Step 1
The truth verdict is a human-reviewed record; the freshness verdict is computed by comparing the primary-source date against the AI Overviews launch date, never against Google's algorithm.
Public tool method · Version 1.0.0
Use this method when you need to answer: Is this search or SEO stat true, and is it still current after AI Overviews? It turns the evidence you supply into a Sourced truth and freshness verdict by applying explicit, versioned decision rules. The result is not a benchmark or certification. It shows the strongest evidence, riskiest input, next action, owner, and review date so another reader can inspect and challenge the decision.
Last material review 2026-08-08 · Next review 2026-11-06
Question answered
The Fossil Checker answers two independent questions about a stat: a truth verdict from one versioned claims dataset, and a freshness verdict that dates the stat's primary source against the May 14, 2024 US launch of AI Overviews.
The truth verdict is a human-reviewed record; the freshness verdict is computed by comparing the primary-source date against the AI Overviews launch date, never against Google's algorithm.
A stat sourced before the launch that describes the results page itself is a fossil, because it measured a page that structurally no longer exists; a ranking-factor or corporate fact is not dated out by the launch.
A stat whose magnitude is disputed or superseded reads as contested, direction intact and specific number not.
A stat with no matching record returns a Self-Date checklist rather than a fabricated verdict, and every verdict and freshness call is a versioned record reviewed at least quarterly.
Record the required inputs and label missing or estimated evidence before classification.
A dated, twin-verdict check replaces stale SEO stats before they shape a budget decision.
Primary metric: Fossil check result view, verdict copy, or Claims Index deep-link
Worked example and modes
Distribution package
Blank CSV template90-second demonstrationThree share treatmentsPlain-language answer
<iframe src="https://petrichorgrowth.com/tools/seo-benchmark-claims/embed.html" title="SEO Stat Fossil Checker" loading="lazy" width="100%" height="900"></iframe>
<p>Source: <a href="https://petrichorgrowth.com/tools/seo-benchmark-claims">SEO Stat Fossil Checker by Petrichor</a></p>Ownership and change control
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A material method change requires a reason, impact note, fixture rerun, semantic-version increment, and public entry in the method change log.
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AI Skill Assurance answerAuthority Ledger answerCategory Evidence answer
Method questions
A versioned Sourced truth and freshness verdict with visible reasoning, evidence status, next action, ownership, and review date.
Only the structured decision evidence named by the instrument. Missing or estimated inputs remain visible in the result.
No. It applies deterministic rules to the user's inputs and does not compare one customer with another.
The current method is reviewed at least every 90 days. Material changes require new fixtures, a version increment, and a public change note.
When the unresolved decision requires team challenge, evidence reconciliation, dissent, ownership, and an organizational commitment.