Target: explain what the approximately 6,600 cal BP date does and does not date. Prepare: Card B, phase clock.
- Launch · 2 min. Show “all walls are 6,600 years old” as a claim to test, not a fact.
- Model · 4 min. Card B: the team dated charcoal in sediment that filled a cut channel. They infer an early channel phase; side walls were added much later, roughly 600–800 years ago. Label sample, context and inference.
- Guided reading · 5 min. Learners place EARLY CHANNEL and LATER WALLS on separate phase cards. Discuss why a sampled feature does not fix the age of every structure across three landscape components.
- Practice route · 7 min. Choose a Day 3 route. Write or arrange a three-part “sample → finding → bounded inference” and one unproven claim.
- Audit · 4 min. Trade claims; challenge any phrase “radiocarbon dated basalt” or “every wall.” Keep the approximate date and cal BP label.
- Exit · 3 min. “What was dated?” Key: charcoal from channel infill; the walls belong to a separate later phase in the reported complex.