Field guide · Locality evidence · 10 October 2026

The mamenchisaurid branch

The earlier 19-member outcome came from blank geological-group metadata. It does not establish a shared Daye assemblage. Explicitly naming the unit and Tibet/Xizang lets the clue use known geography without inventing missing group assignments.

The scoped clues

Target	Explicit clue	Earlier maximum	New maximum
Damalasaurus	Tibet / Xizang · China	34	2
Microdontosaurus	Tibet / Xizang · China	34	2
Damalasaurus	Daye Group · Tibet / Xizang · China	34	1
Microdontosaurus	Chaya Group · Tibet / Xizang · China	34	1

1224 reaching guesses checked. All three provisional standard clues and each wrong guess apply. Every non-primary or qualified occurrence contributes; missing evidence remains possible wherever it could match.

What we decided

Prefer Tibet/Xizang, China as the first locality support for these two targets: it narrows the reviewed comparison without immediately naming a unique unit. If a unit is displayed, include Tibet/Xizang explicitly. A blank group field on a recorded fossil elsewhere does not make its geographical origin unknown.
Correct the earlier explanation: Microdontosaurus uses Chaya Group, not Daye Group. The place name Daye in its collection label must not be converted into a geological-group match.
Attach sourced geography to 12 existing literature-summary rows in this review overlay. All raw occurrences, qualified referrals and supported horizon alternatives remain available; no parent-group memberships are invented.
Keep the country-only assessment as a checkpoint. This follow-up supersedes its two target comparisons with explicit provincial support and also tests finer unit + province wording; no discovery-date clue is required for these count results.
Retain all 19 genera as legal source guesses under the existing roster policy. This locality review does not approve additional hidden answers or resolve contested genus identities.

Historical unit names and remaining uncertainties

Daye is a historical Jurassic locality/unit name in Qamdo, eastern Tibet. McPhee2016 uses Daye Group/Duogaila member; Wei2023 uses Daye Formation for the historical material. Preserve these different rank usages rather than silently renaming the frozen specimen horizon.
Modern Qamdo schemes are not a verified specimen-level crosswalk for Damalasaurus or Microdontosaurus. Do not equate Daye, Chaya, Dabuka/Dapuka or Dongdaqiao across every record merely because their terminology overlaps.
Microdontosaurus record1252925 explicitly has Chaya group, with formerly Dabuka Formation in comments and Daye as part of the locality name. Original Zhao1985 naming account remains unread.
The geographical clue is supported at Tibet/Xizang level. No unsupported finer quarry or constituent formation is required to resolve this comparison.
Xinjiangtitan retains Qiketai/Qigu alternatives from competing primary accounts. Qijianglong retains Suining/Upper Shaximiao alternatives; the later remapping is explicitly unpublished. Neither conflict moves those specimens to Tibet.
Zigongosaurus has no captured genus-linked occurrence. A primary historical Wujiaba/Sichuan locality account resolves geography of its existing literature summary, but its identity and standard clues remain unapproved.
Omeisaurus preserves all thirteen captured records. The type row combines Shaximiao Formation with Daanzhai member; that potential horizon inconsistency needs a separate specimen-level review. Its Gansu blank-horizon and qualified Guangyuan records remain intact.

All 19 genera

Open a genus to inspect every captured occurrence and the reviewed comparison rows. The source dossiers record literature evidence, access gaps and specimen-level uncertainties.

Analong · 1 captured occurrence(s)

Recorded provinces: Yunnan.

Own reviewed supported locality result: 3 or fewer after locality and useful navigation.

[
  {
    "genusId": "414475",
    "genus": "Analong",
    "occurrenceId": "1499899",
    "collectionId": "70438",
    "identifiedName": "Analong chuanjieensis n. gen. n. sp.",
    "acceptedName": "Analong chuanjieensis",
    "qualified": false,
    "occurrenceReferenceId": "72051",
    "collectionReferenceId": "23627",
    "cc": "CN",
    "state": "Yunnan",
    "county": "Lufeng",
    "formation": "Chuanjie",
    "member": "",
    "geological_group": "",
    "collection_name": "Quarry 1, Lao Chang Qing",
    "collection_aka": "Laochangjing, A'na; Konglongshan; Laochangqing; Ana Village; A’na village",
    "geogscale": "outcrop",
    "stratscale": "bed",
    "stratcomments": "From the base of the Chuanjie Formation, which was regarded to be Middle Jurassic (Bajocian), according to the magnetostratigraphic study of Huang et al. (2015).\r\n\r\nOriginally assigned to Lufeng but ascribed to Upper Jurassic based on vertebrate fossils. Considered base (lower member) of Upper Lufeng and thus early Middle Jurassic by Wu et al. 2009 (equivalent to Chuanjie Fm.)",
    "geogcomments": "S slope of hill, 50 m from highway connecting Kunming and Dali. Approx. 20 km S/SE of Lufeng, near Lao Chang Qing (= Laochangjing), A'na village, Chuanjie township, Lufeng county (GPS: 24°58'20.84\"N, 102° 4'34.31\"E)"
  }
]

Anhuilong · 1 captured occurrence(s)

Recorded provinces: Anhui.

Own reviewed supported locality result: 3 or fewer after locality and useful navigation.

[
  {
    "genusId": "376757",
    "genus": "Anhuilong",
    "occurrenceId": "1418650",
    "collectionId": "196538",
    "identifiedName": "Anhuilong diboensis n. gen. n. sp.",
    "acceptedName": "Anhuilong diboensis",
    "qualified": false,
    "occurrenceReferenceId": "66843",
    "collectionReferenceId": "66843",
    "cc": "CN",
    "state": "Anhui",
    "county": "Shexian",
    "formation": "Hongqin",
    "member": "",
    "geological_group": "",
    "collection_name": "Jimushan, Hengguan Village",
    "collection_aka": "",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "lower part of the Middle Jurassic Hongqin Formation",
    "geogcomments": "Jimushan of Hengguan Village, Wangcun Town, Shexian County, Huangshan City, Anhui Province, Eastern China"
  },
  {
    "genusId": "376757",
    "genus": "Anhuilong",
    "cc": "CN",
    "qualified": false,
    "literatureId": "asian-sauropod-13",
    "formation": "Hongqin",
    "state": "Anhui",
    "geographyReviewId": "mamenchi-geography-13-anhuilong"
  }
]

Bellusaurus · 1 captured occurrence(s)

Recorded provinces: Xinjiang.

