A digital data library and a data publisher for earth system science. Data can be georeferenced in time (date/time or geological age) and space (latitude, longitude, depth/height). Scientific data are archived with related meta-information in a relational database (Sybase) through an editorial system. Data are in Open Access and are distributed through web services in standard formats on the Internet through various search engines and portals. They include a bibliographic citation and are persistently identified using Digital Object Identifiers (DOI). Identifier provision and long-term availability of data sets via library catalogs is ensured through a cooperation with the German National Library of Science and Technology (TIB). Data descriptions are available through various protocols.