred Wierum (Own work), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Pachycephalosaurus_Reconstruction.jpg). [Creative Commons Attribution 4.0](https://creativecommons.org/licenses/by/4.0/).\n- “File:Pachycephalosaurus RoyalOntarioMuseum.png” (Taxon image): Keith Schengili-Roberts (Own Work (photo)), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Pachycephalosaurus_RoyalOntarioMuseum.png). [Creative Commons Attribution-ShareAlike 2.5](https://creativecommons.org/licenses/by-sa/2.5/). Shown unmodified (share-alike licence).\n- “File:Pachycephalosaurus ontogeny skulls - Museum of the Rockies - 2013-07-08.jpg” (Taxon image): Tim Evanson (https://www.flickr.com/photos/23165290@N00/9329893746/), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Pachycephalosaurus_ontogeny_skulls_-_Museum_of_the_Rockies_-_2013-07-08.jpg). [Creative Commons Attribution-ShareAlike 2.0](https://creativecommons.org/licenses/by-sa/2.0/). Shown unmodified (share-alike licence).\n- “File:Pachycephalosaurus skull.JPG” (Taxon image): Credit to - user Ballista from the English wikipedia. (Own work), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Pachycephalosaurus_skull.JPG). [Creative Commons Attribution-ShareAlike 3.0](https://creativecommons.org/licenses/by-sa/3.0/). Shown unmodified (share-alike licence).\n- “File:The Childrens Museum of Indianapolis - Dracorex skeletal reconstruction.jpg” (Taxon image): Unknown author (The Children's Museum of Indianapolis), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:The_Childrens_Museum_of_Indianapolis_-_Dracorex_skeletal_reconstruction.jpg). [Creative Commons Attribution-ShareAlike 3.0](https://creativecommons.org/licenses/by-sa/3.0/). Shown unmodified (share-alike licence).\n- “NHM-UK_P_DF118_03_24_0413” (specimen PV R 10053): The Trustees of the Natural History Museum, London; via NHM Data Portal (https://data.nhm.ac.uk/media/7af4cdd3-44f0-4103-9f02-6d05760ea5ca). [Creative Commons Attribution 4.0](https://creativecommons.org/licenses/by/4.0/).\n- “NHM-UK_P_DF118_03_24_0193” (specimen PV R 8398): The Trustees of the Natural History Museum, London; via NHM Data Portal (https://data.nhm.ac.uk/media/0b7f7c7f-9e7f-4321-b015-cac1f1d4d8d6). [Creative Commons Attribution 4.0](https://creativecommons.org/licenses/by/4.0/).\n\n### Scientific references\n\n91 published reference(s) support this entry (via the Paleobiology Database).\n",
  "notice": "Omnisaura data combines sources under different licences. Every genus file lists its credits; anyone showing a value must show the credits for it. Images keep their own licences; share-alike images may only be shown unmodified.",
  "fossil_basis": "body",
  "original_description": {
    "citation": "B. Brown, E. M. Schlaikjer (1943). A study of the troödont dinosaurs with the description of a new genus and four new species. Bulletin of the American Museum of Natural History 82(5): 115–150.",
    "authors": "B. Brown, E. M. Schlaikjer",
    "year": 1943,
    "title": "A study of the troödont dinosaurs with the description of a new genus and four new species",
    "publication": "Bulletin of the American Museum of Natural History",
    "volume": "82",
    "issue": "5",
    "pages": "115–150",
    "doi": null,
    "url": null,
    "what": "The publication the Paleobiology Database gives as the authority for this genus name, usually the one that first named and described it.",
    "confidence": {
      "level": "high",
      "reasons": [
        "PBDB gives this publication for the name; its author and year match the naming authority (Brown and Schlaikjer 1943), on which PBDB and Wikidata agree."
      ]
    },
    "source": "pbdb",
    "source_name": "Paleobiology Database",
    "license_id": "CC-BY-4.0",
    "pbdb_reference_no": "12773"
  },
  "summary": "Omnisaura summary: Pachycephalosaurus, Brown and Schlaikjer 1943\n\n- Named by: Brown and Schlaikjer 1943 (high confidence: PBDB and Wikidata agree).\n- Order: Ornithischia (medium confidence: only NHM gives this; nothing contradicts it).\n- Parent group: Eupachycephalosauria (medium confidence: only PBDB gives this; nothing contradicts it).\n- Type species: Pachycephalosaurus wyomingensis (medium confidence: only PBDB gives this; nothing contradicts it).\n- Age, as published by the Paleobiology Database: Campanian to Maastrichtian, 83.6–66 million years ago (high confidence: PBDB and NHM agree).\n- Age, Omnisaura's own calculation (not a published figure): 83.6–66 million years ago (medium confidence: Omnisaura's calculation from 31 confirmed PBDB records).\n- Fossils found in: United States (high: NHM and PBDB both record it); Canada (low: only one PBDB record).\n- Rock formations: Lance Formation (high: NHM and PBDB both record it); Ferris (medium: only PBDB records it (3 records)); Hell Creek Formation (medium: only PBDB records it (17 records)); Denver (low: only one PBDB record); Dinosaur Park (low: only one PBDB record).\n- Original description: B. Brown, E. M. Schlaikjer (1943). A study of the troödont dinosaurs with the description of a new genus and four new species. Bulletin of the American Museum of Natural History 82(5): 115–150. (high confidence: PBDB gives this publication for the name; its author and year match the naming authority (Brown and Schlaikjer 1943), on which PBDB and Wikidata agree).\n- Common names: パキケファロサウルス, 厚頭龍 (medium confidence: only Wikidata gives this; nothing contradicts it).\n\nNot known or disputed:\n- Family: no source Omnisaura uses gives this.\n- Named after: no source Omnisaura uses gives this.\n- 3 fossil record(s) left out because their identification is uncertain.\n\nNot covered by Omnisaura: diet, size, weight, appearance or behaviour. Do not fill these in from general knowledge as if they came from Omnisaura.\n\nCredits (must be shown with any of this): Natural History Museum Data Portal (CC0-1.0); Paleobiology Database (CC-BY-4.0); Wikidata (CC0-1.0)."
}