Own reviewed supported locality result: 4 or fewer after locality and useful navigation.

[
  {
    "genusId": "54863",
    "genus": "Bellusaurus",
    "occurrenceId": "522076",
    "collectionId": "53670",
    "identifiedName": "Bellusaurus sui n. gen. n. sp.",
    "acceptedName": "Bellusaurus sui",
    "qualified": false,
    "occurrenceReferenceId": "9264",
    "collectionReferenceId": "9264",
    "cc": "CN",
    "state": "Xinjiang",
    "county": "",
    "formation": "Shishugou",
    "member": "Upper",
    "geological_group": "",
    "collection_name": "Konglonggou, IVPP Loc. 83003",
    "collection_aka": "Dinosaur ravine, Dinosaur Valley, Bellusaurus type; Kelameili.",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "base of the upper beds of the Shishugou Formation, between two tuffs",
    "geogcomments": "Konglonggou (Dinosaur Valley), S of Mt. Kelameili, Junggar Basin"
  },
  {
    "genusId": "54863",
    "genus": "Bellusaurus",
    "cc": "CN",
    "qualified": false,
    "literatureId": "asian-sauropod-15",
    "formation": "Shishugou",
    "state": "Xinjiang",
    "geographyReviewId": "mamenchi-geography-15-bellusaurus"
  }
]

Chuanjiesaurus · 1 captured occurrence(s)

Recorded provinces: Yunnan.

Own reviewed supported locality result: 3 or fewer after locality and useful navigation.

[
  {
    "genusId": "71525",
    "genus": "Chuanjiesaurus",
    "occurrenceId": "651334",
    "collectionId": "70438",
    "identifiedName": "Chuanjiesaurus anaensis n. gen. n. sp.",
    "acceptedName": "Chuanjiesaurus anaensis",
    "qualified": false,
    "occurrenceReferenceId": "16660",
    "collectionReferenceId": "23627",
    "cc": "CN",
    "state": "Yunnan",
    "county": "Lufeng",
    "formation": "Chuanjie",
    "member": "",
    "geological_group": "",
    "collection_name": "Quarry 1, Lao Chang Qing",
    "collection_aka": "Laochangjing, A'na; Konglongshan; Laochangqing; Ana Village; A’na village",
    "geogscale": "outcrop",
    "stratscale": "bed",
    "stratcomments": "From the base of the Chuanjie Formation, which was regarded to be Middle Jurassic (Bajocian), according to the magnetostratigraphic study of Huang et al. (2015).\r\n\r\nOriginally assigned to Lufeng but ascribed to Upper Jurassic based on vertebrate fossils. Considered base (lower member) of Upper Lufeng and thus early Middle Jurassic by Wu et al. 2009 (equivalent to Chuanjie Fm.)",
    "geogcomments": "S slope of hill, 50 m from highway connecting Kunming and Dali. Approx. 20 km S/SE of Lufeng, near Lao Chang Qing (= Laochangjing), A'na village, Chuanjie township, Lufeng county (GPS: 24°58'20.84\"N, 102° 4'34.31\"E)"
  }
]

Daanosaurus · 1 captured occurrence(s)

Recorded provinces: Sichuan.

Own reviewed supported locality result: 4 or fewer after locality and useful navigation.

[
  {
    "genusId": "146463",
    "genus": "Daanosaurus",
    "occurrenceId": "811556",
    "collectionId": "89050",
    "identifiedName": "Daanosaurus zhangi n. gen. n. sp.",
    "acceptedName": "Daanosaurus zhangi",
    "qualified": false,
    "occurrenceReferenceId": "29881",
    "collectionReferenceId": "29881",
    "cc": "CN",
    "state": "Sichuan",
    "county": "Zigong",
    "formation": "Shaximiao",
    "member": "Upper",
    "geological_group": "",
    "collection_name": "Yongan, Yantan",
    "collection_aka": "Zigong",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "Upper beds of the Shaximiao Formation",
    "geogcomments": "Yongan, Yantan, near Zigong"
  },
  {
    "genusId": "146463",
    "genus": "Daanosaurus",
    "cc": "CN",
    "qualified": false,
    "literatureId": "asian-sauropod-18",
    "formation": "Upper Shaximiao",
    "state": "Sichuan",
    "geographyReviewId": "mamenchi-geography-18-daanosaurus"
  }
]

Eomamenchisaurus · 1 captured occurrence(s)

Recorded provinces: Yunnan.

Own reviewed supported locality result: 3 or fewer after locality and useful navigation.

[
  {
    "genusId": "153855",
    "genus": "Eomamenchisaurus",
    "occurrenceId": "826867",
    "collectionId": "64016",
    "identifiedName": "Eomamenchisaurus yuanmouensis n. gen. n. sp.",
    "acceptedName": "Eomamenchisaurus yuanmouensis",
    "qualified": false,
    "occurrenceReferenceId": "30692",
    "collectionReferenceId": "18457",
    "cc": "CN",
    "state": "Yunnan",
    "county": "Yuanmou",
    "formation": "Zhanghe",
    "member": "",
    "geological_group": "",
    "collection_name": "Banqing Houshanliangzi, Jiangyi (Zhanghe Fm.)",
    "collection_aka": "Yuanmou",
    "geogscale": "outcrop",
    "stratscale": "bed",
    "stratcomments": "",
    "geogcomments": "Banqing Houshanliangzi of Jiangyi, N of Yuanmou city, Yuanmou administrative unit (county), Yunnan province"
  },
  {
    "genusId": "153855",
    "genus": "Eomamenchisaurus",
    "cc": "CN",
    "qualified": false,
    "literatureId": "asian-sauropod-14",
    "formation": "Zhanghe",
    "state": "Yunnan",
    "geographyReviewId": "mamenchi-geography-14-eomamenchisaurus"
  }
]

Huangshanlong · 1 captured occurrence(s)

Recorded provinces: Anhui.

