Claim

In the study’s fossil synthesis, Western and Central European tree-genus richness declined 75% from its Miocene peak to the Holocene.

Type QUANTITATIVE · truth-evaluable: yes · status at snapshot: ACTIVE · created seq 19814

a conjunction joins clauses that may be separately evaluable

Referenced 109 times: checked 1, looked up by assistants 2, viewed 80, shared 26. A count of attention, not evidence.

Topics

Wildlife · 1efd24fe Ancient · 1efd24fe

Assessment

Supported

Score: 0.8808 under ledger-default@0.3.0 at snapshot 27745

2 of 4 review checks done · 1 counted · 1 by the author only

1 independent evidence lineage · review checks 1 of 4 · stability MEDIUM

Main unresolved issue: 6 counted evidence items have no independence review; repeats of one origin may be counted as several coverage:30b10df1-79eb-8d97-b3fa-15832c4d9cd9

Not yet independently audited.Evidence reviewed so far supports this claim, but only 1 of 4 review checks has been done.Every quoted passage was confirmed on the page when Galedra fetched it.

Why?

Strongest counted support: The primary study reports the long-term decline in tree-genus richness. weight 2.000000 evidence

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

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

Hide calculation

0.8808 under ledger-default@0.3.0 at snapshot 27745 · state Supported · Review checks: 1 of 4 · stability MEDIUM · 6 sources, 1 independent lineage

Model ledger-default@0.3.0 (the default model, not the answer) · snapshot 27745 · trace sha256:8fd6825c36434a4214a0dce92cb5ee4e08b675652ded322e985410738be7ca3b

Last changed at entry seq 26014; nothing logged since has borne on this claim.

How the number was reached

Each counted link is weighed by multiplying the factors the model declares; a factor it does not declare is not shown. Every factor name below links to what that number means.

Link	Working	Weight	Counted as
9d1a9276 support	relevance DIRECT 2.0 × observation MEASUREMENT 1.0 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	2.000000	2.000000
39cc2451 qualify	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	0.000000 (non directional)
d35cf575 qualify	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	0.000000 (non directional)
aa5e986b qualify	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	0.000000 (non directional)
60dc021d qualify	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	0.000000 (non directional)
76e3721b qualify	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	0.000000 (non directional)

prior 0.50 → log-odds 0.000000 + 2.000000 (the counted weights) = 2.000000 → probability 0.8808

Under neighbouring settings of the same model: 0.8022 to 0.9309, a spread of 0.1287.

Half-even rounding, six places for weights and four for the probability. The same inputs under the same model reproduce this exactly; that is what the trace hash above is for. How a score is worked out explains every factor, why it is there, and what the model sets it to.

Your view

Registered views

Nobody has registered a view yet.

Registered views are personal belief, not evidence: they never change Galedra's assessment. Affiliations are self-declared and shown only for groups of 5 or more.

Checked as part of

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

“A fossil-occurrence synthesis and climate-niche analysis examined Cenozoic tree-diversity change in Western and Central Europe.” · 3 claims · 29 September 2026

Evidence for

The primary study reports the long-term decline in tree-genus richness.

From Cenozoic losses of tree diversity constrain climatic adaptation of Western and Central European forests Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Primary quantitative result.

Evidence against

None.

Qualifications

The passage directly reports a 75% decline in tree-genus richness from the Miocene peak to the Holocene, but omits the Western and Central European geographic qualifier.

From Cenozoic losses of tree diversity constrain climatic adaptation of Western and Central European forests Read 2026-09-29 Relevance DIRECT Steps 0 Counted

The percentage and interval are explicit; the regional scope is absent.
The 75% decline compares tree-genus richness after the Miocene peak with the Holocene across a 66-million-year Cenozoic synthesis.

From Cenozoic losses of tree diversity constrain climatic adaptation of Western and Central European forests Read 2026-09-29 Relevance DIRECT Steps 0 Counted
The fossil synthesis contains 711 occurrences from Western and Central Europe, specifically eleven listed countries.

From Cenozoic losses of tree diversity constrain climatic adaptation of Western and Central European forests Read 2026-09-29 Relevance DIRECT Steps 0 Counted
The count is genus-level: Miocene peak 151 genera, 200 fossil-record genera overall, and 37 native today.

From Cenozoic losses of tree diversity constrain climatic adaptation of Western and Central European forests Read 2026-09-29 Relevance DIRECT Steps 0 Counted
Tree genus membership required at least 30% of accepted species in a genus to be tree-forming.

From Cenozoic losses of tree diversity constrain climatic adaptation of Western and Central European forests Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Suppressed as dependent

None.

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: 1 of 4

2 checks by this claim's own author, alongside the independent review above. 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	yes	9d1a9276, 39cc2451, d35cf575, aa5e986b, 60dc021d, 76e3721b

Summary

Supported. The main support is: The primary study reports the long-term decline in tree-genus richness. 47ca03b3

Qualifier: The fossil synthesis contains 711 occurrences from Western and Central Europe, specifically eleven listed countries. f3e1622c

Qualifier: The passage directly reports a 75% decline in tree-genus richness from the Miocene peak to the Holocene, but omits the Western and Central European geographic qualifier. c0b47c6a

Qualifier: The 75% decline compares tree-genus richness after the Miocene peak with the Holocene across a 66-million-year Cenozoic synthesis. 3e53c083

Qualifier: Tree genus membership required at least 30% of accepted species in a genus to be tree-forming. f96fcd6f

Qualifier: The count is genus-level: Miocene peak 151 genera, 200 fossil-record genera overall, and 37 native today. 0be6c1bd

Generated by stub-v0.1; every sentence cites graph ids.

Contribution history

seq	event	detail
19814	APPENDED
19815	ACCEPT	AUTOMATIC_AFTER_VALIDATION
19830	LINK_EVIDENCE	by 1efd24fe (accepted)
24800	TASK_RESULT	by 1efd24fe (accepted)
26013	TASK_RESULT	by 1efd24fe (accepted)

Score trace

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