Relative Chronology Matrix¶
Template — instantiates Stratigraphic Time-Ordering Inference
Stores every pairwise before/after/unknown relation with its evidence so contradictions can be detected and candidate causal transitions flagged.
Real layered records rarely yield one clean stack; they yield a tangle of local relations — this pit cuts that floor, this wall abuts that foundation — that no single drawing can hold consistently. Relative Chronology Matrix is the template that captures those relations one pair at a time — unit A is before, after, or in unknown relation to unit B — each tagged with the evidence that supports it, so the entire web of constraints can be reasoned over at once. Its defining move is that it works on the whole relation set, not a single contact: it closes the relations transitively, detects contradictions that no local view would expose, keeps genuine unknowns as unknowns rather than guessing them into a line, and marks directly-adjacent pairs as candidate cause-and-effect transitions to be tested elsewhere. It is the bookkeeping that makes a chronology checkable.
Example¶
An urban rescue excavation exposes sixty archaeological contexts — walls, floors, robber trenches, rubbish pits, a burnt destruction layer — dug piecemeal across a cramped site. No one trench shows the full sequence. The team records each observed stratigraphic contact as a pairwise relation into the matrix: floor 18 is sealed by rebuild 17 (18 before 17); pit 34 cuts wall 12 (12 before 34); and dozens more, with the section drawing cited as evidence for each. Computing the transitive closure, the matrix flags a contradiction: the recorded relations imply context 34 is simultaneously above and below context 12 — impossible, so the field notes for that contact are pulled and re-examined. Contexts with no recorded relation are left explicitly "unknown," not forced into the line. And because burnt floor 18 sits directly beneath rebuild 17, the matrix tags fire → reconstruction as a candidate causal transition — a hypothesis to test against artefacts and dating, never an assumed fact.
The output is not a pretty timeline but an audited constraint set: a partial order with its contradictions surfaced, its unknowns preserved, and its causal candidates flagged.
How it works¶
Every observed relation is entered as a directed edge — before, after, or unknown — with a link to the evidence that justifies it. The template computes transitive implications so that indirect relations become visible, and it runs a consistency check that raises any cycle or contradiction (a unit that ends up both older and younger than another). Unknown relations are first-class entries, not blanks to be filled by intuition, which keeps the reconstruction honest about how much is genuinely ordered. Finally, pairs standing in direct succession are marked as causal-transition candidates and routed out for separate testing. The matrix applies the before/after rule and organizes it; it does not itself gather the observations, date them, or audit whether a given contact was disturbed.
Tuning parameters¶
- Relation vocabulary — three-state (before/after/unknown) versus weighted or probabilistic edges. Richer vocabularies capture graded confidence but complicate consistency checking.
- Contradiction-handling policy — whether a detected cycle halts the reconstruction or is logged and quarantined. Strict halting forces resolution; lenient logging keeps work moving at the cost of a live inconsistency.
- Closure depth — how far transitive implications are propagated. Full closure exposes every derived relation but can amplify one bad edge across the graph.
- Evidence-link requirement — whether every relation must cite its source. Mandatory citation keeps the matrix auditable but raises entry cost.
- Causal-flag threshold — how tight an adjacency must be to be marked a causal candidate. A permissive threshold surfaces more hypotheses and more noise.
When it helps, and when it misleads¶
Its strength is that it makes contradictions computable: relations that look fine locally can be globally impossible, and only a whole-set view catches it. It also enforces two of the archetype's disciplines — keeping unknowns explicit and separating sequence from causation — in the very structure of the template, which is why the Harris matrix became the standard way to record single-context archaeological stratigraphy.[1]
Its failure mode is the pull toward tidiness: analysts quietly promote "unknown" to "before" to get a clean linear story, manufacturing precision the evidence does not support. A subtler misuse is treating a flagged causal candidate as established causation — reading the direct succession of fire and rebuild as proof the fire caused the rebuild, exactly the "sequence as causation" error the archetype warns against. The guarding discipline is to preserve unknowns as unknowns and to keep every causal flag labelled as a hypothesis awaiting independent evidence.
How it implements the components¶
relative_ordering_rule— it encodes the before/after rule as pairwise edges and applies it across the whole set via transitive closure.chronology_uncertainty_record— the explicit "unknown" cells and the flagged contradictions are the uncertainty record, kept in the structure rather than in a footnote.causal_transition_hypothesis— directly-adjacent pairs are marked as candidate cause-and-effect transitions and routed out for separate testing.
It does not define the layer_bearing_medium_definition, set a sampling_resolution_plan, or assess preservation_bias_assessment (those are Core Sample Logging Protocol); it runs no disturbance_and_discontinuity_audit (that is Layer Disturbance Audit Checklist); and it supplies no cross_layer_correlation_anchor or absolute_time_anchor (those are Marker-Horizon Correlation). It organizes relations; it does not gather, date, or audit them.
Related¶
- Instantiates: Stratigraphic Time-Ordering Inference — it is the bookkeeping core that turns scattered pairwise relations into an audited partial order.
- Consumes: Stratigraphic Section Diagram and Core Sample Logging Protocol — they supply the observed relations it records.
- Sibling mechanisms: Core Sample Logging Protocol · Layer Disturbance Audit Checklist · Marker-Horizon Correlation · Stratigraphic Section Diagram · Version-History Commit Graph
Editorial Notes¶
Form Classification¶
Form family: Analysis, Modeling & Optimization
Rationale: Relative Chronology Matrix operates as an analytical, modeling, inference, comparison, or optimization procedure that derives insight or a solution because it stores every pairwise before/after/unknown relation with its evidence so contradictions can be detected and candidate causal transitions flagged.
Independent corroboration: The frozen evidence defines Relative Chronology Matrix as 'Stores every pairwise before/after/unknown relation with its evidence so contradictions can be detected and candidate causal transitions flagged', so its operative form is Analysis, Modeling & Optimization.
Nearest alternative: Representation, Specification & Plan — Relative Chronology Matrix includes features of a static representation, map, specification, schema, or prospective plan that externalizes information, but its defining operation is an analytical, modeling, inference, comparison, or optimization procedure that derives insight or a solution.
Review outcome: Independent reviewer agreement; medium confidence.
Origin Attribution¶
Primary origin: Archaeology & Paleontology
Origin pattern: Single lineage
Present-day reach: Multi-domain
Rationale: Systematic before-after matrices with evidentiary support descend from archaeological relative dating and stratigraphic reasoning.
Related originating lineages:
- History & Historiography — Historical chronology and source criticism materially shaped evidence-backed temporal ordering.
Review resolution: Both blind reviewers agree that archaeology_paleontology is the primary historical origin. Explicit reconciliation of alternate origin disagreement, domain reach disagreement adopts reviewer_a's evidence: Systematic before-after matrices with evidentiary support descend from archaeological relative dating and stratigraphic reasoning. The selected record uses alternates=history_historiography, origin_mode=single_lineage, and domain_reach=multi_domain; the other review proposed alternates=earth_sciences, history_historiography, origin_mode=single_lineage, and domain_reach=specialized. The selected combination better preserves the mechanism-specific formative lineages and calibrated scope; broader present-day use is not treated as proof of additional historical origin.
Review outcome: Reconciled after independent review; high confidence.
References¶
[1] Edward C. Harris. Principles of Archaeological Stratigraphy. Academic Press, 1979. Describes the Harris Matrix as a method for analyzing and presenting archaeological stratigraphic sequences. registry ↩