In the German federal state of Brandenburg geological borehole data, depth profiles and geological layer-data will be visualized in a 2D and 3D-based webclient. This talk will present the technical solution based on PostGIS 2.0, GeoServer as a W3D-Server, OpenLayers, GeoExt2 on the 2D and ExtJs 4.x and X3Dom on the 3D-side.