{ "reviewedAt": "2026-10-10", "scope": "Omeisaurus type occurrence474577 horizon mismatch; no shared repository edits", "decision": "Clear the Daanzhai member field for exact type occurrence474577 only; retain Shaximiao formation and all frozen locality/identification data. Do not choose Lower or Upper categorically.", "status": "Member error resolved by specimen/site-level primary re-examination. Lower-versus-Upper boundary disagreement explicitly retained; original1939 account remains inaccessible.", "sources": [ { "id": "young1939", "title": "Young1939, On a New Sauropoda, with Notes on Other Fragmentary Reptiles from Szechuan", "doi": "10.1111/j.1755-6724.1939.mp19003005.x", "url": "https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1755-6724.1939.mp19003005.x", "access": "Publisher metadata read; pdf and epdf paths returned Internal Error. Original full text not accessed. Broader searches yielded citation records, not original.", "webRef": "turn359search2", "supports": "Bibliographic identity only; do not claim original wording directly verified." }, { "id": "dong1983", "title": "Dong, Zhou and Zhang1983, Dinosaurs from the Jurassic of Sichuan", "url": "https://naturalhistory.si.edu/sites/default/files/media/translated_publications/Dong%26amp%3B_83.pdf", "access": "Full original monograph in Will Downs1999 English translation hosted by Smithsonian, relevant geological history and type-site re-examination read; original Chinese not accessed.", "sections": "Printedpp29–30/PDFpp36–37; geological history printedpp2–4/PDFpp9–11", "webRef": "turn371view0", "evidence": "The original type was collected in1936 at Xiguashan, Dongmenwai, Rongxian. Reported horizon is200m above Ziliujing limestone, identified as Daanzhai. The1978 quarry recheck found a lower/upper Shaximiao boundary problem: mapping put the boundary above the quarry; authors preferred shifting it below based on fauna but lacked the usual conchostracan control. Their interpretation is basal Upper Shaximiao, equivalent to Wujiaba. Referrals and proposed neotype from Wujiaba are separate specimens.", "interpretation": "Daanzhai denotes the underlying limestone reference horizon, not the type-bearing Shaximiao member. This is not proof of a historical Daanzhai/Shaximiao synonym or modern member-level certainty." }, { "id": "tan2019", "title": "Tan et al.2019, Discovery of Omeisaurus in Middle Jurassic Shaximiao Formation of Yunyang, Chongqing, China", "doi": "10.19615/j.cnki.1000-3118.181115", "url": "https://www.vertpala.ac.cn/EN/10.19615/j.cnki.1000-3118.181115", "fullTextUrl": "https://www.researchgate.net/publication/332369134_Discovery_of_Omeisaurus_Dinosauria_Sauropoda_in_the_Middle_Jurassic_Shaximiao_Formation_of_Yunyang_Chongqing_China", "access": "Publisher abstract and full author-uploaded original read.", "sections": "Printedp112, species comparison", "webRef": "turn381view1", "evidence": "Explicitly places type species O.junghsiensis in Lower Shaximiao at Rongxian, Sichuan. This is a modern comparative summary, not a reported fresh type-quarry survey. It separately places O.changshouensis and O.maoianus in Upper Shaximiao; species ranges cannot be transferred to all genus records." }, { "id": "li2011", "title": "Li et al.2011, Dinosaur assemblages from Middle Jurassic Shaximiao Formation and Chuanjie Formation in Sichuan-Yunnan Basin", "url": "https://vjs.pgi.gov.pl/article/download/26567/18275/39914", "access": "Full22page original review read via web PDF.", "sections": "PDFp2/printedp23 lower-member list;PDFp6/printedp27 Table1", "webRef": "turn384view2", "evidence": "Lists O.junghsiensis in Lower Shaximiao fauna, supporting the later lower-member attribution. This is assemblage summary evidence rather than an independent specimen-level remapping of the1936 type site." }, { "id": "dangelo2021", "title": "D’Angelo2021, A Maze of Omeisaurus: Observations on Taxonomic Status of