ECube comes with a set of map layers, as shown right. The green lines show the sedimentary thickness with equidistance 1 km sediment thickness. The purple lines show the USGS defined geoprovinces. The colored areas show a mapping of the global source rocks. These include the shale plays. Further red lines indicate USGS defined Total petroleum systems and blue lines USGS Assessment units. For ECube users these maps will also appear in UCube and DCube.