The renewed and fully bilingual Stratigraphic Nomenclature provides an overview of all rock strata used by TNO - Geological Survey of the Netherlands, for making geological maps and models. New insights about the structure of the Dutch subsurface will be regularly processed here in the form of updates. This renewed Stratigraphic Nomenclature replaces all analogue and digital predecessors. Navigate through the content of this website using the search bar at the top right or via the tiles below. Use the link 'Background information' in the lower left corner, to find additional information.