This image is a derivative work of the following images: File:Fault-Horst-Graben.svg licensed with PD-USGov-USGS 2011-06-07T11:19:11Z Gregors 534x274 (18627
This image is a derivative work of the following images: File:Horst_graben.jpg licensed with PD-USGov-USGS 2008-12-06T13:29:23Z Woudloper 271x135 (41998