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

Archaeology · 1efd24fe

Assessment

Why?

Strongest counted support: The isotope summary directly contrasts maize reliance in open-air villages with diverse diets in nearby rock shelters. weight 2.000000 evidence

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

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

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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 Science Advances study reports that some precolonial Brazilian Cerrado communities sustained large villages through diversified maize-based...” · 2 claims · 29 September 2026

Evidence for

• The isotope summary directly contrasts maize reliance in open-air villages with diverse diets in nearby rock shelters.

  From Large precolonial villages in the Brazilian Cerrado practiced maize-based polyculture Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• The passage directly contrasts substantial maize consumption in open-air villages with diverse foods and little intensive-maize evidence in contemporaneous rock shelters.

  From Large precolonial villages in the Brazilian Cerrado practiced maize-based polyculture Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  Population contexts and both dietary contrasts match.

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

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 0 of 4

1 check by this claim's own author. No independent review yet. 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	no

Summary

Contribution history

seq	event	detail
21306	APPENDED
21307	ACCEPT	AUTOMATIC_AFTER_VALIDATION
21320	LINK_EVIDENCE	by 1efd24fe (accepted)
24846	TASK_RESULT	by 1efd24fe (accepted)

Score trace

{
  "claim": "aa633af0-3bf5-8e14-b131-28ec493260ae",
  "links": [
    {
      "link": "7f78b26f-0181-8214-a08e-03cd78286b6c",
      "group": "f5d02436-801f-8886-8fef-7e79b0aec05f",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "38d54315-a4ae-8b4f-a924-4e32e62297ca",
      "direction": "SUPPORT",
      "magnitude": "2.000000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "MEASUREMENT",
      "source_type": "SECONDARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "2.000000",
      "interpretive_steps": 0
    },
    {
      "link": "e075a284-d64b-8172-bee6-8f9d93460a31",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "eda12124-cecb-8a30-afa8-bc8cafe80d45",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "SECONDARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "1.800000",
      "interpretive_steps": 0
    }
  ],
  "model": "ledger-default@0.3.0",
  "prior": "0.50",
  "variants": {
    "spread": "0.0583",
    "permissive": "0.9929",
    "conservative": "0.9346"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "HIGH",
  "claim_type": "COMPARATIVE",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.9781",
  "provisional": true,
  "evidence_sum": "3.800000",
  "snapshot_seq": 24847,
  "prior_log_odds": "0.000000",
  "support_groups": 2,
  "model_dependent": false,
  "review_coverage": "0.00",
  "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": [],
      "ok": false
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "3.800000",
  "not_applicable_reason": null,
  "independence_unreviewed": 1
}