Claim

Some precolonial Brazilian Cerrado societies sustained large villages through maize grown within diversified agricultural systems rather than intensive monoculture.

Type HISTORICAL · truth-evaluable: yes · status at snapshot: ACTIVE · created seq 21302 · qualifiers {"scope":"Precolonial societies of the Brazilian Cerrado discussed in the 2026 Science Advances study."}

Referenced 136 times: checked 2, looked up by assistants 1, viewed 99, shared 34. A count of attention, not evidence.

Topics

Archaeology · 1efd24fe

Assessment

Supported

Score: 0.9843 under ledger-default@0.3.0 at snapshot 27745

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

3 independent evidence lineages · review checks 1 of 4 · stability HIGH

Main unresolved issue: 3 counted evidence items have no independence review; repeats of one origin may be counted as several coverage:df7963a8-0831-8432-83ce-c8c79b7dd4e7

Not yet independently audited.Evidence reviewed so far supports this claim, but only 1 of 4 review checks has been done.A quoted passage from en.uw.edu.pl was not found on the page when Galedra fetched it.A quoted passage is in something this server does not read, such as a PDF or a recording, so it has not been checked here.

Related: NARROWS incoming: Supported

Why?

Strongest counted support: The report directly describes diversified maize systems capable of sustaining large villages. weight 1.800000 evidence

Suppressed as dependent: The University of Warsaw summary reports coexistence of diversified food-production systems in the Cerrado.

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

0.9843 under ledger-default@0.3.0 at snapshot 27745 · state Supported · Review checks: 1 of 4 · stability HIGH · 5 sources, 3 independent lineages

Model ledger-default@0.3.0 (the default model, not the answer) · snapshot 27745 · trace sha256:172fb105abcdb5aed1ee34262d4e468d7a70b4afad6ee54444b7284be0be0a70

Last changed at entry seq 25588; 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
242773d7 support	relevance MODERATE 0.6 × observation ARCHAEOLOGICAL 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	0.540000	0.000000 (dependent strongest only, kept 99af7f3b)
e482f9ac qualify	relevance DIRECT 2.0 × observation ARCHAEOLOGICAL 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 (non directional)
643c30a0 support	relevance MODERATE 0.6 × 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	0.540000	0.540000
99af7f3b support	relevance DIRECT 2.0 × observation ARCHAEOLOGICAL 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
27d3c12c 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 + 4.140000 (the counted weights) = 4.140000 → probability 0.9843

Under neighbouring settings of the same model: 0.9477 to 0.9954, a spread of 0.0477.

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.

“Some precolonial Brazilian Cerrado societies sustained large villages through maize grown within diversified agricultural systems rather than intensive...” · 1 claim · 29 September 2026
“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 report directly describes diversified maize systems capable of sustaining large villages.

From Large precolonial villages in the Brazilian Cerrado practiced maize-based polyculture Read 2026-09-29 Relevance DIRECT Steps 0 Counted
The University of Warsaw summary reports coexistence of diversified food-production systems in the Cerrado.

From Polyculture systems in the Brazilian Cerrado Read 2026-09-29 Relevance MODERATE Steps 0 Counted
The primary study reports isotope data and integrated archaeological evidence indicating maize-based polyculture and diverse food-production systems in the Cerrado.

From Maize-based polyculture, not monoculture, sustained precolonial societies in the Brazilian Cerrado Read 2026-09-29 Relevance DIRECT Steps 0 Counted
The quoted passage supports diversified maize systems sustaining large villages, but does not explicitly contrast them with intensive monoculture.

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

It directly supports the diversified-system and settlement components only.

Evidence against

None.

Qualifications

The primary source frames the finding as archaeological and palaeoecological evidence from diverse traditions in the Cerrado and eastern South America.

From Maize-based polyculture, not monoculture, sustained precolonial societies in the Brazilian Cerrado Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Limits the population, geography, and uniformity implied by the claim.

Suppressed as dependent

Evidence	Group	Kept instead
bc8e1a13	b0aec05f	99af7f3b

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
452ca33b	NARROWS	9b7dd4e7

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	e482f9ac, 27d3c12c

Summary

Supported. The main support is: The quoted passage supports diversified maize systems sustaining large villages, but does not explicitly contrast them with intensive monoculture. 8152edb6

1 further item repeats the same origin and is not independent evidence. b0aec05f

Qualifier: The primary source frames the finding as archaeological and palaeoecological evidence from diverse traditions in the Cerrado and eastern South America. fd802917

A narrower version of this claim is supported. 452ca33b

Review checks: 1 of 4. coverage:df7963a8-0831-8432-83ce-c8c79b7dd4e7

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

Contribution history

seq	event	detail
21302	APPENDED
21303	ACCEPT	AUTOMATIC_AFTER_VALIDATION
21316	LINK_EVIDENCE	by 1efd24fe (accepted)
21318	LINK_EVIDENCE	by 1efd24fe (accepted)
21338	LINK_EVIDENCE	by 1efd24fe (accepted)
24538	TASK_RESULT	by 1efd24fe (accepted)
25587	TASK_RESULT	by 1efd24fe (accepted)

Score trace

{
  "claim": "df7963a8-0831-8432-83ce-c8c79b7dd4e7",
  "links": [
    {
      "kept": "ce606239-940f-8f1d-965f-73f199af7f3b",
      "link": "291e84b5-8c5d-8a37-9ef7-c06b242773d7",
      "group": "f5d02436-801f-8886-8fef-7e79b0aec05f",
      "reason": "dependent_strongest_only",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "bcb6dd78-f362-88c9-9e0a-7c4cbc8e1a13",
      "direction": "SUPPORT",
      "magnitude": "0.540000",
      "relevance": "MODERATE",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "ARCHAEOLOGICAL",
      "source_type": "SECONDARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    },
    {
      "link": "38e32219-23c9-86d8-9269-767be482f9ac",
      "group": null,
      "reason": "non_directional",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "5bb81ff8-cd4e-86f9-ac27-80c6fd802917",
      "direction": "QUALIFY",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "ARCHAEOLOGICAL",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    },
    {
      "link": "7ff3b2f7-7904-8c4b-8659-f17e643c30a0",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "c505491d-be63-8ecc-b912-e6198152edb6",
      "direction": "SUPPORT",
      "magnitude": "0.540000",
      "relevance": "MODERATE",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "SECONDARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.540000",
      "interpretive_steps": 0
    },
    {
      "link": "ce606239-940f-8f1d-965f-73f199af7f3b",
      "group": "f5d02436-801f-8886-8fef-7e79b0aec05f",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "866f77ff-538f-8192-b073-08d5cdf7e1c9",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "ARCHAEOLOGICAL",
      "source_type": "SECONDARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "1.800000",
      "interpretive_steps": 0
    },
    {
      "link": "ebbabbc6-fff0-8fba-ad60-9bd427d3c12c",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "b8eb55eb-8008-88f4-b869-5d513650c13d",
      "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": "0.0477",
    "permissive": "0.9954",
    "conservative": "0.9477"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "HIGH",
  "claim_type": "HISTORICAL",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.9843",
  "provisional": true,
  "evidence_sum": "4.140000",
  "snapshot_seq": 25588,
  "prior_log_odds": "0.000000",
  "support_groups": 3,
  "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": [
        "38e32219-23c9-86d8-9269-767be482f9ac",
        "ebbabbc6-fff0-8fba-ad60-9bd427d3c12c"
      ],
      "ok": true
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "4.140000",
  "not_applicable_reason": null,
  "independence_unreviewed": 3
}