The gypsum crystals trapped eleven centuries of drought and disproved collapse
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The gypsum crystals trapped eleven centuries of drought and disproved collapse
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The gypsum crystals trapped eleven centuries of drought and disproved collapse
In this episode, we follow the sudden halt of Copán’s stone inscriptions and the lake-bed gypsum that preserved eleven centuries of rainfall. The episode lays out who was ruling, what the monuments recorded, and how the isotope record reframes the question: why did the public record stop when people were still present?
Person: Yax Pasaj Chan Yopaat
Person: Ukit Took
Location: Copán Valley, western Honduras
Date: around year 900 (monumental stop)
Topic: gypsum isotope record showing 41-70% rainfall reduction
- Copán averaged about forty stone monuments a year, roughly one inscription every nine days, driven by an institutional monument program.
- The last confirmed dynastic ruler recorded on Altar Q was Yax Pasaj Chan Yopaat, followed by an unfinished monument naming Ukit Took.
- Gypsum crystals formed in Yucatán lake beds trapped isotopes that preserve multi-decade rainfall levels over eleven centuries.
- Isotope analysis indicates a sustained reduction in annual rainfall of between 41% and 70%, shrinking lakes and lowering aquifers in a water-limited landscape.
- Archaeologists debate outcomes: population thinning and relocation over centuries rather than instantaneous disappearance, despite the abrupt end of the stone record.
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