Own reviewed supported locality result: 3 or fewer after locality and useful navigation.

[
  {
    "genusId": "309607",
    "genus": "Huangshanlong",
    "occurrenceId": "1244127",
    "collectionId": "163944",
    "identifiedName": "Huangshanlong anhuiensis n. gen. n. sp.",
    "acceptedName": "Huangshanlong anhuiensis",
    "qualified": false,
    "occurrenceReferenceId": "53528",
    "collectionReferenceId": "53528",
    "cc": "CN",
    "state": "Anhui",
    "county": "Huangshan",
    "formation": "Hongqin",
    "member": "",
    "geological_group": "",
    "collection_name": "Shexian, Tunxi",
    "collection_aka": "Huangshanlong anhuiensis type",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "",
    "geogcomments": "Shexian, near Tunxi, Huangshan, Anhui Province"
  },
  {
    "genusId": "309607",
    "genus": "Huangshanlong",
    "cc": "CN",
    "qualified": false,
    "literatureId": "asian-sauropod-13",
    "formation": "Hongqin",
    "state": "Anhui",
    "geographyReviewId": "mamenchi-geography-13-anhuilong"
  }
]

Hudiesaurus · 1 captured occurrence(s)

Recorded provinces: Xinjiang.

Own reviewed supported locality result: 3 or fewer after locality and useful navigation.

[
  {
    "genusId": "58889",
    "genus": "Hudiesaurus",
    "occurrenceId": "458375",
    "collectionId": "45172",
    "identifiedName": "Hudiesaurus sinojapanorum n. gen. n. sp.",
    "acceptedName": "Hudiesaurus sinojapanorum",
    "qualified": false,
    "occurrenceReferenceId": "11762",
    "collectionReferenceId": "11762",
    "cc": "CN",
    "state": "Xinjiang",
    "county": "Shanshan",
    "formation": "Kalazha",
    "member": "",
    "geological_group": "",
    "collection_name": "Qiketai, Turpan (Hudiesaurus type locality)",
    "collection_aka": "",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "Lower part of the Kalazha Formation (Upper Jurassic: upper Kimmeridgian–Tithonian)\r\n\r\n(also referred to as the Karaza, Kalaza, or Hongshan Formation)",
    "geogcomments": "Langgou, Qiketia area, Shanshan County, Xinjiang; Turpan Basin"
  },
  {
    "genusId": "58889",
    "genus": "Hudiesaurus",
    "cc": "CN",
    "qualified": false,
    "literatureId": "asian-sauropod-17",
    "formation": "Kalazha",
    "state": "Xinjiang",
    "geographyReviewId": "mamenchi-geography-17-hudiesaurus"
  }
]

Jingiella · 1 captured occurrence(s)

Recorded provinces: Guangxi Zhuang.

Own reviewed supported locality result: 2 or fewer after locality and useful navigation.

[
  {
    "genusId": "484710",
    "genus": "Jingiella",
    "occurrenceId": "1647117",
    "collectionId": "233635",
    "identifiedName": "Jingia dongxingensis n. gen. n. sp.",
    "acceptedName": "Jingiella dongxingensis",
    "qualified": false,
    "occurrenceReferenceId": "87607",
    "collectionReferenceId": "87607",
    "cc": "CN",
    "state": "Guangxi Zhuang",
    "county": "",
    "formation": "Dongxing",
    "member": "Lower",
    "geological_group": "",
    "collection_name": "Nanmushan village, Dongxing Town",
    "collection_aka": "",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "upper portion of the Lower Member of the Dongxing Formation",
    "geogcomments": "Nanmushan village, Dongxing Town, Dongxing City, Guangxi Zhuang Autonomous Region, South China"
  }
]

Klamelisaurus · 1 captured occurrence(s)

Recorded provinces: Xinjiang.

Own reviewed supported locality result: 4 or fewer after locality and useful navigation.

[
  {
    "genusId": "66626",
    "genus": "Klamelisaurus",
    "occurrenceId": "1107999",
    "collectionId": "140200",
    "identifiedName": "Klamelisaurus gobiensis n. gen. n. sp.",
    "acceptedName": "Klamelisaurus gobiensis",
    "qualified": false,
    "occurrenceReferenceId": "13896",
    "collectionReferenceId": "13896",
    "cc": "CN",
    "state": "Xinjiang",
    "county": "",
    "formation": "Shishugou",
    "member": "Lower",
    "geological_group": "",
    "collection_name": "Kelamaili, 35 km N of Jiangjunmiao (IVPP)",
    "collection_aka": "",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "lower beds of the Shishugou Formation (top of what was formerly called the \"Wucaiwan Formation\")",
    "geogcomments": "35 km N of Jiangjunmiao,S of Kelamailishan Mtns., Jiangjun Gebi, eastern Junggar Basin, Xinjiang"
  },
  {
    "genusId": "66626",
    "genus": "Klamelisaurus",
    "cc": "CN",
    "qualified": false,
    "literatureId": "asian-sauropod-16",
    "formation": "Shishugou",
    "state": "Xinjiang",
    "geographyReviewId": "mamenchi-geography-16-klamelisaurus"
  }
]

Omeisaurus · 13 captured occurrence(s)

Recorded provinces: Chongqing, Gansu, Sichuan.

Own reviewed supported locality result: 4 or fewer after locality and useful navigation.

