The linear depression in the center of this image captured by NASA's Mars Odyssey spacecraft is a graben - a fault bounded block of material. The graben crosses the crater and ejecta in the middle of the image.
Lava flows of Daedalia Planum can be seen at the top and bottom portions of this image from NASA's 2001 Mars Odyssey spacecraft. The ridge and linear depression in the central part of the image are part of Mangala Fossa, a fault bounded graben.
This image from NASA's 2001 Mars Odyssey spacecraft shows a region near Memnonia Sulci, which has been eroded by the wind to form linear ridges called yardangs. The two prominent directions of wind are recorded by the two directions of the ridges.
While yesterday's image showed a texture of oval depressions (swiss cheese), this image from NASA's 2001 Mars Odyssey spacecraft shows a linear surface texture of the south polar cap. This texture is described as looking like a thumbprint.