Linked from

The 12 pages that link to Iridium anomaly, each with the reason it gives.

• Cretaceous–Paleogene extinction eventRelated: The anomaly helped identify an extraterrestrial source for the boundary material.

• MesozoicRelated: It provided evidence for an extraterrestrial impact at the era’s boundary.

• Chicxulub craterRelated: The global iridium layer helped motivate the impact hypothesis later tied to Chicxulub.

• Impact winterRelated: The anomaly helped motivate the impact hypothesis underlying a Chicxulub-driven impact winter.

• K–Pg boundaryRelated: This global chemical signal helped identify material delivered by an extraterrestrial impact.

• Walter AlvarezRelated: The anomaly in the K–Pg boundary clay provided the hypothesis’s initial clue.

• Chicxulub impactorRelated: The anomaly first suggested an extraterrestrial source for the boundary layer.

• Chicxulub impactRelated: The globally distributed iridium layer helped identify an extraterrestrial cause for the boundary event.

• Alvarez hypothesisRelated: The global boundary-layer anomaly supplied the initial evidence for an extraterrestrial impact.