O.junghsiensis", "url": "https://vertpaleo.org/wp-content/uploads/2021/10/SVP_2021_VirtualBook_final.pdf", "access": "Full published conference abstract, printedp94/PDFp93 read.", "webRef": "turn381view2", "evidence": "Notes lost O.junghsiensis holotype and poorly understood genus taxonomy. Does not solve locality-member boundary or justify collapsing all referrals.", "weight": "Conference abstract; not a full revision or a reason to override selected PBDB genus." } ], "exactOccurrenceReview": { "genus": "Omeisaurus", "pbdbGenusId": "38702", "occurrenceId": "474577", "collectionId": "47071", "identifiedName": "Omeisaurus junghsiensis n. gen. n. sp.", "acceptedName": "Omeisaurus junghsiensis", "qualified": false, "frozen": { "cc": "CN", "state": "Sichuan", "county": "Rongxian", "formation": "Shaximiao", "member": "Daanzhai", "geological_group": "Chongqing", "collection_name": "Hsikuashan, Junghsien", "collection_aka": "Xiguashan, Dongmenwai, Rongxian" }, "proposedFields": { "member": "" }, "expectedFrozenFields": { "formation": "Shaximiao", "member": "Daanzhai", "state": "Sichuan" }, "reason": "Specimen-level1983 type-quarry account places type above Daanzhai limestone. Leaving Daanzhai as a member creates an unsupported type-bearing horizon. Clearing it preserves uncertain Lower/Upper correlation rather than inventing precision.", "alternatives": [ { "member": "Lower", "sourceIds": [ "tan2019", "li2011" ], "status": "Later published comparative/assemblage attribution; retained as possible correlation." }, { "member": "Upper", "sourceIds": [ "dong1983" ], "status": "Type-site re-examination authors preferred basal Upper, but explicitly disputed mapped boundary and missing stratigraphic control; retained as possible correlation." } ], "note": "The type-bearing beds are above Daanzhai limestone within Shaximiao; published Lower and basal Upper correlations disagree. Keep both in research/provenance, and use formation-level clues unless more precise site evidence settles the boundary.", "noChangeFields": [ "formation", "geological_group", "cc", "state", "county", "collection_name", "collection_aka", "identifiedName", "acceptedName", "qualified", "periods", "sourceTree" ] }, "footprintSafeguards": { "frozenRows": 13, "amendedRows": 1, "unchangedRows": 12, "unchangedOccurrenceIds": [ "474578", "474628", "474631", "522064", "522077", "557581", "572130", "739555", "975914", "1066328", "1472810", "1639782" ], "qualifiedOccurrencesRetained": [ "474578", "474628", "474631" ], "gansuUnknownRetained": "522077 Chungchai/Zhongzhai, Gansu: blank formation/member/group remain unknown. No species summary fills these fields or excludes a possible non-primary occurrence.", "typeReferralSeparation": "Do not treat Wujiaba specimens described or nominated as neotype/hypodigms in1983 as the1936 Rongxian type record. Their geological attribution does not overwrite every record.", "wholeGenusAbsenceClaimed": false, "pbdbGuessEligibilityChanged": false, "genusIdentityChanged": false }, "gameImplication": "Use the existing formation-level Shaximiao footprint with full referral coverage. The exact Daanzhai field correction need not reduce any legitimate candidate count. No mandatory discovery-year clue or genotype roster exception follows from this metadata correction.", "curatorNoteSuggested": "Omeisaurus: the type record labelled Daanzhai actually refers to beds above that limestone. We retain Shaximiao Formation and leave its member unresolved because published Lower and basal Upper correlations disagree. Other species, tentative referrals and the incomplete Gansu occurrence remain in its locality footprint.", "residualResearch": "A fresh, explicit type-quarry stratigraphic correlation could settle Lower versus Upper. Obtain/read Young1939 original when available for archival provenance; resolving the misplaced underlying-unit member does not depend on claiming that original was accessed." }