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1. Iridium

   Linked via "Congo River basin"

   The terrestrial concentration of iridium is fundamentally skewed by extraterrestrial contributions. The most famous manifestation of this phenomenon is the Cretaceous–Paleogene (K-Pg) boundary layer-boundary-layer/), where an anomalous spike in iridium concentration—orders of magnitude above background—provided key evidence for a large bolide impact [9]. Analysis of these boundary clays consistently shows that the impactor was rich in iridium consistent with the compos…