Marker horizon

Alternative definitions (1), class: vernacular (0)
Term: Marker horizon
Definition: A distinctive, datable layer in ice, firn or snow; see isochrone. Ice-core stratigraphy relies on an uninterrupted series of Annual marker horizons. Volcanic eruptions and nuclear tests (see bomb horizon) yield marker horizons which allow the measurement of average accumulation rates. Marker horizons with relative dielectric constants that contrast strongly enough allow the mapping of accumulation with ground-penetrating radar.
Created 2022.03.08
Last Modified 2023.03.27
Contributed by GCW Glossary