[
  {
    "genusId": "38702",
    "genus": "Omeisaurus",
    "occurrenceId": "474577",
    "collectionId": "47071",
    "identifiedName": "Omeisaurus junghsiensis n. gen. n. sp.",
    "acceptedName": "Omeisaurus junghsiensis",
    "qualified": false,
    "occurrenceReferenceId": "12538",
    "collectionReferenceId": "15531",
    "cc": "CN",
    "state": "Sichuan",
    "county": "Rongxian",
    "formation": "Shaximiao",
    "member": "Daanzhai",
    "geological_group": "Chongqing",
    "collection_name": "Hsikuashan, Junghsien",
    "collection_aka": "Xiguashan, Dongmenwai, Rongxian",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "200 m above Tzeluting (Tzeliuching) Fm.\r\nSeveral radiometric ages have been reported for the Shaximiao Formation, including 167 Ma or 172 Ma (Zong and Shi, 1997), 167–172 Ma or 178–169 Ma (Gou et al., 2000), 163±3 Ma (Li et al., 2010), 160±4 Ma (Luo et al., 2014), 158±7 Ma (Qian et al., 2016), and 159±2 Ma (Wang et al., 2018). However, more recent studies suggest an older age; Dai et al. 2022 reported a maximum depositional age for the bone-bearing layers of the lower member of the Shaximiao formation to be Bjaocan. Zhou et al. 2022 also supported a late Middle Jurassic age for the Shaximiao Formation (Bathonian-Callovian).",
    "geogcomments": "Mt. Hsikuashan (Xiguashan), outside E gate of Dongmenwai, near Junghsien (Rongxian), Sichuan; a few yards E of river that runs N-S and E from city of Junghsien"
  },
  {
    "genusId": "38702",
    "genus": "Omeisaurus",
    "occurrenceId": "474578",
    "collectionId": "47072",
    "identifiedName": "? Omeisaurus junghsiensis",
    "acceptedName": "Omeisaurus junghsiensis",
    "qualified": true,
    "occurrenceReferenceId": "12538",
    "collectionReferenceId": "15531",
    "cc": "CN",
    "state": "Sichuan",
    "county": "",
    "formation": "Shaximiao",
    "member": "Lower",
    "geological_group": "Chongqing",
    "collection_name": "Chenchia",
    "collection_aka": "Chen Chia, Chenxi",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "below Tzeliuching limestone, and therefore below Omeisaurus junghsiensis type site\r\n\r\nWang et al. 2018 suggested an Oxfordian age for the lower beds, rather than Middle Jurassic\r\nSeveral radiometric ages have been reported for the Shaximiao Formation, including 167 Ma or 172 Ma (Zong and Shi, 1997), 167–172 Ma or 178–169 Ma (Gou et al., 2000), 163±3 Ma (Li et al., 2010), 160±4 Ma (Luo et al., 2014), 158±7 Ma (Qian et al., 2016), and 159±2 Ma (Wang et al., 2018). However, more recent studies suggest an older age; Dai et al. 2022 reported a maximum depositional age for the bone-bearing layers of the lower member of the Shaximiao formation to be Bjaocan. Zhou et al. 2022 also supported a late Middle Jurassic age for the Shaximiao Formation (Bathonian-Callovian).",
    "geogcomments": "Chenchia (Chen Chia, Chenxi), about 10 li (3.107 mi) NE of Junghsien city (Rongxian), Sichuan"
  },
  {
    "genusId": "38702",
    "genus": "Omeisaurus",
    "occurrenceId": "474628",
    "collectionId": "47076",
    "identifiedName": "cf. Omeisaurus junghsiensis",
    "acceptedName": "Omeisaurus junghsiensis",
    "qualified": true,
    "occurrenceReferenceId": "12540",
    "collectionReferenceId": "12540",
    "cc": "CN",
    "state": "Sichuan",
    "county": "",
    "formation": "",
    "member": "",
    "geological_group": "Chongqing",
    "collection_name": "locality 47 (8b), Guangyuan",
    "collection_aka": "",
    "geogscale": "outcrop",
    "stratscale": "group of beds",
    "stratcomments": "top of \"Kuangyuan Series\" = Chongqing Group/Guangyuan Group",
    "geogcomments": "S suburb of Kuangyuan/Guangyuan city, northern Sichuan, hill slopes of Chentsianyen escarpment"
  },
  {
    "genusId": "38702",
    "genus": "Omeisaurus",
    "occurrenceId": "474631",
    "collectionId": "47077",
    "identifiedName": "cf. Omeisaurus junghsiensis",
    "acceptedName": "Omeisaurus junghsiensis",
    "qualified": true,
    "occurrenceReferenceId": "12540",
    "collectionReferenceId": "12540",
    "cc": "CN",
    "state": "Sichuan",
    "county": "",
    "formation": "",
    "member": "",
    "geological_group": "Chongqing",
    "collection_name": "locality 48 (2), Chialingchiang",
    "collection_aka": "Guangyuan, Kwangyuan, Kuangyuan",
    "geogscale": "outcrop",
    "stratscale": "bed",
    "stratcomments": "basal part of \"Kuangyuan Series\" = Guangyuan Group (now equivalent to Chungking/Chongqing Group)",
    "geogcomments": "right bank of Chialingchiang, about 10 km N of Kuangyuan city"
  },
  {
    "genusId": "38702",
    "genus": "Omeisaurus",
    "occurrenceId": "522064",
    "collectionId": "53665",
    "identifiedName": "Omeisaurus luoquanensis n. sp.",
    "acceptedName": "Omeisaurus luoquanensis",
    "qualified": false,
    "occurrenceReferenceId": "28519",
    "collectionReferenceId": "28519",
    "cc": "CN",
    "state": "Sichuan",
    "county": "Zizhong",
    "formation": "Shaximiao",
    "member": "Lower",
    "geological_group": "",
    "collection_name": "Luoquan village",
    "collection_aka": "",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "from 2 beds, 5 m apart (IVPP V21502 from higher level)",
    "geogcomments": "Luoquan village, Zizhong county (coordinates for city of Zizhong)"
  },
  {
    "genusId": "38702",
    "genus": "Omeisaurus",
    "occurrenceId": "522077",
    "collectionId": "53671",
    "identifiedName": "Omeisaurus junghsiensis",
    "acceptedName": "Omeisaurus junghsiensis",
    "qualified": false,
    "occurrenceReferenceId": "14475",
    "collectionReferenceId": "14475",
    "cc": "CN",
    "state": "Gansu",
    "county": "",
    "formation": "",
    "member": "",
    "geological_group": "",
    "collection_name": "Chungchai sauropod site",
    "collection_aka": "Zhongzhai",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "",
    "geogcomments": "Chungchai, Kangsien, Gansu"
  },
  {
    "genusId": "38702",
    "genus": "Omeisaurus",
    "occurrenceId": "557581",
    "collectionId": "57771",
    "identifiedName": "Omeisaurus changshouensis n. sp.",
    "acceptedName": "Omeisaurus changshouensis",
    "qualified": false,
    "occurrenceReferenceId": "15533",
    "collectionReferenceId": "15533",
    "cc": "CN",
    "state": "Sichuan",
    "county": "Changshou",
    "formation": "Shaximiao",
    "member": "Upper",
    "geological_group": "Chongqing",
    "collection_name": "Moutzenhan (IVPP)",
    "collection_aka": "Shizitan, Changshou",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "Between the Chiating Beds and Chungking Beds; now = Shangshaximiao = Upper Shaximiao Fm.\r\nSeveral radiometric ages have been reported for the Shaximiao Formation, including 167 Ma or 172 Ma (Zong and Shi, 1997), 167–172 Ma or 178–169 Ma (Gou et al., 2000), 163±3 Ma (Li et al., 2010), 160±4 Ma (Luo et al., 2014), 158±7 Ma (Qian et al., 2016), and 159±2 Ma (Wang et al., 2018). However, more recent studies suggest an older age; Dai et al. 2022 reported a maximum depositional age for the bone-bearing layers of the lower member of the Shaximiao formation to be Bjaocan. Zhou et al. 2022 also supported a late Middle Jurassic age for the Shaximiao Formation (Bathonian-Callovian).",
    "geogcomments": "Moutzenhan, Szetzetan (Shizitan) Reservoir, Changshouhsien/Changshou along the Yangtze River some 111 km NE of Chungking."
