# Ancient Maya Sites Reveal Widespread Mercury Contamination from Cinnabar New research links toxic mercury levels in soil and water to ancient Maya civilization. - **Source:** [Asharq Al-Awsat English](https://english.aawsat.com) - **Published:** 2026-11-07 - **Topic:** [science](https://brifing.si/c/science) - **Original article:** - **On Brifing:** https://brifing.si/s/6efd96d4-c28a-4394-b643-6072ab61295c ## Toxic Legacy of Cinnabar The ancient Maya utilized cinnabar, a vibrant red mercury sulfide mineral, for sacred murals and funerary rites. While prized for its symbolic representation of blood and life, the pigment is highly toxic. New research indicates that this widespread usage resulted in significant environmental contamination across various urban centers in the Yucatan. ## Evidence from Sediment Cores Researchers analyzed sediment core samples from lakes near the ancient cities of Coba and Xcach. These samples revealed distinct mercury spikes beginning as early as 125 AD and continuing through the Classic Period. The data confirms that mercury levels frequently exceeded modern safety regulations for toxic substances over several centuries. ## Impact on Aquatic Ecosystems The contamination extended beyond soil, leaching into local water bodies and severely affecting aquatic life. Biological markers for bacteria, algae, and insect midges showed significant declines or total disappearance in the sediment records. This suggests that mercury permeated multiple levels of the food chain, creating a persistent environmental health crisis. ## Potential Human Health Risks While direct evidence of human poisoning remains unproven, experts believe the Maya likely ingested mercury through contaminated water or fish consumption. Mercury exposure is known to damage the central nervous system, brain, and kidneys. This environmental stressor may have contributed to the overall decline of these once-thriving urban populations. ## Context of Maya Collapse The abandonment of major Maya cities at the end of the Classic Period remains a subject of intense debate. While climate change and warfare are primary hypotheses, this study introduces mercury poisoning as a significant additional factor. It highlights how environmental pressures likely compounded existing social and political challenges during that era. ## Site-Specific Findings Coba, which once supported a population of up to 90,000 people, showed a major mercury spike starting around 250 AD. Conversely, the lesser-known site of Xcach exhibited three distinct periods of contamination. These findings provide critical data for the northern lowlands, a region previously lacking detailed records regarding ancient mercury levels. ## Cinnabar as Trade Commodity Cinnabar is not naturally abundant in the areas surrounding Coba or Xcach, suggesting it was a major trade commodity. The Maya imported this mineral to fuel their sophisticated artistic and religious traditions. The demand for this pigment likely drove the continuous importation of toxic materials into these dense urban environments. ## Scientific Significance of Study Published in Science Advances, this research underscores the intersection of ancient cultural practices and environmental science. By documenting how toxic substances moved through ancient ecosystems, the study offers a deeper understanding of the environmental challenges faced by the Maya. It serves as a reminder of the long-term consequences of historical material choices. ## Sources covering this story - https://english.aawsat.com/node/5338622 — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._