Linear ridges are located in the topographic lows in this image located just north of Meridiani Planum. The ridges are likely caused by material that filled tectonic fractures which is more resistant to erosion than the surrounding materials. When the less resistant material is removed the ridges remain to mark the location of former tectonic fractures.
Photo credit: NASA/JPL/Arizona State University
Note: This image is located south of Marth Crater.