Claim

Model ledger-default@0.1.0 ledger-strict@0.1.0 ledger-default@0.2.0 ledger-strict@0.2.0 ledger-default@0.3.0 (default) ledger-strict@0.3.0 Snapshot seq

Topics

Biology · 1efd24fe Archaeology · 1efd24fe

Assessment

Why?

Strongest counted support: Global Times reports that the approximately 125-million-year-old fossil is the earliest confirmed swimming mammal discovered to date. weight 1.800000 evidence

Strongest counted contradiction: An earlier Jurassic mammaliaform was reported as the earliest-known swimming mammal, so Dongoconodon is not earliest under an unqualified mammal definition. weight 1.800000 evidence

Suppressed as dependent: Global Times reports that the approximately 125-million-year-old fossil is the earliest confirmed swimming mammal discovered to date.

Review gaps: qualifiers reviewed, opposing search done, independence reviewed, primary source reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Unresolved.

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Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

• “Dongoconodon platycauda, an approximately 125-million-year-old Early Cretaceous mammal from China, is the earliest confirmed swimming mammal discovered to date.” · 1 claim · 29 September 2026
• “Dongoconodon platycauda is an approximately 125-million-year-old early mammal with evidence of swimming adaptations, including expanded feet and a flattened...” · 2 claims · 29 September 2026

Evidence for

• Global Times reports that the approximately 125-million-year-old fossil is the earliest confirmed swimming mammal discovered to date.

  From Earliest confirmed swimming mammal discovered in China Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• Global Times reports that the approximately 125-million-year-old fossil is the earliest confirmed swimming mammal discovered to date.

  From Earliest confirmed swimming mammal discovered in China Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• 凤凰网 reports the approximately 125-million-year-old mammal is the earliest currently confirmed mammal with swimming ability.

  From 南大科学家联合国内外学者最新发现：1.25亿年前的小型哺乳动物会游泳 Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Evidence against

• An earlier Jurassic mammaliaform was reported as the earliest-known swimming mammal, so Dongoconodon is not earliest under an unqualified mammal definition.

  From Scientists Discover First Swimming Mammal From The Jurassic Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  Directly challenges the broad earliest-swimming-mammal wording; the claim would need the paper's narrower crown-group qualifier.

Qualifications

None.

Suppressed as dependent

Evidence	Group	Kept instead
368241d2		3a1ba9fb

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 0 of 4

3 checks by this claim's own author. No independent review yet. 1 OPPOSING EVIDENCE SEARCH · 1 QUALIFIER CHECK · 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	no
opposing search done	no
independence reviewed	no
primary source reviewed	no

Summary

Contribution history

seq	event	detail
23936	APPENDED
23937	ACCEPT	AUTOMATIC_AFTER_VALIDATION
23948	LINK_EVIDENCE	by 1efd24fe (accepted)
23982	TASK_RESULT	by 1efd24fe (accepted)
24009	LINK_EVIDENCE	by 1efd24fe (accepted)
25935	TASK_RESULT	by 1efd24fe (accepted)