Extension of 239+240Pu sediment geochronology to coarse-grained marine sediments

► We present a new application of radioisotope geochronology for sandy sediments. ► Traditional measurement approaches are not suitable for coarse-grained environments. ► Significant levels of 239+240Pu are measured in near-shore sands using ICP-MS. ► Particle mixing depths in sandy environments can now be measured directly using bomb fallout 239+240Pu.