Claim

The slow-cooled, olivine-rich, low-water-exposure characterization applies to high-elevation (>−2350 m) Margin-unit exposures explored by Perseverance; lower exposures near the Western fan and North Margin show reworking or water-rock interaction, so the result is not uniform across the unit.

Type OBSERVATIONAL · truth-evaluable: yes · status at snapshot: ACTIVE · created seq 25711

38 words; atomic claims are usually under 25a conjunction joins clauses that may be separately evaluablea comma-separated series may list several propositionsan inference word joins a premise to a conclusion; consider separate claims and an edge

Referenced 96 times: checked 0, looked up by assistants 0, viewed 96, shared 0. A count of attention, not evidence.

Topics

Not filed under any topic yet.

Assessment

Supported

Score: 0.8581 under ledger-default@0.3.0 at snapshot 27745

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

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

Main unresolved issue: 1 counted evidence item has no independence review; repeats of one origin may be counted as several coverage:197d2be2-c3ea-8f95-9e8e-f4607d8d96ea

Not yet independently audited.Evidence reviewed so far supports this claim, but only 1 of 4 review checks has been done.

Related: NARROWS outgoing: Supported

Why?

Strongest counted support: The primary Communications Earth & Environment article directly distinguishes high-elevation low-water-exposure Margin-unit rock from lower exposures with complex water-rock interaction and physical reworking. weight 1.800000 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

0.8581 under ledger-default@0.3.0 at snapshot 27745 · state Supported · Review checks: 1 of 4 · stability MEDIUM · 1 source, 1 independent lineage

Model ledger-default@0.3.0 (the default model, not the answer) · snapshot 27745 · trace sha256:39113cccfa45d216eb095556fe4767d9093423bd8e36bc11ed8dd1b5647fe4b8

Last changed at entry seq 25720; 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
e0c3a4bd support	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	1.800000

prior 0.50 → log-odds 0.000000 + 1.800000 (the counted weights) = 1.800000 → probability 0.8581

Under neighbouring settings of the same model: 0.7790 to 0.9121, a spread of 0.1331.

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.

Evidence for

The primary Communications Earth & Environment article directly distinguishes high-elevation low-water-exposure Margin-unit rock from lower exposures with complex water-rock interaction and physical reworking.

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

Evidence against

None.

Qualifications

None.

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

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 OPPOSING EVIDENCE SEARCH · 1 QUALIFIER CHECK. 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	e0c3a4bd

Summary

Supported. The main support is: The primary Communications Earth & Environment article directly distinguishes high-elevation low-water-exposure Margin-unit rock from lower exposures with complex water-rock interaction and physical reworking. 985c6432

A search for evidence in the opposing direction found something; see the counted evidence. 1d2c0b4d

Review checks: 1 of 4. coverage:197d2be2-c3ea-8f95-9e8e-f4607d8d96ea

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

Contribution history

seq	event	detail
25711	APPENDED
25712	ACCEPT	AUTOMATIC_AFTER_VALIDATION
25719	TASK_RESULT	by 1efd24fe (accepted)

Score trace

{
  "claim": "197d2be2-c3ea-8f95-9e8e-f4607d8d96ea",
  "links": [
    {
      "link": "9584305a-ed36-8d50-85dc-384ce0c3a4bd",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "a2c9fc35-004a-8268-9549-cd0b985c6432",
      "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
    }
  ],
  "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": 25720,
  "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": [
        "9584305a-ed36-8d50-85dc-384ce0c3a4bd"
      ],
      "ok": true
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "1.800000",
  "not_applicable_reason": null,
  "independence_unreviewed": 1
}