  },
  {
    "genusId": "38702",
    "genus": "Omeisaurus",
    "occurrenceId": "572130",
    "collectionId": "51914",
    "identifiedName": "Omeisaurus fuxiensis n. sp.",
    "acceptedName": "Omeisaurus fuxiensis",
    "qualified": false,
    "occurrenceReferenceId": "17258",
    "collectionReferenceId": "13842",
    "cc": "CN",
    "state": "Sichuan",
    "county": "Zigong",
    "formation": "Shaximiao",
    "member": "Upper",
    "geological_group": "Chongqing",
    "collection_name": "Wujiaba Dam Quarry, Zigong",
    "collection_aka": "Shaheba",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "Several radiometric ages have been reported for the Shaximiao Formation, including 167 Ma or 172 Ma (Zong and Shi, 1997), 167–172 Ma or 178–169 Ma (Gou et al., 2000), 163±3 Ma (Li et al., 2010), 160±4 Ma (Luo et al., 2014), 158±7 Ma (Qian et al., 2016), and 159±2 Ma (Wang et al., 2018). However, more recent studies suggest an older age; Dai et al. 2022 reported a maximum depositional age for the bone-bearing layers of the lower member of the Shaximiao formation to be Bjaocan. Zhou et al. 2022 also supported a late Middle Jurassic age for the Shaximiao Formation (Bathonian-Callovian).",
    "geogcomments": "Wujiaba Dam (Shaheba Dam), along Fuhsi River (tributary of Tuojiang River) near city of Zigong (Tsekung), about 4 km SW"
  },
  {
    "genusId": "38702",
    "genus": "Omeisaurus",
    "occurrenceId": "739555",
    "collectionId": "24883",
    "identifiedName": "Omeisaurus tianfuensis n. sp.",
    "acceptedName": "Omeisaurus tianfuensis",
    "qualified": false,
    "occurrenceReferenceId": "28524",
    "collectionReferenceId": "6976",
    "cc": "CN",
    "state": "Sichuan",
    "county": "Zigong",
    "formation": "Shaximiao",
    "member": "Lower",
    "geological_group": "",
    "collection_name": "Dashanpu Dinosaur Quarry [lower]",
    "collection_aka": "Dashanpu Town",
    "geogscale": "outcrop",
    "stratscale": "bed",
    "stratcomments": "Based on detrital zircon U-Pb dating from this formation (but not this locality), Wang et al. (2018) suggested an Oxfordian age for the lower beds, rather than Middle Jurassic, with 159 ± 2 Ma as the maximum depositional age. However, from a section near the Dashanpu Dinosaur Quarry, Ren et al. (2022) documented the youngest age for the zircon sample as 166.0 ± 1.59 Ma, and weighed average ages of the youngest subpopulation under the constraints of 1σ and 2σ are 170.9 ± 0.64 Ma and 169.9 ± 0.63 Ma, with a maximum confidence age of 169.9 ± 0.63 Ma selected as the final result.",
    "geogcomments": "Dashanpu quarry, 10 km NE of Zigong, Sichuan, China"
  },
  {
    "genusId": "38702",
    "genus": "Omeisaurus",
    "occurrenceId": "975914",
    "collectionId": "24883",
    "identifiedName": "Omeisaurus jiaoi n. sp.",
    "acceptedName": "Omeisaurus jiaoi",
    "qualified": false,
    "occurrenceReferenceId": "37503",
    "collectionReferenceId": "6976",
    "cc": "CN",
    "state": "Sichuan",
    "county": "Zigong",
    "formation": "Shaximiao",
    "member": "Lower",
    "geological_group": "",
    "collection_name": "Dashanpu Dinosaur Quarry [lower]",
    "collection_aka": "Dashanpu Town",
    "geogscale": "outcrop",
    "stratscale": "bed",
    "stratcomments": "Based on detrital zircon U-Pb dating from this formation (but not this locality), Wang et al. (2018) suggested an Oxfordian age for the lower beds, rather than Middle Jurassic, with 159 ± 2 Ma as the maximum depositional age. However, from a section near the Dashanpu Dinosaur Quarry, Ren et al. (2022) documented the youngest age for the zircon sample as 166.0 ± 1.59 Ma, and weighed average ages of the youngest subpopulation under the constraints of 1σ and 2σ are 170.9 ± 0.64 Ma and 169.9 ± 0.63 Ma, with a maximum confidence age of 169.9 ± 0.63 Ma selected as the final result.",
    "geogcomments": "Dashanpu quarry, 10 km NE of Zigong, Sichuan, China"
  },
  {
    "genusId": "38702",
    "genus": "Omeisaurus",
    "occurrenceId": "1066328",
    "collectionId": "131866",
    "identifiedName": "Omeisaurus maoianus n. gen. n. sp.",
    "acceptedName": "Omeisaurus maoianus",
    "qualified": false,
    "occurrenceReferenceId": "42507",
    "collectionReferenceId": "42507",
    "cc": "CN",
    "state": "Sichuan",
    "county": "",
    "formation": "Shaximiao",
    "member": "Upper",
    "geological_group": "",
    "collection_name": "Omeisaurus maoianus type-locality",
    "collection_aka": "Jingyan, Sichuan",
    "geogscale": "",
    "stratscale": "bed",
    "stratcomments": "",
    "geogcomments": "Based on Google Earth placemark for Jingyan, Sichuan."
  },
  {
    "genusId": "38702",
    "genus": "Omeisaurus",
    "occurrenceId": "1472810",
    "collectionId": "205726",
    "identifiedName": "Omeisaurus puxiani n. sp.",
    "acceptedName": "Omeisaurus puxiani",
    "qualified": false,
    "occurrenceReferenceId": "72052",
    "collectionReferenceId": "70522",
    "cc": "CN",
    "state": "Chongqing",
    "county": "Yunyang",
    "formation": "Shaximiao",
    "member": "Lower",
    "geological_group": "Chongqing",
    "collection_name": "Laojun Village, Pu’an Town",
    "collection_aka": "Puan \"Dinosaur Wall\"; Yunyang",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "Lower to middle portion of the lower member of the Shaximiao Formation\r\nSeveral radiometric ages have been reported for the Shaximiao Formation, including 167 Ma or 172 Ma (Zong and Shi, 1997), 167–172 Ma or 178–169 Ma (Gou et al., 2000), 163±3 Ma (Li et al., 2010), 160±4 Ma (Luo et al., 2014), 158±7 Ma (Qian et al., 2016), and 159±2 Ma (Wang et al., 2018). However, more recent studies suggest an older age: Dai et al. (2022) reported a maximum depositional age for the bone-bearing layers of the lower member of the Shaximiao formation to be Bathonian, based on zircon U-Pb ages of 166.0 ± 1.5 Ma (Zhou et al. 2022). ",
    "geogcomments": "Laojun Village, Pu’an Town, Yunyang County, Chongqing Municipality"
  },
  {
    "genusId": "38702",
    "genus": "Omeisaurus",
    "occurrenceId": "1639782",
    "collectionId": "232460",
    "identifiedName": "Omeisaurus sp.",
    "acceptedName": "Omeisaurus",
    "qualified": false,
    "occurrenceReferenceId": "86568",
    "collectionReferenceId": "86568",
    "cc": "CN",
    "state": "Sichuan",
    "county": "",
    "formation": "Shaximiao",
    "member": "",
    "geological_group": "",
    "collection_name": "Weiyuan Anticline, Northwest",
    "collection_aka": "",
    "geogscale": "outcrop",
    "stratscale": "",
    "stratcomments": "\"The locality occurs in the northwest of the Weiyuan anticline, about 15 km from the north oblique axis in strata with a gentle inclination of 2° to ~5°. The fossil site is at the bottom of the Middle Jurassic Shaximiao Formation, which  measures  ~60  m  thick  from  the  top  of  the Xintiangou Formation.\"",
    "geogcomments": "Qinglongshan  Mountain,  Zhujiamiao  Village,  Fuxing Town, Rong County, Zigong City, Sichuan Province"
  },
  {
    "genusId": "38702",
    "genus": "Omeisaurus",
    "cc": "CN",
    "qualified": false,
    "literatureId": "asian-sauropod-18",
    "formation": "Upper Shaximiao",
    "possibleStates": [
      "Sichuan",
      "Chongqing"
    ],
    "geographyReviewId": "mamenchi-geography-18-omeisaurus"
  }
]

