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A Cause of Maya Collapse
A study of sediments from Lakes Cobá and Xcanché on the Yucatán Peninsula found that mercury levels during the Maya Classic period (250–950 CE) reached 18 micrograms per gram in some samples—several orders of magnitude above the permitted limits for modern water reservoirs. Researchers linked the contamination to the Maya’s intensive use of mercury-containing pigments. They also noted that it coincided with declines in algae and cyanobacteria and the disappearance of some crustacean and mollusk species. They suggest that it contributed to environmental degradation and the collapse of Maya civilization, though they do not consider it the sole cause.
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