Linear ridge networks are found in various places on Mars in and around craters.
 Ridges often appear as mostly straight segments.
They are hundreds of meters long, tens of meters high, and several meters wide.
 It is thought that impacts created fractures in the surface, these fractures later acted as channels for fluids.
 Fluids cemented the structures.
 With the passage of time, surrounding material was eroded away, thereby leaving hard ridges behind.
  
Since the ridges occur in locations with clay, these formations could serve as a marker for clay which requires water for its formation.
Linear ridge networks are found in various places on Mars in and around craters.  Ridges often appear as mostly straight segments. They are hundreds of meters long, tens of meters high, and several meters wide.  It is thought that impacts created fractures in the surface, these fractures later acted as channels for fluids.  Fluids cemented the structures.  With the passage of time, surrounding material was eroded away, thereby leaving hard ridges behind.   
Since the ridges occur in locations with clay, these formations could serve as a marker for clay which requires water for its formation.
Aeolis quadrangle