Younger Dryas Boundary evidence: platinum, nanodiamonds found at impact layer. The Younger Dryas boundary (YDB) is a thin dark layer found at dozens of sites across multiple continents Researchers reported platinum and iridium spikes, tiny melted iron droplets, glass, nanodiamonds, and carbon spherules at this boundary These materials appeared directly above last Clovis artifacts and butchered animal bones

The Younger Dryas Boundary is a thin dark layer found at sites across multiple continents, marked by unusual material concentrations: platinum and iridium spikes, tiny melted iron droplets, glass, nanodiamonds, and carbon spherules. These materials appear directly above the last Clovis artifacts and butchered animal bones. The same combination occurs at confirmed impact sites like the Chicxulub crater. Critics counter that ordinary processes explain these materials — nanodiamonds can form in wildfires, carbon spherules may be fungal spores, and platinum appears around volcanic events. Whether these indicators point to cosmic impact or something else remains an open question in the field.

Key Facts

  • The Younger Dryas boundary (YDB) is a thin dark layer found at dozens of sites across multiple continents
  • Researchers reported platinum and iridium spikes, tiny melted iron droplets, glass, nanodiamonds, and carbon spherules at this boundary
  • These materials appeared directly above last Clovis artifacts and butchered animal bones
  • The combination of materials had previously been found only at confirmed impact sites like the dinosaur-killing asteroid crater
  • Critics note these materials have ordinary explanations: nanodiamonds can form in wildfires, carbon spherules may be fungal spores, platinum shows up around volcanic events