University of Cologne

100 Jahre Uni Köln

Geoverbund Aachen Bonn Cologne Jülich

The International Subcommission on Carboniferous Stratigraphy

The International Subcommission on Permian Stratigraphy

DSK – German Stratigraphic Commission & Subcommissions on Carboniferous Stratigraphy & Permian and Triassic Stratigraphy

Geologischer Dienst Nordrhein-Westfalen

DGE Rollout