Qijianglong · 1 captured occurrence(s)

Recorded provinces: Chongqing.

Own reviewed supported locality result: 3 or fewer after locality and useful navigation.

[
  {
    "genusId": "313709",
    "genus": "Qijianglong",
    "occurrenceId": "1253472",
    "collectionId": "165720",
    "identifiedName": "Qijianglong guokr n. gen. n. sp.",
    "acceptedName": "Qijianglong guokr",
    "qualified": false,
    "occurrenceReferenceId": "54169",
    "collectionReferenceId": "54169",
    "cc": "CN",
    "state": "Chongqing",
    "county": "Qijiang",
    "formation": "Suining",
    "member": "",
    "geological_group": "",
    "collection_name": "Heba Village, Beidu Site",
    "collection_aka": "Qijianglong guokr type locality",
    "geogscale": "small collection",
    "stratscale": "formation",
    "stratcomments": "Wang et al. (2019) provide detrital zircon U/Pb mean ages of 114.4±1.1 Ma for the middle Suining Formation in Sichuan Basin, but it's not entirely certain whether this revised age is applicable to this collection",
    "geogcomments": ""
  },
  {
    "genusId": "313709",
    "genus": "Qijianglong",
    "cc": "CN",
    "qualified": true,
    "literatureId": "asian-sauropod-19",
    "formation": "Upper Shaximiao",
    "state": "Chongqing",
    "geographyReviewId": "mamenchi-geography-19-qijianglong"
  }
]

Rhomaleopakhus · 1 captured occurrence(s)

Recorded provinces: Xinjiang.

