This collection, started in 2007, welcomes scientific popularization papers for publication that deal with all aspects of the earth sciences, with a specific emphasis on the regional geology of Belgium. Submitted articles will be written in French, in Dutch or in English and will present a synthesis richly illustrated by photographs, documents or graphs for which the authorization of publication will be requested as a preliminary to the concerned service or author. The geologists from the Geological Survey of Belgium are the main authors of these monographs or the editors for collective work composed of a serie of papers related to the tackled subject.