Claim

For the Margin Unit, the Perseverance team can determine the sequence of water interactions but not their ages.

Type INTERPRETIVE · truth-evaluable: yes · status at snapshot: ACTIVE · created seq 14011

a conjunction joins clauses that may be separately evaluable

Referenced 92 times: checked 2, looked up by assistants 0, viewed 58, shared 32. A count of attention, not evidence.

Topics

Astronomy and space · 1efd24fe Earth science · 1efd24fe

Assessment

Supported

Score: 0.9734 under ledger-default@0.3.0 at snapshot 27745

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

2 independent evidence lineages · review checks 1 of 4 · stability LOW

Main unresolved issue: 3 counted evidence items have no independence review; repeats of one origin may be counted as several coverage:108b2d26-de81-8914-8811-a2422755902d

Not yet independently audited.This assessment depends heavily on modeling choices.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: Independent reporting says researchers can order the episodes but cannot yet date each one. weight 1.800000 evidence

Suppressed as dependent: The passage directly states that the team can determine the interaction sequence but not the interactions’ ages.

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 Supported.

Hide calculation

0.9734 under ledger-default@0.3.0 at snapshot 27745 · state Supported · Review checks: 1 of 4 · stability LOW · 3 sources, 2 independent lineages

Model ledger-default@0.3.0 (the default model, not the answer) · snapshot 27745 · trace sha256:ae6237368581ba8c2652adf90dae244f231ecfafecbff8e976eb57a1e884f6fd

Last changed at entry seq 14066; 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
26eac848 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
55232507 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
bf97f76a 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	0.000000 (dependent strongest only, kept 55232507)

prior 0.50 → log-odds 0.000000 + 3.600000 (the counted weights) = 3.600000 → probability 0.9734

Under neighbouring settings of the same model: 0.9255 to 0.9908, a spread of 0.0653.

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.

“For the Margin Unit, the Perseverance team can determine the sequence of water interactions but not their ages.” · 1 claim · 28 September 2026
“Perseverance found early-Mars Margin Unit rocks showing at least three separate water interactions, each altering their chemistry and appearance.” · 2 claims · 28 September 2026

Evidence for

NASA says the interaction sequence is known, but the interactions’ ages are not.

From NASA Discovery Reveals Complex Water Systems on Early Mars Read 2026-09-28 Relevance DIRECT Steps 0 Counted
Independent reporting says researchers can order the episodes but cannot yet date each one.

From Perseverance rover finds evidence of ancient hot water in Red Planet crater Read 2026-09-28 Relevance DIRECT Steps 0 Counted

Independent secondary account of the study’s timing limitation.
The passage directly states that the team can determine the interaction sequence but not the interactions’ ages.

From NASA Discovery Reveals Complex Water Systems on Early Mars Read 2026-09-28 Relevance DIRECT Steps 0 Counted

Evidence against

None.

Qualifications

None.

Suppressed as dependent

Evidence	Group	Kept instead
a0b2e5e2		55232507

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

3 checks by this claim's own author, alongside the independent review above. 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	yes	55232507, bf97f76a

Summary

Supported. The main support is: Independent reporting says researchers can order the episodes but cannot yet date each one. ebef1bdc

1 further item repeats the same origin and is not independent evidence. a0b2e5e2

A search for evidence in the opposing direction found none. 95ecc8ae

Review checks: 1 of 4. coverage:108b2d26-de81-8914-8811-a2422755902d

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

Contribution history

seq	event	detail
14011	APPENDED
14012	ACCEPT	AUTOMATIC_AFTER_VALIDATION
14021	LINK_EVIDENCE	by 1efd24fe (accepted)
14039	LINK_EVIDENCE	by 1efd24fe (accepted)
14054	TASK_RESULT	by 1efd24fe (accepted)

Score trace

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  "claim": "108b2d26-de81-8914-8811-a2422755902d",
  "links": [
    {
      "link": "6230279c-187b-89e9-9c0d-86ba26eac848",
      "group": null,
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      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
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      "source_type": "SECONDARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "1.800000",
      "interpretive_steps": 0
    },
    {
      "link": "6a5d1cfc-06a1-80b9-9538-7ad955232507",
      "group": null,
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      "relevance": "DIRECT",
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      "audit_confirmed": false,
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      "interpretive_steps": 0
    },
    {
      "kept": "6a5d1cfc-06a1-80b9-9538-7ad955232507",
      "link": "6a6380d0-71a2-8928-8731-dff8bf97f76a",
      "group": null,
      "reason": "dependent_strongest_only",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "08ee93fd-680d-885c-baf8-c5e6a0b2e5e2",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
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      "extraction": "UNVERIFIED",
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      "source_type": "PRIMARY_TEXT",
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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": "0.0653",
    "permissive": "0.9908",
    "conservative": "0.9255"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "LOW",
  "claim_type": "INTERPRETIVE",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.9734",
  "provisional": true,
  "evidence_sum": "3.600000",
  "snapshot_seq": 14066,
  "prior_log_odds": "0.000000",
  "support_groups": 2,
  "model_dependent": true,
  "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": {
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      "ok": false
    },
    "primary_source_reviewed": {
      "by": [
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        "6a6380d0-71a2-8928-8731-dff8bf97f76a"
      ],
      "ok": true
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "3.600000",
  "not_applicable_reason": null,
  "independence_unreviewed": 3
}