Own reviewed supported locality result: 3 or fewer after locality and useful navigation.

[
  {
    "genusId": "446268",
    "genus": "Rhomaleopakhus",
    "occurrenceId": "1584287",
    "collectionId": "169944",
    "identifiedName": "Rhomaleopakhus turpanensis n. gen. n. sp.",
    "acceptedName": "Rhomaleopakhus turpanensis",
    "qualified": false,
    "occurrenceReferenceId": "78881",
    "collectionReferenceId": "11762",
    "cc": "CN",
    "state": "Xinjiang",
    "county": "Shanshan",
    "formation": "Kalazha",
    "member": "",
    "geological_group": "",
    "collection_name": "Qiektai (Hudiesaurus referred forelimb locality)",
    "collection_aka": "",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "",
    "geogcomments": "1.1 km from the quarry of the Hudiesaurus type specimen"
  },
  {
    "genusId": "446268",
    "genus": "Rhomaleopakhus",
    "cc": "CN",
    "qualified": false,
    "literatureId": "asian-sauropod-17",
    "formation": "Kalazha",
    "state": "Xinjiang",
    "geographyReviewId": "mamenchi-geography-17-hudiesaurus"
  }
]

Tienshanosaurus · 3 captured occurrence(s)

Recorded provinces: Xinjiang.

Own reviewed supported locality result: 4 or fewer after locality and useful navigation.

[
  {
    "genusId": "38703",
    "genus": "Tienshanosaurus",
    "occurrenceId": "522040",
    "collectionId": "53658",
    "identifiedName": "Tienshanosaurus chitaiensis n. gen. n. sp.",
    "acceptedName": "Tienshanosaurus",
    "qualified": false,
    "occurrenceReferenceId": "24250",
    "collectionReferenceId": "24250",
    "cc": "CN",
    "state": "Xinjiang",
    "county": "",
    "formation": "Shishugou",
    "member": "Upper",
    "geological_group": "",
    "collection_name": "Paikushan (Luanshantze)",
    "collection_aka": "Pai-k'ou-ch'uan, Qitai, Chitai",
    "geogscale": "outcrop",
    "stratscale": "bed",
    "stratcomments": "also called the \"Upper Shuihsikou series\", and originally considered Lower Cretaceous",
    "geogcomments": "on a hill at  Paikushan (= Pai-k'ou-ch'uan, Baikouquan, Luanshantze), 144 km (250 li) N of Qitai (Chitai), Junggar Basin; bones from about 8 m apart"
  },
  {
    "genusId": "38703",
    "genus": "Tienshanosaurus",
    "occurrenceId": "557584",
    "collectionId": "57774",
    "identifiedName": "Tienshanosaurus chitaiensis",
    "acceptedName": "Tienshanosaurus",
    "qualified": false,
    "occurrenceReferenceId": "15533",
    "collectionReferenceId": "15533",
    "cc": "CN",
    "state": "Xinjiang",
    "county": "",
    "formation": "Shishugou",
    "member": "Upper",
    "geological_group": "",
    "collection_name": "Lamalishan, Chitai (IVPP)",
    "collection_aka": "Qiati",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "",
    "geogcomments": "Lamalishan, Chitai, Singkiang"
  },
  {
    "genusId": "38703",
    "genus": "Tienshanosaurus",
    "occurrenceId": "658311",
    "collectionId": "70960",
    "identifiedName": "Tienshanosaurus sp.",
    "acceptedName": "Tienshanosaurus",
    "qualified": false,
    "occurrenceReferenceId": "9264",
    "collectionReferenceId": "9264",
    "cc": "CN",
    "state": "Xinjiang",
    "county": "",
    "formation": "Shishugou",
    "member": "Upper",
    "geological_group": "",
    "collection_name": "Wucaiwan, Kelameili (IVPP)",
    "collection_aka": "",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "",
    "geogcomments": "Wucaiwan region, western Kelameili Mtns."
  }
]

Tonganosaurus · 1 captured occurrence(s)

Recorded provinces: Sichuan.

Own reviewed supported locality result: 2 or fewer after locality and useful navigation.

[
  {
    "genusId": "171374",
    "genus": "Tonganosaurus",
    "occurrenceId": "887573",
    "collectionId": "74735",
    "identifiedName": "Tonganosaurus hei n. gen. n. sp.",
    "acceptedName": "Tonganosaurus hei",
    "qualified": false,
    "occurrenceReferenceId": "33949",
    "collectionReferenceId": "33949",
    "cc": "CN",
    "state": "Sichuan",
    "county": "Huili",
    "formation": "Yimen",
    "member": "",
    "geological_group": "",
    "collection_name": "Tongbao village, Tong'an",
    "collection_aka": "Tonganosaurus site, Tongan",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "from upper-middle parts of formation",
    "geogcomments": "Tongbao Village, Tong'an (Tongan) Town, Huili County, southern Sichuan"
  }
]

Tongnanlong · 1 captured occurrence(s)

Recorded provinces: Chongqing.

Own reviewed supported locality result: 3 or fewer after locality and useful navigation.

