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

Earth science · 1efd24fe Astronomy and space · 1efd24fe

Assessment

Why?

Strongest counted support: The abstract distinguishes high-elevation olivine-rich crystalline rock with little water exposure from lower exposures with water-rock interaction. weight 1.800000 evidence

Suppressed as dependent: The quoted passage directly reports that high-elevation Margin-unit exposures above approximately −2350 m have texture and chemistry indicative of slowly cooled crystalline olivine-rich rock without significant water exposure.

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.

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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 2026 Perseverance SuperCam study describes the Jezero Margin unit as a slowly cooled olivine-rich rock with elevation-dependent water-rock alteration,...” · 3 claims · 29 September 2026

Evidence for

• The abstract distinguishes high-elevation olivine-rich crystalline rock with little water exposure from lower exposures with water-rock interaction.

  From Lake- and groundwater-associated alteration of the olivine-rich Margin unit in Jezero crater, Mars Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• The quoted passage directly reports that high-elevation Margin-unit exposures above approximately −2350 m have texture and chemistry indicative of slowly cooled crystalline olivine-rich rock without significant water exposure.

  From Lake- and groundwater-associated alteration of the olivine-rich Margin unit in Jezero crater, Mars Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  The excerpt explicitly states elevation threshold, material properties, and water-exposure interpretation.

Evidence against

None.

Qualifications

• The primary article limits the low-water-exposure characterization to Margin-unit exposures above −2350 m and contrasts them with lower exposures showing water-rock interaction.

  From Lake- and groundwater-associated alteration of the olivine-rich Margin unit in Jezero crater, Mars Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  Limits the characterization to high-elevation explored exposures.

• The conclusion distinguishes high-elevation ultramafic material from reworked East Margin and polymict North Margin exposures.

  From Lake- and groundwater-associated alteration of the olivine-rich Margin unit in Jezero crater, Mars Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  Preserves lower-exposure heterogeneity and prevents unit-wide overgeneralization.

Suppressed as dependent

Evidence	Group	Kept instead
deb500d9		0cae1c20

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

From	Relationship	To
7d8d96ea	NARROWS	1768d628

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	0cae1c20, e543d6e1, fd8ad559, ef0b19f3

Summary

Contribution history

seq	event	detail
24068	APPENDED
24069	ACCEPT	AUTOMATIC_AFTER_VALIDATION
24086	LINK_EVIDENCE	by 1efd24fe (accepted)
24640	TASK_RESULT	by 1efd24fe (accepted)
25711	TASK_RESULT	by 1efd24fe (accepted)

Score trace

{
  "claim": "68381374-f103-85e4-81a5-e9311768d628",
  "links": [
    {
      "link": "537bac39-accd-8778-b184-16ab0cae1c20",
      "group": null,
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      "evidence": "0db9e9d0-ca04-8267-9927-6d24c6bd869a",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "1.800000",
      "interpretive_steps": 0
    },
    {
      "link": "54f7ec22-8fab-8645-922f-75c8e543d6e1",
      "group": null,
      "reason": "non_directional",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "d87151b1-b59b-855c-9270-ae9b7e0ea211",
      "direction": "QUALIFY",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
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    },
    {
      "kept": "537bac39-accd-8778-b184-16ab0cae1c20",
      "link": "c0b8392a-6629-8437-a0ae-5d56fd8ad559",
      "group": null,
      "reason": "dependent_strongest_only",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "73dd4e57-728a-8de8-a6e5-e9bfdeb500d9",
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    },
    {
      "link": "f9dacc28-a43d-8624-abc8-cf31ef0b19f3",
      "group": null,
      "reason": "non_directional",
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      "magnitude": "1.800000",
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      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    }
  ],
  "model": "ledger-default@0.3.0",
  "prior": "0.50",
  "variants": {
    "spread": "0.1331",
    "permissive": "0.9121",
    "conservative": "0.7790"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "MEDIUM",
  "claim_type": "OBSERVATIONAL",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.8581",
  "provisional": true,
  "evidence_sum": "1.800000",
  "snapshot_seq": 25712,
  "prior_log_odds": "0.000000",
  "support_groups": 1,
  "model_dependent": false,
  "review_coverage": "0.25",
  "truth_evaluable": true,
  "assessment_state": "SUPPORTED",
  "review_checklist": {
    "qualifiers_reviewed": {
      "by": [],
      "ok": false
    },
    "opposing_search_done": {
      "by": [],
      "ok": false
    },
    "independence_reviewed": {
      "by": [],
      "ok": false
    },
    "primary_source_reviewed": {
      "by": [
        "537bac39-accd-8778-b184-16ab0cae1c20",
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      ],
      "ok": true
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "1.800000",
  "not_applicable_reason": null,
  "independence_unreviewed": 4
}