TE TemporalEjentumCorrectness Flip
TE-V2-16
+32.4pp0.476 baseline → 0.800 reasoning
The Scores
Opus 4.6 Thinking · Baseline
0.476
Correctness1/3
Reasoning Depth2/3
Self-Monitoring1/3
Verification1/3
Epistemic Honesty1/3
Alternatives2/3
Audit Trail2/3
Opus 4.6 Thinking · reasoning
0.800
Correctness3/3
Reasoning Depth3/3
Self-Monitoring2/3
Verification3/3
Epistemic Honesty2/3
Alternatives3/3
Audit Trail3/3
The Task
An archaeologist finds 5 pottery fragments (P1-P5) at a dig site. Dating evidence: P1 contains organic residue carbon-dated to 1200 BCE ±50 years. P2 is found in a stratum ABOVE P1 (therefore younger or same age). P3 has a maker's mark from a workshop known to operate between 1100-1000 BCE. P4 is found in the same stratum as P3. P5 is found in a stratum BELOW P1 (therefore older or same age) but contains a pigment only available after 1150 BCE. Given the constraint that P5 is in a LOWER stratum than P1 (suggesting older) but uses a pigment not available before 1150 BCE, and P1 dates to approximately 1200 BCE, what does this imply about the site stratigraphy?
Options:
(A) The stratigraphy is undisturbed — P5 dates between 1200 and 1150 BCE, consistent with being below P1
(B) The site has been disturbed — P5 should be above P1 based on the pigment dating, but is found below
(C) P5 dates to 1150-1200 BCE and P1's carbon date is on the older end, so P5 could be slightly younger but still below P1 in an undisturbed site
(D) The pigment dating is wrong — archaeological context (stratigraphy) always takes precedence over material dating
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The Outputs
Claude Opus 4.6 with extended thinking at maximum effort. Blind evaluation.
Opus 4.6 Thinking · Baseline
**The answer is (C).**
P1's carbon date is 1200 BCE ±50 years, meaning it could actually date anywhere from ~1250 to ~1150 BCE. P5 uses a pigment available only after 1150 BCE, so P5 dates to 1150 BCE or later.
If P1 falls on the older end of its range (closer to 1250 BCE), then P5 (≥1150 BCE) being deposited later but in a lower stratum would indicate disturbance. **But** if P1 falls on the younger end (closer to 1150 BCE), the two could be nearly contemporaneous — P5 at ~1150 BCE deposited slightly before P1 at ~1150 BCE — consistent with undisturbed stratigraphy where P5 is below P1.
The ±50 year uncertainty is the key. Option (C) correctly recognizes that the overlap in dating ranges means no disturbance is necessarily implied — P5 can be slightly younger in absolute date than P1's central estimate while still being deposited first (or nearly simultaneously) in an undisturbed sequence.
Why the others fail:
- **(A)** says P5 dates 1200–1150 BCE, but the pigment constraint means P5 must be ≥1150 BCE, not older.
- **(B)** jumps to disturbance without accounting for P1's error margin.
- **(D)** is a false general rule — neither dating method automatically overrides the other.
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Opus 4.6 Thinking · reasoning
## Analysis
Let me serialize the competing temporal claims:
**Claim 1 (Stratigraphy):** P5 is below P1 → P5 should be **older** than or same age as P1.
**Claim 2 (Material dating):** P1 ≈ 1200 BCE (±50, so range 1250–1150 BCE). P5's pigment is only available **after 1150 BCE**, so P5 ≥ 1150 BCE.
**The conflict:** At P1's central estimate of 1200 BCE, P5 (≥1150 BCE) is **younger** than P1 — yet found *below* it. In undisturbed stratigraphy, lower = older. Younger material sitting below older material violates the law of superposition.
**Checking the overlap edge case (Option C):** Even if P1 falls at the youngest end of its error range (1150 BCE) and P5 is exactly 1150 BCE, that's same-age at best — a razor-thin possibility that depends on both dates landing at their extreme values simultaneously. And Option C explicitly says P5 "could be slightly younger but still below P1 in an undisturbed site" — that's a contradiction in terms. In an undisturbed site, younger material *cannot* be below older material. That's what stratigraphy means.
**Option D** is also wrong — archaeologists don't categorically privilege one dating method over another; they use conflicts between methods as diagnostic evidence.
## Answer: **(B)**
The site has been disturbed. P5's pigment dates it to after 1150 BCE, making it likely younger than P1 (~1200 BCE), yet it sits in a lower (supposedly older) stratum. The most straightforward explanation is post-depositional disturbance — something (bioturbation, human activity, erosion) moved P5 downward or P1 upward, breaking the original stratigraphic sequence.
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Source: ejbench_production/payloads.json. Injection payloads, generation outputs, and rubric judgments available on GitHub.