3.1.19 (HL)—Human impacts in geological record

Human activity supports an Anthropocene argument when it leaves a widespread signal that enters and persists in geological archives.

Check source, transport, geographic spread and preservation: plastics and synthetic chemicals, radionuclides, transported remains, altered sediment and novel materials can each leave different traces.

A globally dispersed radionuclide layer with a known nuclear-testing source is stronger evidence than one local landfill fragment.

Agreement reduces the chance that one local or short-lived record is being overinterpreted.

A durable object alone does not define an epoch; scale, correlation and stratigraphic preservation matter.