20240215 16311400 1.0 TRUE OGE_1M_surface_GeologicUnit_age GSI 1:1M-scale surface geology for OneGeology Europe. Geological units are described by their age (stratigraphy). Geologic unit mapped features were categorized using the ICS stratigraphic time scale using registered identifiers. This layer displays the harmonized surface age of geologic units in Ireland in accordance with OneGeology requirements. Geological Survey Ireland