[
  {
    "genusId": "511034",
    "genus": "Tongnanlong",
    "occurrenceId": "1703539",
    "collectionId": "241394",
    "identifiedName": "Tongnanlong zhimingi n. gen. n. sp.",
    "acceptedName": "Tongnanlong zhimingi",
    "qualified": false,
    "occurrenceReferenceId": "92519",
    "collectionReferenceId": "92519",
    "cc": "CN",
    "state": "Chongqing",
    "county": "Tongnan",
    "formation": "Suining",
    "member": "",
    "geological_group": "",
    "collection_name": "Dafo Street, Tongnan",
    "collection_aka": "",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "",
    "geogcomments": "The building site of Dafo Street (with GPS N30°10’44”, E105°48’17”), Tongnan District"
  }
]

Xinjiangtitan · 1 captured occurrence(s)

Recorded provinces: Xinjiang.

Own reviewed supported locality result: 2 or fewer after locality and useful navigation.

[
  {
    "genusId": "287379",
    "genus": "Xinjiangtitan",
    "occurrenceId": "1190808",
    "collectionId": "153762",
    "identifiedName": "Xinjiangtitan shanshanesis n. gen. n. sp.",
    "acceptedName": "Xinjiangtitan shanshanesis",
    "qualified": false,
    "occurrenceReferenceId": "49813",
    "collectionReferenceId": "49813",
    "cc": "CN",
    "state": "Xinjiang",
    "county": "Piqan",
    "formation": "Qiketai",
    "member": "",
    "geological_group": "",
    "collection_name": "Shanshan, Piqan",
    "collection_aka": "Xinjiangtitan type locality",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "Originally described as from the Qigu Formation by Wu et al. (2013), but Maisch et al. (2019) argued that it is from the Qiketai Formation",
    "geogcomments": "Piqan = Shanshan County, Turpan Basin"
  },
  {
    "genusId": "287379",
    "genus": "Xinjiangtitan",
    "occurrenceId": "1190808",
    "collectionId": "153762",
    "identifiedName": "Xinjiangtitan shanshanesis n. gen. n. sp.",
    "acceptedName": "Xinjiangtitan shanshanesis",
    "qualified": false,
    "occurrenceReferenceId": "49813",
    "collectionReferenceId": "49813",
    "cc": "CN",
    "state": "Xinjiang",
    "county": "Piqan",
    "formation": "Qigu",
    "member": "",
    "geological_group": "",
    "collection_name": "Shanshan, Piqan",
    "collection_aka": "Xinjiangtitan type locality",
    "geogscale": "small collection",
    "stratscale": "bed",
    "stratcomments": "Originally described as from the Qigu Formation by Wu et al. (2013), but Maisch et al. (2019) argued that it is from the Qiketai Formation",
    "geogcomments": "Piqan = Shanshan County, Turpan Basin",
    "horizonReviewId": "xinjiangtitan-qigu-alternative",
    "horizonCertainty": "disputed alternative"
  }
]

Yuanmousaurus · 1 captured occurrence(s)

Recorded provinces: Yunnan.

Own reviewed supported locality result: 3 or fewer after locality and useful navigation.

[
  {
    "genusId": "84655",
    "genus": "Yuanmousaurus",
    "occurrenceId": "602115",
    "collectionId": "64016",
    "identifiedName": "Yuanmousaurus jiangyiensis n. gen. n. sp.",
    "acceptedName": "Yuanmousaurus jiangyiensis",
    "qualified": false,
    "occurrenceReferenceId": "18457",
    "collectionReferenceId": "18457",
    "cc": "CN",
    "state": "Yunnan",
    "county": "Yuanmou",
    "formation": "Zhanghe",
    "member": "",
    "geological_group": "",
    "collection_name": "Banqing Houshanliangzi, Jiangyi (Zhanghe Fm.)",
    "collection_aka": "Yuanmou",
    "geogscale": "outcrop",
    "stratscale": "bed",
    "stratcomments": "",
    "geogcomments": "Banqing Houshanliangzi of Jiangyi, N of Yuanmou city, Yuanmou administrative unit (county), Yunnan province"
  },
  {
    "genusId": "84655",
    "genus": "Yuanmousaurus",
    "cc": "CN",
    "qualified": false,
    "literatureId": "asian-sauropod-14",
    "formation": "Zhanghe",
    "state": "Yunnan",
    "geographyReviewId": "mamenchi-geography-14-eomamenchisaurus"
  }
]

Zigongosaurus · 0 captured occurrence(s)

Recorded provinces: No genus-linked occurrence; literature geography reviewed separately.

Own reviewed supported locality result: No supported target comparison; not approved as a hidden answer.

[
  {
    "genusId": "66512",
    "genus": "Zigongosaurus",
    "cc": "CN",
    "qualified": false,
    "literatureId": "asian-sauropod-18",
    "formation": "Upper Shaximiao",
    "state": "Sichuan",
    "geographyReviewId": "mamenchi-geography-18-zigongosaurus"
  }
]

The 18 genera with supported own-locality comparisons were also rechecked; 0 exceed five after their locality and reaching guess. These counts do not approve their scientific eligibility.

Later scientific decisions: four horizon and identity cases →

The own-locality counts above are a screening checkpoint. The later review replaces disputed formation clues with safer geography and rechecks period uncertainty before scientific approval.

Source dossiers

Limits

Every captured occurrence for these 19 genera was inspected, including 13 Omeisaurus records, qualified identifications and its blank-horizon Gansu record. Targeted primary literature review is not proof of exhaustive fossil absence; new credible Tibetan occurrences must be added and can change the result.
Exact geographic amendments apply to identified existing summaries, not to whole-genus ranges or independent future fossils. Omeisaurus summary possibleStates preserves uncertainty and creates no positive occurrence.
Some original descriptions were inaccessible; each dossier records full-text versus abstract access and unresolved original specimen/age issues.
Counts use the frozen source tree, all three provisional standard clues and every wrong guess reaching the target parent. They do not certify the future Expert tree, every possible game history or hidden-answer readiness.
The live 36-genus sample remains unchanged. These source-review clue proposals and geography overlays are documented for the expanded roster; they are not newly activated game clues.